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{{otheruses4|the Fleischmann-Pons claims|accepted examples of fusion at temperatures below the millions of degrees Celsius required for ] fusion|nuclear fusion|a specific example of an accepted mechanism for low-temperature fusion, sometimes referred to as cold fusion|muon-catalyzed fusion|all other definitions|cold fusion (disambiguation)}}
{{two other uses|a contested field of scientific research|the computer programming language|ColdFusion|the ''Doctor Who'' novel|Cold Fusion (Doctor Who)}}
] (2005)]]
] used at the New Hydrogen Energy Institute in Japan.]]
'''Cold fusion''', sometimes called '''low energy nuclear reactions''' (LENR) or '''condensed matter nuclear science''', is a set of effects reported in controversial laboratory experiments at ordinary temperatures and pressures; some researchers claim these effects are caused by ]s.
'''Cold fusion''' (sometimes referred to as '''low energy nuclear reaction''' (LENR) studies or '''condensed matter nuclear science'''<ref>{{harvnb|Biberian|2007}},{{harvnb|Hagelstein et al.|2004|Ref=DOE2004}}</ref>) refers to a postulated ] process of unknown mechanism offered to explain a group of disputed experimental results first reported by electrochemists ] and ].


In 1989, ] and ] reported producing a tabletop nuclear fusion reaction at the University of Utah.<ref name="FleischmannPons_1989_301">{{harvnb|Fleischmann|Pons|1989|p=301}}.</ref> In their press conferences and papers, they reported the observation of anomalous heating ("excess heat") of an electrolytic cell during ] of ] using ] (Pd) electrodes. Lacking an explanation for the source of such heat, they proposed the ] that the heat came from ] of ] (D). The report of their results raised hopes of a cheap and abundant source of energy.<ref name="Browne_1989_para1">{{harvnb|Browne|1989|loc=para. 1}}.</ref> Cold fusion, under this definition, was only first announced on March 23, 1989 when Fleischmann and Pons reported producing nuclear fusion in a tabletop experiment involving ] of ] on a ] (Pd) electrode.<ref>{{harvnb|Voss|1999|Ref=Voss1999}}</ref> They reported anomalous heat production ("excess heat") of a magnitude they asserted would defy explanation except in terms of nuclear processes.<ref>{{harvnb|Fleischmann|Pons|1989|p=301}} ("It is inconceivable that this could be due to anything but nuclear processes.")</ref> They further reported measuring small amounts of nuclear reaction byproducts, including ] and ].<ref>{{harvnb|Fleischmann|Pons|1989|p=301}} ("We realise that the results reported here raise more questions than they provide answers . . .")</ref> These reports raised hopes of a cheap and abundant source of energy.<ref name="Browne_1989_para1"> {{harvnb|Browne|1989|loc=para. 1}}</ref>
Enthusiasm turned to skepticism as replication failures were weighed in view of several ] cold fusion should not be possible, the discovery of possible sources of experimental error, and finally the discovery that Fleischmann and Pons had not actually detected nuclear reaction byproducts.<ref>{{harvnb|Browne|1989}},{{harvnb|Close|1992}}, {{harvnb|Huizenga|1993}},{{harvnb|Taubes|1993}}</ref> By late 1989, most physicists considered cold fusion claims dead,<ref name="nytdebunk" /> and cold fusion subsequently gained a reputation as ].<ref name="nytdoe">{{cite web |url=http://query.nytimes.com/gst/fullpage.html?res=9C01E0DC1530F936A15750C0A9629C8B63 |title=US will give cold fusion a second look|accessdate=2009-02-08 |work= |publisher=New York Times|date= }}</ref> However, some researchers continue to investigate cold fusion and publish their findings at conferences, in books, and scientific journals.<ref name="nytdebunk">
{{cite news
| work = ]
| title = Physicists Debunk Claim Of a New Kind of Fusion
| author = Malcolm W. Browne
| date = 1989-05-03
| pages = A1, A22
| url = http://query.nytimes.com/gst/fullpage.html?res=950DE2D71539F930A35756C0A96F948260&pagewanted=all
}}</ref><ref>{{harvnb|Voss|1999|Ref=Voss1999}},{{harvnb|Platt|1998}},{{harvnb|Goodstein|1994}},{{harvnb|Van Noorden|2007}},{{harvnb|Beaudette|2002}},{{harvnb|Feder|2005}},{{harvnb|Hutchinson|2006}},{{harvnb|Kruglinksi|2006}},{{harvnb|Adam|2005}}</ref><ref name="nytscorn">
{{cite news
| work = ]
| title = Despite Scorn, Team in Utah Still Seeks Cold-Fusion Clues
| author = William J. Broad
| date = 1989-10-31
| url = http://query.nytimes.com/gst/fullpage.html?res=950DE6DA1331F932A05753C1A96F948260&pagewanted=all
| pages = C1
}}</ref>


There have been few mainstream reviews of the field since 1990. In 1989, the majority of a review panel organized by the ] (DOE) had found that the evidence for the discovery of a new nuclear process was not persuasive. A second DOE review, convened in 2004 to look at new research, reached conclusions that were similar to those of the 1989 panel.<ref>{{harvnb|Choi|2005}},{{harvnb|Feder|2005}},{{harvnb|US DOE|2004|Ref=DOE2004r}}</ref>
Cold fusion gained a reputation as ] after other scientists failed to replicate the results.<ref name="Browne_1989_para29">{{harvnb|Browne|1989|loc=para. 29}}.</ref> A review panel organized by the ] (DOE) in 1989 did not find the evidence persuasive. Since then, other reports of anomalous heat production and anomalous ] production have been reported in ] journals{{Ref_label|heat_tritium_reports|α|none}} and have been discussed at scientific conferences.<ref>{{harvnb|Van Noorden|2007|loc=para. 2}}.</ref><ref>{{harvnb|Chubb et al.|2006|Ref=APS2006}}.</ref> Most scientists have met these reports with ].<ref>{{harvnb|Feder|2005}},{{harvnb|Hutchinson|2006}},{{harvnb|Kruglinksi|2006}}</ref> In 2004 the US DOE organized another review panel ({{harvnb|US DOE|2004|Ref=DOE2004r}}) which&mdash;like the one in 1989&mdash;did not recommend a focused federally-funded program for low energy nuclear reactions. The 2004 panel identified basic research areas that could be helpful in resolving some of the controversies in the field. It stated that the field would benefit from the peer-review processes associated with proposal submission to agencies and paper submission to archival academic journals.


== History == == History ==
=== Early work === === Early work ===
The special ability of palladium to absorb hydrogen was recognized as early as the nineteenth century by ].<ref name="DOE_1989_7">{{harvnb|US DOE|1989|Ref=DOE1989|p=7}}.</ref> In the late nineteen-twenties, two ] scientists, ] and K. Peters, reported the transformation of hydrogen into helium by spontaneous nuclear catalysis when hydrogen was absorbed by finely divided palladium at room temperature.<ref name="DOE_1989_7">{{harvnb|US DOE|1989|Ref=DOE1989|p=7}}.</ref> These authors later acknowledged that the helium they measured was due to background from the air. The ability of palladium to absorb hydrogen was recognized as early as the nineteenth century by ].<ref name="DOE_1989_7">{{harvnb|US DOE|1989|Ref=DOE1989|p=7}}</ref> In the late nineteen-twenties, two ]n born scientists, ] and ], originally reported the transformation of hydrogen into helium by spontaneous nuclear catalysis when hydrogen was absorbed by finely divided palladium at room temperature. However, the authors later retracted that report, acknowledging that the helium they measured was due to background from the air.<ref name="DOE_1989_7" /><ref>{{harvnb|Paneth and Peters|1926|Ref=CITEREFPanethPeters1926}}</ref>


In 1927, ] scientist J. Tandberg stated that he had fused hydrogen into helium in an ] with palladium electrodes.<ref name="DOE_1989_7">{{harvnb|US DOE|1989|Ref=DOE1989|p=7}}.</ref> On the basis of his work, he applied for a Swedish patent for "a method to produce helium and useful reaction energy". After deuterium was discovered in 1932, Tandberg continued his experiments with ]. Due to Paneth and Peters' retraction, Tandberg's patent application was eventually denied.<ref name="DOE_1989_7">{{harvnb|US DOE|1989|Ref=DOE1989|p=7}}.</ref> In 1927, ] scientist J. Tandberg stated that he had fused hydrogen into helium in an ] with palladium electrodes.<ref name="DOE_1989_7"/> On the basis of his work, he applied for a Swedish patent for "a method to produce helium and useful reaction energy". After deuterium was discovered in 1932, Tandberg continued his experiments with ]. Due to Paneth and Peters' retraction, Tandberg's patent application was eventually denied.<ref name="DOE_1989_7"/>


The term "cold fusion" was coined by Dr. Paul Palmer of ] in 1986 in an investigation of "geo-fusion", or the possible existence of fusion in a ].<ref name="Kowalski_2004_IIA2">{{harvnb|Kowalski|2004|loc=II.A2}}.</ref> The term "cold fusion" was used as early as 1956 in a New York Times article about ]' work on ].<ref name="nytLaurence">
{{cite news
| work = ]
| title = Cold Fusion of Hydrogen Atoms; A Fourth Method Pulling Together
| author = William L. Laurence
| date = 1956-12-30
| pages = E7
| url = http://select.nytimes.com/gst/abstract.html?res=F10911F63B5B15738FDDA90B94DA415B8689F1D3&scp=11&sq=%22Cold%20Fusion&st=cse
}}</ref>

] of ] also used the term "cold fusion" in 1986 in an investigation of "geo-fusion", or the possible existence of fusion in a ].<ref name="Kowalski_2004_IIA2">{{harvnb|Kowalski|2004|loc=II.A2}}</ref>


=== Fleischmann-Pons announcement === === Fleischmann-Pons announcement ===
]] of the ] and ] of the ] hypothesized that the high compression ratio and mobility of deuterium that could be achieved within palladium metal using electrolysis might result in nuclear fusion.<ref name="FleischmannPons_1989_301">{{harvnb|Fleischmann|Pons|1989|p=301}}</ref> To investigate, they conducted electrolysis experiments using a palladium cathode and heavy water within a calorimeter, an insulated vessel designed to measure process heat. Current was applied continuously for many weeks, with the ] being renewed at intervals.<ref name="FleischmannPons_1989_301"/> Some deuterium was thought to be accumulating within the cathode, but most was allowed to bubble out of the cell, joining oxygen produced at the anode.<ref name="FleischmannPons_1990">{{harvnb|Fleischmann et al.|1990|Ref=Fleischmann1990}}</ref> For most of the time, the power input to the cell was equal to the calculated power leaving the cell within measurement accuracy, and the cell temperature was stable at around 30&nbsp;°C. But then, at some point (and in some of the experiments), the temperature rose suddenly to about 50&nbsp;°C without changes in the input power. These high temperature phases would last for two days or more and would repeat several times in any given experiment once they had occurred. The calculated power leaving the cell was significantly higher than the input power during these high temperature phases. Eventually the high temperature phases would no longer occur within a particular cell.<ref name="FleischmannPons_1990"/>
Fleischmann said that he began investigating the possibility that ] could influence nuclear processes in the 1960s.<ref name="Fleischmann_2003_1">{{harvnb|Fleischmann|2003|p=1}}.</ref> He said that he explored whether collective effects, that would require ] to calculate, might be more significant than the effects predicted by ] calculations.<ref name="Fleischmann_2003_3">{{harvnb|Fleischmann|2003|p=3}}.</ref><ref>{{harvnb|Leggett|1989}}.</ref> He said that, by 1983, he had experimental evidence leading him to believe that condensed phase systems developed ] structures up to 10<sup>-7</sup>m in size.<ref name="Fleischmann_2003_3">{{harvnb|Fleischmann|2003|p=3}}.</ref> In 1984, Fleischmann and Pons began cold fusion experiments.<ref>{{harvnb|Lewenstein|1994}} p. 21.</ref>
]

In their original set-up, Fleischmann and Pons used a ] (a double-walled vacuum flask) for the ], so that heat conduction would be minimal on the side and the bottom of the cell (only 5 % of the heat loss in this experiment). The cell flask was then submerged in a bath maintained at constant temperature to eliminate the effect of external heat sources. They used an open cell, thus allowing the ]eous deuterium and oxygen resulting from the electrolysis reaction to leave the cell, along with some heat. It was necessary to replenish the cell with ] at regular intervals. The authors said that, since the cell was tall and narrow, the bubbling action of the gas kept the electrolyte well mixed and of a uniform temperature. Special attention was paid to the purity of the palladium cathode and electrolyte to prevent the build-up of material on its surface, especially after long periods of operation.

The cell was also instrumented with a ] to measure the temperature of the ], and an electrical heater to generate pulses of heat and calibrate the heat loss due to the gas outlet. After ], it was possible to compute the heat generated by the reaction.<ref name="FleischmannPons_1989_301">{{harvnb|Fleischmann|Pons|1989|p=301}}.</ref>

A constant current was applied to the cell continuously for many weeks, and heavy water was added as necessary. For most of the time, the power input to the cell was equal to the power that went out of the cell within measuring accuracy, and the cell temperature was stable at around 30 °C. But then, at some point (and in some of the experiments), the temperature rose suddenly to about 50 °C without changes in the input power, for durations of 2&nbsp;days or more. The generated power was calculated to be about 20 times the input power during the power bursts. Eventually the power bursts in any one cell would no longer occur and the cell was turned off.


In 1988, Fleischmann and Pons applied to the ] for funding towards a larger series of experiments. Up to this point they had been funding their experiments using a small device built with $100,000 ].<ref name="LADN_092489">{{harvnb|Crease|Samios|1989|p=V1}}.</ref> The grant proposal was turned over for ], and one of the reviewers was ] of ].<ref name="LADN_092489">{{harvnb|Crease|Samios|1989|p=V1}}.</ref> Jones had worked on ] for some time, and had written an article on the topic entitled "Cold nuclear fusion" that had been published in '']'' in July 1987. Fleischmann and Pons and co-workers met with Jones and co-workers on occasion in ] to share research and techniques. During this time, Fleischmann and Pons described their experiments as generating considerable "excess energy", in the sense that it could not be explained by ]s alone.<ref name = "vxuvtq">{{harvnb|Fleischmann et al.|1990|Ref=Fleischmann1990|p=293}}</ref> They felt that such a discovery could bear significant commercial value and would be entitled to ]. Jones, however, was measuring neutron flux, which was not of commercial interest.<ref name="LADN_092489">{{harvnb|Crease|Samios|1989|p=V1}}.</ref> In order to avoid problems in the future, the teams appeared to agree to simultaneously publish their results, although their accounts of their ] meeting differ.<ref name="Lewenstein-1994_8">{{harvnb|Lewenstein|1994|p=8}}</ref> In 1988, Fleischmann and Pons applied to the ] for funding towards a larger series of experiments. Up to this point they had been funding their experiments using a small device built with $100,000 ].<ref name="LADN_092489">{{harvnb|Crease|Samios|1989|p=V1}}</ref> The grant proposal was turned over for ], and one of the reviewers was ] of ].<ref name="LADN_092489"/> Jones had worked for some time on ], a known method of inducing nuclear fusion without high temperatures, and had written an article on the topic entitled "Cold nuclear fusion" that had been published in '']'' in July 1987. Fleischmann and Pons and co-workers met with Jones and co-workers on occasion in ] to share research and techniques. During this time, Fleischmann and Pons described their experiments as generating considerable "excess energy", in the sense that it could not be explained by ]s alone.<ref name = "vxuvtq">{{harvnb|Fleischmann et al.|1990|Ref=Fleischmann1990|p=293}}</ref> They felt that such a discovery could bear significant commercial value and would be entitled to ]. Jones, however, was measuring neutron flux, which was not of commercial interest.<ref name="LADN_092489"/> In order to avoid problems in the future, the teams appeared to agree to simultaneously publish their results, although their accounts of their March 6 meeting differ.<ref name="Lewenstein-1994_8">{{harvnb|Lewenstein|1994|p=8}}</ref>


In mid-March, both research teams were ready to publish their findings, and Fleischmann and Jones had agreed to meet at an airport on ] to send their papers to '']'' via ].<ref name="Lewenstein-1994_8">{{harvnb|Lewenstein|1994|p=8}}</ref> Fleischmann and Pons, however, broke their apparent agreement, submitting their paper to the ''Journal of Electroanalytical Chemistry'' on ], and disclosing their work via a press conference on March 23.<ref name="LADN_092489">{{harvnb|Crease|Samios|1989|p=V1}}.</ref> Jones, upset, faxed in his paper to ''Nature'' after the press conference.<ref name="Lewenstein-1994_8">{{harvnb|Lewenstein|1994|p=8}}</ref> In mid-March 1989, both research teams were ready to publish their findings, and Fleischmann and Jones had agreed to meet at an airport on March 24 to send their papers to '']'' via ].<ref name="Lewenstein-1994_8"/> Fleischmann and Pons, however, broke their apparent agreement, submitting their paper to the ''Journal of Electroanalytical Chemistry'' on March 11, and disclosing their work via a press conference on March 23.<ref name="LADN_092489"/> Jones, upset, faxed in his paper to '']'' after the press conference.<ref name="Lewenstein-1994_8"/>


=== Reaction to the announcement === === Reaction to the announcement ===
Fleischmann and Pons' announcement drew wide media attention.<ref name=Brooks>For example, in 1989, the ''Economist'' editorialized that the cold fusion "affair" was "exactly what science should be about." Michael Brooks, "13 Things That Don't Make Sense" (ISBN 978-1-60751-666-8), p. 67 (New York:Doubleday, 2008), citing J. (Jerrold) K. Footlick, "Truth and Consequences: how colleges and universities meet public crises" (ISBN 9780897749701), p. 51 (Phoenix:Oryx Press, 1997).</ref>
The press initially reported on the experiments widely, and due to the surmised beneficial commercial applications of the Utah experiments, "scores of laboratories in the United States and abroad" attempted to repeat the experiments.<ref name="Browne_1989_para13">{{harvnb|Browne|1989|loc=para. 13}}.</ref> The announcement raised hopes of a cheap and abundant source of energy.<ref name="Browne_1989_para1">{{harvnb|Browne|1989|loc=para. 1}}.</ref>


Scores of laboratories in the United States and abroad attempted to repeat the experiments.<ref name="Browne_1989"/> A few reported success, many others failure.<ref name="Browne_1989"/> Even those reporting success had difficulty reproducing Fleischmann and Pons' results.<ref>{{harvnb|Schaffer|1999|Ref=Saeta1999|p=1}}</ref> One of the more prominent reports of success came from a group at the ], which observed neutron production.<ref name="Broad_1989">{{harvnb|Broad|1989}}</ref> The Georgia Tech group later retracted their announcement.<ref name="Wilford_1989">{{harvnb|Wilford|1989}}</ref> Another team, headed by ] at ] also reported early success,<ref>Broad, William J. 19 April 1989. , '']''.</ref> but this too was refuted.<ref name="nytdebunk"/> For weeks, competing claims, counterclaims and suggested explanations kept what was referred to as "cold fusion" or "fusion confusion" in the news.<ref>{{harvnb|Bowen|1989}}</ref>
On ], ], Fleischmann and Pons, who later suggested pressure from patent attorneys, published a rushed "preliminary note" in the ''Journal of Electroanalytical Chemistry''.<ref name="FleischmannPons_1989_301">{{harvnb|Fleischmann|Pons|1989|p=301}}.</ref> This paper notably contained a gamma peak without its corresponding ], a discrepancy that triggered accusations of fraud.<ref>{{harvnb|Tate|1989|p=1}}.</ref><ref>{{harvnb|Platt|1989}}.</ref> Their "preliminary note" was followed up a year later in July 1990, when a much longer paper, going into details of calorimetry but without any nuclear measurements, was published in the same journal.<ref name = "vxuvtq"/>


In May 1989, the ] held a session on cold fusion, at which were heard many reports of experiments that failed to produce evidence of cold fusion. At the end of the session, eight of the nine leading speakers stated they considered the initial Fleischmann and Pons claim dead.<ref name="Browne_1989">{{harvnb|Browne|1989}}</ref>
Also occurring on April 10, a team at ] published their results of excess heat, followed up by a team at the ] who observed production of neutrons.<ref name="Broad_1989">{{harvnb|Broad|1989}}.</ref> Both results were widely reported on in the press, although both Texas A&M and the Georgia Institute of Technology withdrew their results for lack of evidence.<ref name="Broad_1989">{{harvnb|Broad|1989}}.</ref> For the next six weeks, additional competing claims, counterclaims and suggested explanations kept what was referred to as "cold fusion" or "fusion confusion" in the news.<ref>{{harvnb|Bowen|1989}}.</ref>


In April 1989, Fleischmann and Pons published a "preliminary note" in the '']''.<ref name="FleischmannPons_1989_301"/> This paper notably showed a gamma peak without its corresponding ], which indicated they had made a mistake in claiming evidence of fusion byproducts.<ref>{{harvnb|Tate|1989|p=1}}</ref><ref>{{harvnb|Platt|1998}}</ref> The preliminary note was followed up a year later with a much longer paper that went into details of calorimetry but did not include any nuclear measurements.<ref name = "vxuvtq"/>
On ], Pons received a standing ovation from about 7,000 chemists at the semi-annual meeting of the ]. The University of Utah asked Congress to provide $25&nbsp;million to pursue the research,<ref name="Browne_1989_para8">{{harvnb|Browne|1989|loc=para. 8}}.</ref> and Pons was scheduled to meet with representatives of ] in early May.


In July and November 1989, ''Nature'' published papers critical of cold fusion claims.<ref>{{harvnb|Gai et al.|Ref=Gai1989|1989|pp=29-34}}</ref><ref>{{harvnb|Williams et al.|1989|Ref=Williams1989|pp=375-384}}</ref>
Then on ], the ] held a session on cold fusion, which included several reports of experiments that failed to produce evidence of cold fusion. A second session began the next day with other negative reports, and eight of the nine leading speakers stated that they considered the initial Utah claim dead.<ref name="Browne_1989">{{harvnb|Browne|1989}}</ref> Dr. Steven E. Koonin of ] described the Utah report as a result of "the incompetence and delusion of Pons and Fleischmann."<ref name="Browne_1989">{{harvnb|Browne|1989}}</ref> Dr. Douglas R. O. Morrison, a physicist representing ], called the entire episode an example of ].<ref name="Browne_1989_para29">{{harvnb|Browne|1989|loc=para. 29}}.</ref><!-- The following citation does not support that statement: {{citation|editor-last=Krumhansi|editor-first=J. A.|title=APS Special Session on Cold Fusion, May 1-2, 1989|year=1989|url=http://www.ibiblio.org/pub/academic/physics/Cold-fusion/vince-cate/aps.ascii}} -->''Nature'' published papers critical of cold fusion in July and November.<ref>{{harvnb|Gai et al.|Ref=Gai1989|1989|pp=29-34}}.</ref><ref>{{harvnb|Williams et al.|1989|Ref=Williams1989|pp=375-384}}.</ref> Science writers ] and ] have published books criticizing cold fusion experiments and researchers.<ref name="Taubes_1993">{{harvnb|Taubes|1993}}</ref><ref name="Park_2000">{{harvnb|Park|2000}}</ref>


Nevertheless, Fleischmann and Pons and a number of other researchers who found positive results remained convinced of their findings.<ref name="Browne_1989"/> In August 1989, the ] invested $4.5 million to create the National Cold Fusion Institute.<ref>{{harvnb|Joyce|1990}}</ref>
=== 1989 DOE panel ===
In November, a special panel formed by the Energy Research Advisory Board, under a charge of the ], said that it was not possible to state categorically that cold fusion has been convincingly either proved or disproved.<ref name="DOE_1989_36">{{harvnb|US DOE|1989|Ref=DOE1989|p=36}}</ref> The experimental results of excess heat from calorimetric cells reported to them did not present convincing evidence that useful sources of energy will result from the phenomena attributed to cold fusion. These experiments did not present convincing evidence to associate the reported anomalous heat with a nuclear process. Current understanding of hydrogen in solids gives no support for the occurrence of cold fusion in solids. Nuclear fusion at room temperature, of the type discussed in this report, would be contrary to all understanding gained of nuclear reactions in the last half century; it would require the invention of an entirely new nuclear process.


The ] organized a special panel to review cold fusion theory and research.<ref name="DOE_1989_39">{{harvnb|US DOE|1989|Ref=DOE1989|p=39}}</ref> The panel issued its report in November 1989, concluding that results as of that date did not present convincing evidence that useful sources of energy would result from phenomena attributed to cold fusion.<ref name="DOE_1989_36">{{harvnb|US DOE|1989|Ref=DOE1989|p=36}}</ref> The panel noted the inconsistency of reports of excess heat and the greater inconsistency of reports of nuclear reaction byproducts. Nuclear fusion of the type postulated would be inconsistent with current understanding and would require the invention of an entirely new nuclear process. The panel was against special funding for cold fusion research, but supported modest funding of "focused experiments within the general funding system."<ref name="DOE_1989_37">{{harvnb|US DOE|1989|Ref=DOE1989|p=37}}</ref>
The panel "recommended against the establishment of special programs or research centers to develop cold fusion", but was "sympathetic toward modest support for carefully focused and cooperative experiments within the present funding system." The Panel recommended that "the cold fusion research efforts in the area of heat production focus primarily on confirming or disproving reports of excess heat" and stated that "investigations designed to check the reported observations of excess tritium in electrolytic cells are desirable.". <ref name="DOE_1989_37">{{harvnb|US DOE|1989|Ref=DOE1989|p=37}}.</ref>


In the ensuing years, several books came out critical of cold fusion research methods and the conduct of cold fusion researchers.<ref>{{harvnb|Taubes|1993}}, {{harvnb|Close|1992}}, {{harvnb|Huizenga|1993}}, {{harvnb|Park|2000}}</ref>
=== Further developments (1989-2004) ===
The first published replication of excess heat was reported by Richard Oriani while he was professor of physical chemistry at the ], in December 1990. The results were published in his paper, "Calorimetric Measurements of Excess Power Output During the Cathodic Charging of Deuterium Into Palladium", in ''Fusion Technology''.<ref>{{harvnb|Oriani|Nelson|Lee|Broadhurst|1990|pp=652-662}}, cited by {{harvnb|Krivit|2005}}..</ref>


===Further developments===
In 1991, Dr. ] stated that the negative report issued by the ] in 1989, which was highly influential in the controversy, was fraudulent because data was shifted without explanation, obscuring a possible positive excess heat result at MIT.<!-- the following citation is not valid (or is OR) for the previous statement. {{cite web|last=Krivit|first=Steven|title=Controversial MIT. Cold Fusion Graphs|url=http://newenergytimes.com/Reports/HistoricalAnalysisSummaryCharts.htm#mit}}</ref> --> In protest of ]'s failure to discuss and acknowledge the significance of this data shift, Mallove resigned from his post as chief science author at the MIT news office on ], ]. He maintained that the data shift was biased to support the conventional belief in the non-existence of the cold fusion effect as well as to protect the financial interests of the plasma fusion center's research in hot fusion.<ref>{{harvnb|Mallove|1999}}.</ref>
Cold fusion claims were, and still are, considered extraordinary.<ref>{{harvnb|Schaffer|1999|Ref=Saeta1999|p=3}}</ref> In view of the ] alone, most scientists would require extraordinarily conclusive data to be convinced that cold fusion has been discovered.<ref>{{harvnb|Schaffer|1999|Ref=Saeta1999|p=3}}, {{harvnb|Adam|2005}} - ("Extraordinary claims . . . demand extraordinary proof")</ref> After the fiasco following the Pons and Fleischmann announcement, most scientists became dismissive of new experimental claims.<ref>{{harvnb|Schaffer and Morrison|1999|Ref=Saeta1999|p=3}} ("You mean it's not dead?" – recounting a typical reaction to hearing a cold fusion conference was held recently) </ref> The ] rejects any patent claiming cold fusion, using the same argument as with ]s: that it doesn't work.<ref>{{cite journal | work = ] | title = Warming Up to Cold Fusion | first = Sharon | last = Weinberger | date = 2004-11-21 | page = W22 | url = http://www.washingtonpost.com/wp-dyn/articles/A54964-2004Nov16.html }} (page 2 in online version)</ref>


Nevertheless, there were positive results that kept some researchers interested and got new researchers involved.<ref>{{harvnb|Adam|2005}} - ("Advocates insist that there is just too much evidence of unusual effects in the thousands of experiments since Pons and Fleischmann to be ignored")</ref> In September 1990, Fritz Will, Director of the National Cold Fusion Institute, compiled a list of 92 groups of researchers from 10 different countries that had reported excess heat, <sup>3</sup>H, <sup>4</sup>He, neutrons or other nuclear effects.<ref>{{harvnb|Mallove|1991|p=246-248}}</ref>
The late Nobel Laureate ] (1918 - 1994) also stated in 1991 that he had experienced "the pressure for conformity in editor's rejection of submitted papers, based on venomous criticism of anonymous reviewers," and that "the replacement of impartial reviewing by censorship will be the death of science."<ref>{{harvnb|Schwinger|1991}}.</ref> He resigned as Member and Fellow of the ] in protest of its peer review practice on cold fusion.


Fleischmann and Pons relocated their laboratory to France under a grant from the ]. The laboratory, IMRA, was closed in 1998 after spending £12 million on cold fusion work.<ref>{{harvnb|Voss|1999|Ref=Voss1999}}</ref>
In 1991, researcher Andrew Riley was killed when a cold fusion cell exploded, possibly due to accumulation of deuterium gas.<ref name="Charles_1992">{{harvnb|Charles|1992}}.</ref>


Between 1992 and 1997, Japan's ] sponsored a "New Hydrogen Energy Program" of US$20&nbsp;million to research cold fusion. Announcing the end of the program in 1997, Hideo Ikegami stated "We couldn't achieve what was first claimed in terms of cold fusion." He added, "We can't find any reason to propose more money for the coming year or for the future."<ref>{{harvnb|Pollack|1997|p=C4}}</ref>
In 1992, workers at General Electric challenged the Fleischmann-Pons 1990 report in the ''Journal of Electroanalytical Chemistry'', stating that the claims of excess heat had been overstated.<ref>{{harvnb|Wilson|1992|p=1}}, cited by {{harvnb|Krivit|2005}}.</ref> The challenge concluded that the Fleischmann and Pons cell generated 40% excess heat, more than ten times larger than the initial error estimate. Despite the apparent confirmation, Fleischmann and Pons replied to General Electric and published a rebuttal in the same journal.<ref>{{harvnb|Beaudette|2002|pp=188, 357-360}}.</ref><!-- commented out extraordinary statement lacking extraordinary sources: "...which has never been refuted in scientific literature."<ref>{{cite web|last=Krivit|first=Steven|title=The Seminal Papers of Cold Fusion|publisher=New Energy Times|url=http://newenergytimes.com/PR/TheSeminalPapers.htm}}</ref> -->
]


In 1994, ] described cold fusion as "a pariah field, cast out by the scientific establishment. Between cold fusion and respectable science there is virtually no communication at all. Cold fusion papers are almost never published in refereed scientific journals, with the result that those works don't receive the normal critical scrutiny that science requires. On the other hand, because the Cold-Fusioners see themselves as a community under siege, there is little internal criticism. Experiments and theories tend to be accepted at face value, for fear of providing even more fuel for external critics, if anyone outside the group was bothering to listen. In these circumstances, crackpots flourish, making matters worse for those who believe that there is serious science going on here."<ref name="Goodstein_1994">{{harvnb|Goodstein|1994}}</ref>
Fleischmann and Pons relocated their laboratory to France under a grant from the ]. The laboratory, IMRA, was closed in 1998 after spending £12 million on cold fusion work.<ref>{{harvnb|Voss|1999}}.</ref>


In some cases, cold fusion researchers contend that cold fusion research is being suppressed.{{Fact|date=May 2009}} They complained there was virtually no possibility of obtaining funding for cold fusion research in the United States, and no possibility of getting published.<ref name="Feder_2004_27">{{harvnb|Feder|2004|p=27}}</ref> University researchers were unwilling to investigate cold fusion because they would be ridiculed by their colleagues.<ref>{{harvnb|Adam|2005}} (comment attributed to George Miley of the University of Illinois) </ref> In a biography by Jagdish Mehra et al. it is mentioned that to the shock of most physicists, the ] ] declared himself a supporter of cold fusion and tried to publish a paper on it in ]; when it was roundly rejected, in a manner that he considered deeply insulting, he resigned from that body in protest.<ref>{{cite book | title = Climbing the Mountain: The Scientific Biography of Julian Schwinger | author = Jagdish Mehra, K. A. Milton, Julian Seymour Schwinger | edition = illustrated | editor = ] | year = 2000 | isbn = 0198506589 | page = 550 | url = http://books.google.com/books?id=9SmZSN8F164C&pg=PA550&vq=resigned+american+physical+society+cold+fusion&dq=Julian+Schwinger+cold+fusion&hl=es&source=gbs_search_s&cad=0 }}</ref>
], a cold fusion proponent, contends that by 1991, 92 groups of researchers from 10 different countries had reported excess heat, tritium, helium4, neutrons or other nuclear effects.<ref>{{harvnb|Mallove|1991|p=246-248}}.</ref> Proponents estimate that 3,000 cold fusion papers have been published, <ref>{{harvnb|Anderson|2007}}</ref> including over 1,000 journal papers and books, where the latter number includes both pro and con articles.{{Ref_label|heat_tritium_reports|α|none}}


Researchers share their results at the International Conference on Cold Fusion, recently renamed the International Conference on Condensed Matter Nuclear Science. The conference is held every 12 to 18&nbsp;months in various countries around the world, and is hosted by , a scientific organization that was founded as a professional society to support research efforts and to communicate experimental results. A few periodicals emerged in the 1990s that covered developments in cold fusion and related new energy sciences (''Fusion Facts, Cold Fusion Magazine, Infinite Energy Magazine'', and ''New Energy Times''). To provide a forum for researchers to share their results, the first International Conference on Cold Fusion was held in 1990. The conference, recently renamed the International Conference on Condensed Matter Nuclear Science, is held every 12 to 18&nbsp;months in various countries around the world. The periodicals ''Fusion Facts'', ''Cold Fusion Magazine'', ''Infinite Energy Magazine'', and ''New Energy Times'' were established in the 1990s to cover developments in cold fusion and related new energy sciences. In 2004 The ] (ISCMNS) was formed "To promote the understanding, development and application of Condensed Matter Nuclear Science for the benefit of the public."
] of the open type, used at the New Hydrogen Energy Institute in Japan. ''Source: SPAWAR/US Navy TR1862'']]


In the 1990s, India stopped its research in cold fusion due to the lack of consensus among mainstream scientists and the US denunciation of it.<ref name="jayaraman">{{harvnb|Jayaraman|2008}}</ref> It was later resumed in 2008 (see below).
Between 1992 and 1997, Japan's ] sponsored a "New Hydrogen Energy Program" of US$20&nbsp;million to research cold fusion. Announcing the end of the program, Dr. Hideo Ikegami stated in 1997 "We couldn't achieve what was first claimed in terms of cold fusion." He added, "We can't find any reason to propose more money for the coming year or for the future."<ref>{{harvnb|Pollack|1997|p=C4}}.</ref>


In February 2002, the U.S. Navy revealed that its researchers had been quietly studying cold fusion continually since 1989. Researchers at their ] in ] released a two-volume report, entitled "Thermal and nuclear aspects of the Pd/D<sub>2</sub>O system," with a plea for proper funding.<ref>{{harvnb|Mullins|2004}}</ref>
In 1994, Dr. ] described cold fusion as "a pariah field, cast out by the scientific establishment. Between and respectable science there is virtually no communication at all. Cold fusion papers are almost never published in refereed scientific journals, with the result that those works don't receive the normal critical scrutiny that science requires. On the other hand, because the Cold-Fusioners see themselves as a community under siege, there is little internal criticism. Experiments and theories tend to be accepted at face value, for fear of providing even more fuel for external critics, if anyone outside the group was bothering to listen. In these circumstances, crackpots flourish, making matters worse for those who believe that there is serious science going on here."<ref name="Goodstein_1994">{{harvnb|Goodstein|1994}}.</ref>


In 2004, at the request of cold fusion advocates, the DOE organized a second review of the field. Cold fusion researchers presented a review document stating that the observation of excess heat has been reproduced, that it can be reproduced at will under the proper conditions, and that many of the reasons for failure to reproduce it have been discovered.<ref>{{harvnb|Hagelstein et al.|2004|Ref=DOE2004|p=3, 14}}</ref>
Cold fusion researchers said that cold fusion was being suppressed, and that skeptics suffered from "]".<ref>{{harvnb|Josephson|2004}}.</ref> They said that there was virtually no possibility for funding in cold fusion in the United States, and no possibility of getting published.<ref name="Feder_2004_27">{{harvnb|Feder|2004|p=27}}.</ref> They said that people in universities refused to work on it because they would be ridiculed by their colleagues.<ref>{{harvnb|Rusbringer|2005}}</ref>
18 reviewers in total examined the written and oral testimony given by cold fusion researchers. On the question of excess heat, the reviewers' opinions ranged from "evidence of excess heat is compelling" to "there is no convincing evidence that excess power is produced when integrated over the life of an experiment". The report states the reviewers were split approximately evenly on this topic. On the question of evidence for nuclear fusion, the report states: {{cquote|Two-thirds of the reviewers...did not feel the evidence was conclusive for low energy nuclear reactions, one found the evidence convincing, and the remainder indicated they were somewhat convinced. Many reviewers noted that poor experiment design, documentation, background control and other similar issues hampered the understanding and interpretation of the results presented.}} On the question of further research, the report reads:<ref>{{harvnb|US DOE|2004|Ref=DOE2004r}}</ref>{{cquote|The nearly unanimous opinion of the reviewers was that funding agencies should entertain individual, well-designed proposals for experiments that address specific scientific issues relevant to the question of whether or not there is anomalous energy production in Pd/D systems, or whether or not D-D fusion reactions occur at energies on the order of a few eV. These proposals should meet accepted scientific standards, and undergo the rigors of peer review. No reviewer recommended a focused federally funded program for low energy nuclear reactions.}}


Thirteen papers were presented at the "Cold Fusion" session of the March 2006 American Physical Society (APS) meeting in Baltimore.<ref>{{harvnb|Chubb et al.|2006|Ref=APS2006}}, {{harvnb|Adam|2005}} ("Anyone can deliver a paper. We defend the openness of science" - Bob Parks of APS, explaining that hosting the meeting does not show a softening of scepticism)</ref> In 2007, the American Chemical Society's (ACS) held an "invited symposium" on cold fusion and low-energy nuclear reactions.<ref>{{harvnb|Van Noorden|2007|loc=para. 2}}</ref> Cold fusion reports have been published in ''], ], ], ], ], ], ]'', and '']''.<ref>{{harvnb|Di Giulio|2002}}</ref>
In February 2002, a laboratory within the United States Navy released a report<ref>{{harvnb|Szpak|Mosier-Boss|2002a}}</ref><ref>{{harvnb|Szpak|Mosier-Boss|2002b}}</ref> that came to the conclusion that the cold fusion phenomenon was in fact real and deserved an official funding source for research.<ref>{{harvnb|Szpak|Mosier-Boss|2002a|p=iv-v}}</ref> Navy researchers say that, since 1990, they have published roughly 10 papers on cold fusion in ].<ref>{{harvnb|Szpak|Mosier-Boss|2002a|p=113}}</ref>


Cold fusion researchers have described possible cold fusion mechanisms, but they have not received mainstream acceptance.<ref name="Biberian_2007">{{harvnb|Biberian|2007}}</ref> ''Physics Today'' said, in 2005, that new reports of excess heat and other cold fusion effects were still no more convincing than 15 years ago.<ref>{{harvnb|Feder|2005}}</ref> 20 years later, in 2009, cold fusion researchers complain that the flaws in the original announcement still cause the field to be marginalized and to suffer a chronic lack of funding.<ref name="bbc march 2009">{{cite news | title=Cold fusion debate heats up again | work=] | date=2009-03-23 | url=http://news.bbc.co.uk/2/hi/science/nature/7959183.stm}}</ref> Frank Close claims that a problem plaguing the original announcement is still happening: results from studies are still not being independently verified, and that inexplicable phenomena encountered in the last twenty years are being labeled as "cold fusion" even if they aren't, in order to attract attention from journalists.<ref name="bbc march 2009"/> A number of researchers keep researching and publishing in the field, working under the name of low-energy nuclear reactions, or LENR, in order to avoid the negative connotations of the "cold fusion" label.<ref name="bbc march 2009"/><ref name="wired march 2009">{{cite news | title=March 23, 1989: Cold Fusion Gets Cold Shoulder | work=] | date=2009-03-23 | url=http://www.wired.com/science/discoveries/news/2009/03/dayintech_0323 }}</ref><ref>{{harvnb|Shamoo|2003|Ref=Shamoo_2005|p=132-133}}</ref>
=== 2004 DOE panel ===
In 2004, the DOE organized another panel to take a look at cold fusion developments since 1989 to determine if their policies towards cold fusion should be altered.<ref name="DOEr_2004_3">{{harvnb|US DOE|2004|Ref=DOE2004r|p=3}}.</ref>


Research in India started again in 2008 in several centers like the ] thanks to the pressure of influential Indian scientists; the ] has also recommended the Indian government to revive this research.<ref name="jayaraman"/>
It concluded: "While significant progress has been made in the sophistication of calorimeters since the review of this subject in 1989, the conclusions reached by the reviewers today are similar to those found in the 1989 review." "The nearly unanimous opinion of the reviewers in the 2004 review was that funding agencies should entertain individual, well-designed proposals for experiments that address specific scientific issues relevant to the question of whether or not there is anomalous energy production in Pd/D systems, or whether or not D-D fusion reactions occur at energies on the order of a few ]s (eV). These proposals should meet accepted scientific standards and undergo the rigors of peer review. No reviewer recommended a focused federally funded program for low energy nuclear reactions." "The reviewers believed that this field would benefit from the peer-review processes associated with proposal submission to agencies and paper submission to archival journals."<ref name="DOEr_2004_5">{{harvnb|US DOE|2004|Ref=DOE2004r|p=5}}.</ref>


] plastic radiation detector claimed as evidence for neutron emission from palladium deuteride, suggestive of a deuterium-tritium reaction]]
=== Recent developments ===
On 22–25 March 2009, the ] held a four-day symposium on "New Energy Technology", in conjunction with the 20th anniversary of the announcement of cold fusion. At the conference, researchers with the U.S. Navy's ] (SPAWAR) reported detection of energetic ] in a ] cell using ],<ref> 'Cold fusion' rebirth? New evidence for existence of controversial energy source</ref> a result previously published in '']''.<ref name="ns march 2009">{{cite web |url=
The reports of excess heat and anomalous tritium production{{Ref_label|heat_tritium_reports|α|none}} have been met by most scientists with ],<ref>{{harvnb|Feder|2005}}</ref> although discussion in professional settings still continues. The American Chemical Society's (ACS) 2007 conference in Chicago held an "invited symposium" on cold fusion and low-energy nuclear reactions, and thirteen papers were presented at the "Cold Fusion" session of the 2006 American Physical Society (APS) March Meeting in Baltimore.<ref>{{harvnb|Van Noorden|2007|loc=para. 2}}.</ref><ref>{{harvnb|Chubb et al.|2006|Ref=APS2006}}.</ref> Articles supporting cold fusion have been published in ]ed journals such as ''Naturwissenschaften, European Physical Journal A, European Physical Journal C, Journal of Solid State Phenomena, Journal of Electroanalytical Chemistry, ]'', and ''Journal of Fusion Energy''. <ref> cited by Krivit, Steven, "Selected Papers - Low Energy Nuclear Reactions," </ref>
http://www.newscientist.com/article/dn16820-neutron-tracks-revive-hopes-for-cold-fusion.html |title=Neutron tracks revive hopes for cold fusion |accessdate=2009-03-24 |work= |publisher=New Scientist |date= }}</ref> Neutrons are indicative of nuclear reactions.<ref name="afp march 2009">{{cite web |url=
http://www.google.com/hostednews/afp/article/ALeqM5j2QobOQnlULUZ7oalSRUVjnlHjng |title=Scientists in possible cold fusion breakthrough |accessdate=2009-03-24 |work= |publisher=] |date= }}</ref>


==Experimental details==
In 2007, a ] researcher with no previous experience with cold fusion wrote a review of experiments with solid ] cathodes and electrolytes with ], or with D<sub>2</sub> gas loaded in palladium powders. The author said that more than 10 groups worldwide have reported the measurement of excess heat in 1/3 of their experiments and that most of the research groups have reported occasionally seeing 50-200% excess heat for hours to days. The difficulty of reproducing the research results were explained by the author as due to different research teams being able to achieve very different deuterium loading ratios within palladium.<ref name="Hubler_2007"/>
A cold fusion experiment usually includes:


* a metal, such as ] or ], in bulk, thin films or powder;
In 2008, the government of India reviewed the field.<ref>{{harvnb|Jayaraman|2008}}</ref> Dr. M. R. Srinivasan, former chairman of the ] said: "There is some science here that needs to be understood. We should set some people to investigate these experiments. There is much to be commended for the progress in the work. The neglect should come to an end".<ref>{{harvnb|Srinivasan|2008}}</ref> On May 22, 2008, Arata and Zhang publicly demonstrated what they say is a cold fusion reactor at ].<ref>{{harvnb|Cartwright|2008}}</ref><ref>{{harvnb|Cartwright|2008b}}</ref>
* ] and/or ], in the form of water, gas or plasma; and
* an excitation in the form of ], ], ], ], ] beam(s), or of ].<ref>{{harvnb|Storms|2007|p=144-150}}</ref>
Electrolysis cells can be either open cell or closed cell. In open cell systems, the electrolyis products, which are gaseous, are allowed to leave the cell. In closed cell experiments, the products are captured, for example by catalytically recombining the products in a separate part of the experimental system. These experiments generally strive for a steady state condition, with the electrolyte being replaced periodically. There are also "heat after death" experiments, where the evolution of heat is monitored after the electric current is turned off.


=== Excess heat observations===
== Summary of evidence for cold fusion ==
An excess heat observation is based on an energy balance. Various sources of energy input and output are continuously measured. Under normal condition, the energy input can be matched to the energy output to within experimental error. In experiments such as those run by Fleischmann and Pons, a cell operating steadily at one temperature transitions to operating at a higher temperature with no increase in applied current.<ref>{{harvnb|Fleischmann|1990}}</ref> In other experiments, however, no excess heat was discovered, and, in fact, even the heat from successful experiments was unreliable and could not be replicated independently.<ref name="saeta1999 p 2"/> If higher temperatures were real, and not experimental artifact, the energy balance would show an unaccounted term. In the Fleischmann and Pons experiments, the rate of inferred excess heat generation was in the range of 10-20% of total input. The high temperature condition would last for an extended period, making the total excess heat appear to be disproportionate to what might be obtained by ordinary chemical reaction of the material contained within the cell at any one time, though this could not be reliably replicated. <ref name="DOEr_2004_3">{{harvnb|US DOE|2004|Ref=DOE2004r|p=3}}</ref><ref name="Hubler_2007">{{harvnb|Hubler|2007}}</ref> Many others have reported similar results.<ref>{{harvnb|Oriani|Nelson|Lee|Broadhurst|1990|pp=652-662}}, cited by {{harvnb|Storms|2007|p=61}}</ref><ref>{{harvnb|Bush|Lagowski|Miles|Ostrom|1991}}, cited by {{harvnb|Biberian|2007}}</ref><ref>e.g. {{harvnb|Storms|1993}}, {{harvnb|Hagelstein et al.|2004|Ref=DOE2004}}</ref><ref>{{harvnb|Miles et al.|1993|Ref=MilesE}}</ref><ref>e.g. {{harvnb|Arata|Zhang|1998}}, {{harvnb|Hagelstein et al.|2004|Ref=DOE2004}}</ref><ref>{{harvnb|Gozzi|1998|Ref=GozziEtAl1998}}, cited by {{harvnb|Biberian|2007}}</ref>
Cold fusion experiments have been conducted with many types of apparatus. The main constituents are:
* a metal, such as Palladium or Nickel, in bulk, thin films or powder;
* an excitation in the form of electricity or magnetism, of temperature or pressure cycle, of laser beam, or of acoustic waves;
* heavy or light water, hydrogen or deuterium gas or plasma.<ref>{{harvnb|Storms|2007|p=144-150}}</ref>


A 2007 review determined that more than 10 groups world wide reported measurements of excess heat in 1/3 of their experiments using electrolysis of heavy water in open and/or closed electrochemical cells, or deuterium gas loading onto Pd powders under pressure. Most of the research groups reported occasionally seeing 50-200% excess heat for periods lasting hours or days.<ref name="Hubler_2007"/>
Cold fusion has remained controversial, but several experimenters have reported excess heat, ]s, ]s, ]s, ]s, helium-4, helium-3 , and/or anomalous isotopic distributions.<ref>{{harvnb|Biberian|2007}}</ref> A book and two peer-reviewed articles presented the state of the research in 2007.<ref>{{harvnb|Storms|2007}}</ref><ref>{{harvnb|Biberian|2007}}</ref><ref name="Hubler_2007"/>


In 1993, Fleischmann reported "heat-after-death" experiments: he observed the continuing generation of excess heat after the electric current supplied to the electrolytic cell was turned off.<ref>{{harvnb|Fleischmann|1993}}</ref> Similar observations have been reported by others as well.<ref>{{harvnb|Mengoli|1998}}</ref><ref name=Szpak2004>{{harvnb|Szpak|2004|Ref=Szpak2004}}</ref>
=== Excess heat ===
The excess power observed in some experiments is reported to be beyond that attributable to ordinary chemical or solid state sources; proponents attribute this excess power to nuclear fusion reactions.<ref name="DOEr_2004_3">{{harvnb|US DOE|2004|Ref=DOE2004r|p=3}}.</ref><ref name="Hubler_2007">{{harvnb|Hubler|2007}}.</ref>


===Reports of nuclear products in association with excess heat===
In addition to Fleischmann and Pons, the generation of excess heat has been reported by others, including:
{{POV-section|date=April 2009}}
* Richard A. Oriani, while he was professor at ], in 1990,<ref>{{harvnb|Oriani|Nelson|Lee|Broadhurst|1990|pp=652-662}}, cited by {{harvnb|Krivit|2005}}.</ref>
* Edmund Storms, while he was at ], in 1993,<ref>e.g. {{harvnb|Storms|1993}}, {{harvnb|Hagelstein et al.|2004|Ref=DOE2004}}.</ref>
* Bush, of ], in 1991,<ref>{{harvnb|Bush|Lagowski|Miles|Ostrom|1991}}, cited by {{harvnb|Biberian|2007}}.</ref>
* Miles, at the Naval Air Warfare Center Weapons Division, China Lake, in 1993,<ref>{{harvnb|Miles et al.|1993|Ref=MilesEtAl1993}}, cited by {{harvnb|Biberian|2007}}.</ref>
* Michael McKubre, of ], in 1994,<ref>e.g. {{harvnb|McKubre|1994}}, {{harvnb|Hagelstein et al.|2004|Ref=DOE2004}}.</ref>
* ], while he was professor at ], in 1998,<ref>e.g. {{harvnb|Arata|Zhang|1998}}, {{harvnb|Hagelstein et al.|2004|Ref=DOE2004}}.</ref>
* Gozzi, of ], in 1998.<ref>{{harvnb|Gozzi|1998|Ref=GozziEtAl1998}}, cited by {{harvnb|Biberian|2007}}.</ref>


Considerable attention has been given to measuring <sup>4</sup>He production.<ref>{{harvnb|Hagelstein et al.|2004|Ref=DOE2004}}</ref> In 1999 Schaffer says that the levels detected were very near to background levels, that there is the possibility of contamination by trace amounts of helium which are normally present in the air, and that the lack of detection of Gamma radiation led most of the scientific community to regard the presence of <sup>4</sup>He as the result of experimental error.<ref name="saeta1999 p 2"/> In the report presented to the DOE in 2004, <sup>4</sup>He was detected in five out of sixteen cases where electrolytic cells were producing excess heat.<ref name="DOE2004 helium">{{harvnb|US DOE|2004|Ref=DOE2004r|p=3,4}}</ref> The reviewers' opinion was divided on the evidence for <sup>4</sup>He; some points cited were that the amounts detected were above background levels but very close to them, that it could be caused by contamination from air, and there were serious concerns about the assumptions made in the theorical framework that tried to account for the lack of gamma rays.<ref name="DOE2004 helium"/>
The cold fusion researchers who presented their review document to the 2004 DOE panel said that "the hypothesis that the excess heat effect arises only as a consequence of errors in calorimetry was considered, studied, tested, and ultimately rejected".<ref name="DOE_2004_1">{{harvnb|Hagelstein et al.|2004|Ref=DOE2004|p=1}}.</ref> They said that numerous experiments conducted by ] showed excess power well above the accuracy of measurement.<ref>{{harvnb|Hagelstein et al.|2004|Ref=DOE2004|p=22}}.</ref> The researchers also said that the amount of energy reported in some of the experiments appeared to be too great compared to the small mass of the material in the cell for it to be stored by any chemical process. They said that their control experiments using light water did not show excess heat.


In 1999 several heavy elements had been detected by other researchers, specially ] in Japan, although the presence of these elements was so unexpected from the current understanding of these reactions that Schaffer said that it would require extraordinary evidence before the scientific community accepted it.<ref name="saeta1999 p 2">{{harvnb|Schaffer|1999|Ref=Saeta1999|p=2}}</ref> The report presented to the DOE in 2004 indicated that deuterium loaded foils could be used to detect fusion reaction products and, although the reviewers found the evidence presented to them as unconclusive, they indicated that those experiments didn't use ] techniques and it was a line of work that could give conclusive results on the matter.<ref>{{harvnb|US DOE|2004|Ref=DOE2004r|p=3,4,5}}</ref>.
=== Nuclear products ===
].<ref>{{harvnb|Mosier-Boss|Szpak|Gordon|2007|loc=slide 7}}<br />reported in {{harvnb|Krivit|2007|p=2}}.</ref>]] The cold fusion researchers who presented their review document to the 2004 DOE panel on cold fusion said that there are insufficient chemical reaction products to account for the excess heat by several orders of magnitude.<ref name="DOE_2004_7">{{harvnb|Hagelstein et al.|2004|Ref=DOE2004|p=7}}.</ref> They said that several independent studies have shown that the rate of helium production measured in the gas stream varies linearly with excess power. Bursts of excess energy were time-correlated with bursts of <sup>4</sup>He in the gas stream. Extensive precautions were taken to ensure that the samples were not contaminated by helium from the ] (5.2 ]). They say that "numerous investigators" <!--direct quote from source--> have reported that <sup>4</sup>He was produced at levels above that of the concentration in air.<ref>{{harvnb|Hagelstein et al.|2004|Ref=DOE2004|p=10}}.</ref> However, the amount of helium in the gas stream was about half of what would be expected for a heat source of the type D + D -> <sup>4</sup>He. Searches for ] and other energetic emissions commensurate with excess heat have uniformly produced null results.


=== Neutron radiation ===
In 2007, the ] reported their observation of pits in ] detectors during D/Pd codeposition experiments in the '']''. They said that those pits have features consistent with those observed for nuclear-generated tracks, that the Pd cathode is the source of those pits, and that they are not due to contamination or chemical reactions. They attributed some pits to knock-ons due to neutrons, and said that other pits are consistent with those obtained for ]s.<ref>{{harvnb|Mosier-Boss|Szpak|Gordon|Forsley|2007}}.</ref>


Fleischmann and Pons reported a neutron flux of 4,000 neutrons per second, as well as tritium, while the classical branching ratio for previously known fusion reactions that produce tritium would predict, with 1 Watt of power, the production of 10^12 neutrons per second, levels that would have been fatal to the researchers.<ref>{{harvnb|Simon|2002|Ref=Simon2002|p=}}, {{harvnb|Park|2000|p=}}</ref>
=== Nuclear transmutations ===
In nuclear reactions, a ] may be ] into another. There are numerous reports of nuclear transmutations and ] anomalies in cold fusion experiments.<ref name="Storms_2007_93_95">{{harvnb|Storms|2007|p=93-95}}.</ref> Cold fusion proponents say that it is generally accepted that these anomalies are not the ash associated with the primary excess heat effect.<ref name="DOE_2004_7">{{harvnb|Hagelstein et al.|2004|Ref=DOE2004|p=7}}.</ref>


The Fleischmann and Pons early findings regarding helium were later retracted<ref name="DOE_1989_24">{{harvnb|US DOE|1989|Ref=DOE1989|p=24}}</ref>, and the findings regarding neutron radiation and tritium have been retracted or discredited.{{Fact|date=April 2009}} However, neutron radiation has been reported in cold fusion experiments at very low levels using different kinds of detectors, but levels were too low, close to background, and found too infrequently to provide useful information about possible nuclear processes.<ref>{{harvnb|Storms|2007|Ref=Storms2007|p=151}}</ref><ref>{{harvnb|Hoffman|1994|Ref=Hoffman|p=111-112}}</ref> However, energetic neutrons were also reported in 2008 by Mosier-Boss et al, using ] plastic radiation detectors.<ref name=mosier-boss2009>{{harvnb|Mosier-Boss|Szpak|Gordon|Forsley|2009}}</ref>
Tadahiko Mizuno was among the first to contribute a paper<ref>{{harvnb|Mizuno|1996}}</ref> and a book on the subject.<ref>{{harvnb|Mizuno|1998}}, cited by {{harvnb|Britz|2008}}</ref> Dr. Miley, who also developed a process for making small ] devices to serve as portable fusion neutron sources,<ref>{{harvnb|Prow|2001}}.</ref> wrote a review of these experiments.<ref name="MileyShrestha_2003_?#1">{{harvnb|Miley|Shrestha|2003}}</ref> Some report the creation of only a few elements, while others report a wide variety of elements from the ]. Calcium, copper, zinc, and iron were the most commonly reported elements, often with ].<ref name="MileyShrestha_2003_?#2">{{harvnb|Miley|Shrestha|2003}}.</ref>


=== Evidence for nuclear transmutations ===
Iwamura and associates published what they say to be further evidence of transmutations in the ''Japanese Journal of Applied Physics'' in 2002.<ref name="IwamuraSakanoItoh_2002_full">{{harvnb|Iwamura|Sakano|Itoh|2002|pp=4642-4650}}.</ref> Instead of using electrolysis, they forced deuterium gas to ] through a thin layer of ] or ] deposited on ] and palladium, while periodically analyzing the nature of the surface through ]. They said that as the deuterium gas permeated over a period of a week, cesium appeared to be progressively transmuted into ] while strontium appeared to be transmuted into ] with anomalous isotopic composition representing an addition of four deuterium nuclei to the original nuclide. When the deuterium gas was replaced by hydrogen in control experiments, no transmutation was reported to be observed. The authors said that they analyzed, and then rejected, the possibility of explaining these various observations by contaminations or migration of impurities from the palladium interior.<ref name="IwamuraSakanoItoh_2002_4648">{{harvnb|Iwamura|Sakano|Itoh|2002|p=4648-4649}}.</ref>
There have been reports that small amounts of copper and other metals can appear within Pd electrodes used in cold fusion experiments.<ref>{{harvnb|Storms|2007|p=93-95}}</ref> Iwamura et al. report transmuting Cs to Pr and Sr to Mo, with the mass number increasing by 8, and the atomic number by 4 in either case.<ref name="IwamuraSakanoItoh_2002_full">{{harvnb|Iwamura|Sakano|Itoh|2002|pp=4642-4650}}</ref>. Cs or Sr was applied to the surface of a Pd complex consisting of a thin Pd layer, alternating CaO and Pd layers, and bulk Pd. Deuterium was diffused through this complex. The surface was analyzed periodically with ] and at the end of the experiment with glow discharge mass spectrometry.<ref name="IwamuraSakanoItoh_2002_full"/> Production of such heavy nuclei is so unexpected from current understanding of nuclear reactions that extraordinary experimental proof will be needed to convince the scientific community of these results.<ref name="saeta1999 p 2"/>


===Non-nuclear explanations for excess heat===
== Criticism ==
The calculation of excess heat in electrochemical cells involves certain assumptions.<ref>{{harvnb|Biberian|2007}} - (Input power is calculated by multiplying current and voltage, and output power is deduced from the measurement of the temperature of the cell and that of the bath")</ref> Errors in these assumptions have been offered as non-nuclear explanations for excess heat.
In the original 1989 DOE review<ref name="DOE_1989_6_8">{{harvnb|US DOE|1989|Ref=DOE1989|pp=6-8}}</ref>, skepticism towards cold fusion focused on four issues: the precision of calorimetry, the lack of consistently reproducible results, the absence of nuclear products in quantities consistent with the excess heat, and the lack of a mainstream theoretical mechanism. In the subsequent years considerable efforts have been made on these fronts, but today some issues still remain and some new ones have arisen.


One assumption made by Fleishmann and Pons is the efficiency of electrolysis is nearly 100%, meaning they assumed nearly all the electricity applied to the cell resulted in electrolysis of water, with negligible resistive heating and substantially all the electrolysis product leaving the cell unchanged.<ref>{{harvnb|Fleishmann|1990}}</ref> This assumption gives the amount of energy expended converting liquid D<sub>2</sub>O into gaseous D<sub>2</sub> and O<sub>2</sub>.<ref>{{harvnb|Fleishmann|1990|loc=Appendix}}</ref>
=== Precision of calorimetry ===
{{main|Calorimetry in cold fusion experiments}}
In the first years after the Fleishmann-Pons announcement various challenges were put forth. The efficacy of the stirring method in the Fleischmann-Pons experiment, and thus the validity of the temperature measurements was disputed by Browne. <ref name="Browne_1989_para16">{{harvnb|Browne|1989|loc=para. 16}}</ref> The experiment was also been criticized by Wilson..<ref name="Wilson_1992">{{harvnb|Wilson|1992}}</ref> The possibility that electrochemically mediated deuterium-oxygen recombination can cause the appearance of excess heat was discussed by Shkedi<ref name="ShkediMcDonaldBreenMaguireVeranth_1995_?">{{harvnb|Shkedi et al.|1995|Ref=Shkedi1995}}</ref> and Jones.<ref name="JonesHansenJonesSheltonThorne_1995_1">{{harvnb|Jones et al.|1995|Ref=Jones1995|p=1}}</ref>


The efficiency of electrolysis will be less than one if hydrogen and oxygen recombine to a significant extent within the calorimeter. Several researchers have described potential mechanisms by which this process could occur and thereby account for excess heat in electrolyis experiments.<ref name="ShkediMcDonaldBreenMaguireVeranth_1995_?">{{harvnb|Shkedi et al.|1995|Ref=Shkedi1995}}</ref><ref name="JonesHansenJonesSheltonThorne_1995_1">{{harvnb|Jones et al.|1995|Ref=Jones1995|p=1}}</ref><ref name="Shanahan 2002">{{harvnb|Shanahan|2002}}</ref>
The 2004 DOE panel noted that significant progress has been made in the sophistication of calorimeters since 1989. Evaluations by the reviewers ranged from: 1) evidence for excess power is compelling, to 2) there is no convincing evidence that excess power is produced when integrated over the life of an experiment. The reviewers were split approximately evenly on this topic. <ref name="DOEr_2004_3">{{harvnb|US DOE|2004|Ref=DOE2004r|p=3}}</ref>


Another assumption is that heat loss from the calorimeter maintains the same relationship with measured temperature as found when calibrating the calorimeter.<ref>{{harvnb|Fleishmann|1990}},
Many of the reviewers noted that poor experiment design, documentation, background control and other similar issues hampered the understanding and interpretation of the results presented to the DOE panel. The reviewers who did not find the production of excess power convincing said that excess power in the short term is not the same as net energy production over the entire time of an experiment, that such short-term excess power is only a few percent of the total external power applied and hence ] and systematic effects could account for the purported effect, that all possible chemical and solid state causes of excess heat had not been investigated and eliminated as an explanation, that the ] of the effect had not increased after over a decade of work.
</ref> This assumption ceases to be accurate if the temperature distribution within the cell becomes significantly altered from the condition under which calibration measurements were made.<ref>{{harvnb|Biberian|2007}} - ("Almost all the heat is dissipated by radiation and follows the temperature fourth power law. The cell is calibrated . . .")</ref> This can happen, for example, if fluid circulation within the cell becomes significantly altered.<ref name="Browne_1989_para16">{{harvnb|Browne|1989|loc=para. 16}}</ref><ref name="Wilson_1992">{{harvnb|Wilson|1992}}</ref> Recombination of hydrogen and oxygen within the calorimeter would also alter the heat distribution and invalidate the calibration.<ref name="Shanahan 2002"/><ref name="Shanahan 2005">{{harvnb|Shanahan|2005}}</ref><ref name="Shanahan 2006">{{harvnb|Shanahan|2006}}</ref>


==Discussion==
=== Accuracy of calorimetry ===
===Lack of accepted explanation using conventional physics===
In 2002, a new concept <ref>{{harvnb|Shanahan|2002}}</ref> was advanced that speculated the apparent excess heat signals were arising from a systematic error called the calibration constant shift (CCS). Dr. E. Storms<ref>{{harvnb|Storms|2000}}</ref> conducted classic Pons-Fleischmann (P-F) cell cold fusion experiments with a platinum cathode instead of the normal palladium cathode, and reported to have produced up to 780 mW of excess power. The effect was highly reproducible within the study, and raw data was supplied to interested scientists.


Postulating cold fusion to explain experimental results raises at least three separate theoretical problems.<ref>{{harvnb|Schaffer|1999|Ref=Saeta1999|p=1}}, {{harvnb|Scaramuzzi|2000|Ref=Scaramuzzi_2000|p=4}} ("It has been said . . . three 'miracles' are necessary")</ref>
Shanahan <ref>{{harvnb|Shanahan|2002}}</ref> reanalyzed that data under the assumption that no excess power was in fact present, and found that a minor (1-3%) change in the calorimeter calibration constants was all that was required to explain the apparent excess power. A 1%RSD (relative standard deviation) technique represents an excellent chemical analysis tool, thus the CCS is a residual error in a high quality technique (calorimetry). Shanahan also proposed that the cause of the shift was a redistribution of heat in the apparatus, which is similar to one of the earlier complaints against Fleischmann-Pons type of calorimetry (single point temperature measurement being suceptible to hot spots). Shanahan further speculated that such a redistribution might arise from unexpected hydrogen-oxygen recombination at the electrode.
====1.- The probability of reaction====
Because nuclei are all positively charged, they strongly repel one another.<ref>{{harvnb|Schaffer|1999|Ref=Saeta1999|p=1}}</ref> Normally, in the absence of a catalyst such as a muon, very high kinetic energies are required to overcome this repulsion.<ref>{{harvnb|Schaffer and Morrison|1999|Ref=Saeta1999|p=1,3}}</ref> Extrapolating from known rates at high energies, the rate for uncatalyzed fusion at room-temperature energy would be 50 orders of magnitude lower than needed to account for the reported excess heat.<ref>{{harvnb|Scaramuzzi|2000|Ref=Scaramuzzi_2000|p=4}}, {{harvnb|Goodstein|1994}}, {{harvnb|Huizenga|1993}} page viii "''Enhancing the probability of a nuclear reaction by 50 orders of magnitude (...) via the chemical environment of a metallic lattice, contradicted the very foundation of nuclear science''"</ref>


====2.- The branching ratio====
Four years later, Storms responded to the critique. <ref>{{harvnb|Storms|2006}}</ref>. The rebuttal focused exclusively on the speculative chemical mechanism that might produce the CCS, and not on the mathematics of the CCS itself. Shanahan <ref>{{harvnb|Shanahan|2006}}</ref> responded to all points in a back-to-back publication.
Fusion is a two-step process.<ref>{{harvnb|Schaffer|1999|Ref=Saeta1999|p=1}}, {{harvnb|Scaramuzzi|2000|Ref=Scaramuzzi_2000|p=4}}, {{harvnb|Goodstein|1994}}</ref> In the case of deuterium fusion, the first step is combination to form a high energy intermediary:
:D + D → <sup>4</sup>He + 24 ]
In high energy experiments, this intermediary has been observed to quickly decay through three pathways:<ref>{{harvnb|Schaffer|1999|Ref=Saeta1999|p=2}}, {{harvnb|Scaramuzzi|2000|Ref=Scaramuzzi_2000|p=4}}</ref>
:n + <sup>3</sup>He + 3.3 MeV (50%)
:p + <sup>3</sup>H + 4.0 MeV (50%)
:<sup>4</sup>He + γ + 24 MeV (10<sup>-6</sup>)
The first two pathways are equally probable, while the third one happened very slowly when compared with the other two.<ref name="saeta1999 p 2"/> If one watt of nuclear power were produced, the neutron and tritium production from the first two pathways would be easy to measure.<ref name="saeta1999 p 2"/> Neutrons and tritium (<sup>3</sup>H) were not being detected at levels commensurate with claimed heat, while some researchers have detected <sup>4</sup>He</ref>; to achieve this result the rates of the first two pathways would have to be at least five orders of magnitude lower than observed in other experiments<ref>{{harvnb|Schaffer|1999|Ref=Saeta1999|p=2}}, {{harvnb|Scaramuzzi|2000|Ref=Scaramuzzi_2000|p=4}} , {{harvnb|Goodstein|1994}} (explaining Pons and Fleischmann would both be dead if they had produced neutrons in proportion to their measurements of excess heat)</ref>


==== 3.- Conversion of γ-rays to heat ====
Storms said that his published rebuttal removed all concerns regarding this kind of error. Storms examines a calorimeter with a heat recovery of 98.7%, which is a very good calorimeter. He asserts that, using that calorimeter, the observation of no more than 1.2% difference between a Joule heater calibration conducted when no electrolysis was occurring (meaning that no recombination could be occurring) and an eletrolytic heating calibration performed when electrolysis was in progress proves that the CCS is not active.<ref name="Storms_2007_41">{{harvnb|Storms|2007|p=41}}</ref> Storms also says that a Seebeck calorimeter is immune to this problem.<ref name="Storms_2007_172">{{harvnb|Storms|2007|p=172}}</ref>
The ]s of the <sup>4</sup>He pathway are not observed.<ref name="saeta1999 p 2"/>. It has been proposed that the 24 MeV excess energy is transferred in the form of heat into the host metal lattice prior to the intermediary's decay.<ref>{{harvnb|Schaffer|1999|Ref=Saeta1999|p=2}}, {{harvnb|Scaramuzzi|2000|Ref=Scaramuzzi_2000|p=4}}</ref> However, the speed of the decay process together with the inter-atomic spacing in a ] makes such a transfer inexplicable in terms of conventional understandings of momentum and energy transfer.<ref>{{harvnb|Goodstein|1994}}, {{harvnb|Scaramuzzi|2000|Ref=Scaramuzzi_2000|p=4}} </ref>


===Proposed explanations===
Shanahan’s response <ref>{{harvnb|Shanahan|2006}}</ref> included a breakdown of the 10 experimental runs analyzed into 4 sets based on what seemed to be a clear time-dependent shift in the calibration constants. This time dependence suggests a chemical aging effect that can be reversed by appropriate in-cell processing, further emphasizing the non-nuclear nature proposed by Shanahan.
According to Storms (2007), no published theory has been able to meet all the requirements of basic physical principles, while adequately explaining the experimental results he considers established or otherwise worthy of theoretical consideration.<ref>{{harvnb|Storms|2007|p=173}}</ref>


====Experimental error====
=== Lack of reproducibility of excess heat ===
Many groups trying to replicate Fleischmann and Pons' results found alternative explanations for their original positive results, like problems in the neutron detector in the case of Georgia Tech or bad wiring in the thermometers at Texas A&amp;M.<ref name="derry">{{cite book | title=What Science Is and How It Works | author=] | edition=reprint, illustrated | editor=] | year=2002 | isbn =0691095507 | pages=179,180 | url=http://books.google.com/books?id=H7gjz-b7S9IC&pg=PA179&dq=cold+fusion+explanation }}</ref> The replication effort in 1989 at ] found that an apparent excess heat was caused by failure to stir the electrolyte<ref>Lewis, N., et al, Searches for low-temperature nuclear fusion of deuterium in palladium, Nature, 340:525-528, cited in Simon (2002)</ref>; however, Fleischmann later responded that his original experiments had been adequately stirred by the bubbles of evolved deuterium gas, as shown by dye diffusion.<ref>Lindley, D., 1989, ''Cold fusion: still no certainty,'' Nature 339:84, cited in Simon (2002)</ref> Positive cold fusion results, when not retracted, have been widely considered to be explainable by undiscovered experimental error, and in some cases, errors were discovered or reasonably postulated.<ref>{{cite book | title=Philosophy of Science: Alexander Bird | author=Alexander Bird | edition=illustrated, reprint | editor=] | year=1998 |isbn=1857285042 | pages=261-262 | url=http://books.google.com/books?id=czUjWnpAnUQC&pg=PA261&dq=cold+fusion+explanation+neutrons+excess+heat+wiring }}</ref>
In 1989, the DOE panel noted that "Even a single short but valid cold fusion period would be revolutionary. As a result, it is difficult convincingly to resolve all cold fusion claims since, for example, any good experiment that fails to find cold fusion can be discounted as merely not working for unknown reasons." <ref name="DOE_1989_36">{{harvnb|US DOE|1989|Ref=DOE1989|p=36}}</ref>.


Among those who continue to believe claims of Cold Fusion are not attributable to error, some possible theoretical interpretations of the experimental results have been proposed.<ref name="derry"/> As of 2002, according to Gregory Neil Derry, they were all ] explanations that didn't explain coherently the given result, they were backed by experiments that were of low quality or non reproducible, and more careful experiments to test them had given negative results; these explanations had failed to convince the mainstream scientific community.<ref name="derry"/> Since cold fusion is such an extraordinary claim, most scientists would not be convinced unless either high-quality convincing data or a compelling theoretical explanation were to be found.<ref>{{harvnb|Heeter|1999|Ref=Saeta1999|p=5}}</ref>
The cold fusion researchers who presented their review document to the 2004 DOE panel on cold fusion said that the observation of excess heat has been reproduced, that it can be reproduced at will under the proper conditions, and that many of the reasons for failure to reproduce it have been discovered.<ref name="DOE_2004_14">{{harvnb|Hagelstein et al.|2004|Ref=DOE2004|p=14}}</ref> Contrary to these assertions, most reviewers stated that the effects are not repeatable, the magnitude of the effect has not increased in over a decade of work, and that many of the reported experiments were not well documented. <ref name="DOE_2004_3">{{harvnb|US DOE|2004|Ref=DOE2004r|p=3}}.</ref>


====Theory of <sup>8</sup>Be intermediary, not simple d-d fusion====
=== Missing nuclear products ===
The fusion of two ] nuclei usually produces either a ] nucleus and a ], or a ] (<sup>3</sup>He) nucleus and a ]. The level of neutrons, tritium and <sup>3</sup>He actually observed in the Fleischmann-Pons experiments have been well below the level expected in view of the heat generated, implying that these fusion reactions cannot explain it. If the excess heat were generated by the fusion of two deuterium nuclei into helium (4He), a reaction which is normally extremely rare, ]s and helium (alpha particles) would be expected. In 1989, insufficient levels of helium (alpha particles) and gamma rays were observed to explain the excess heat. .<ref name="DOE_1989_5_6">{{harvnb|US DOE|1989|Ref=DOE1989|pp=5-6}}.</ref>


Outside of mainstream-accepted explanations , cold fusion researchers have proposed a number of different possible fusion pathways other than deuterium-deuterium fusion, but most of them produce too little energy per resulting helium nucleus to explain the excess heat claims of 25±5 MeV/<sup>4</sup>He.<ref>{{harvnb|Storms|2007|p=180}}</ref> One that predicts this energy has been advanced by Takahashi, that four deuterons condense to make ], which quickly decays to two alpha particles, each with 23.8 MeV.<ref>Takahashi, A., Deuteron cluster fusion and ash, in , Asti, Italy, 2004, cited in {{harvnb|Storms|2007|p=180}}</ref><ref>He Jing-tang, ''Nuclear fusion inside condense matters,'' Front. Phys. China (2007) 1: 96―102</ref><<ref>{{harvnb|Marwan|2008|pp. 57-83}} Akito Takahashi and Norio Yabuuchi, ''Study on 4D/Tetrahedral Symmetric Condensate condensation motion by non-linear laangevin equation</ref>
New information was presented in 2004 to the DOE review panel regarding the production of <sup>4</sup>He .<ref name="DOE_2004">{{harvnb|Hagelstein et al.|2004|Ref=DOE2004}}.</ref>. When members of the panel were asked about the evidence of low energy nuclear reactions, twelve of the eighteen did not feel that there was any conclusive evidence, five found the evidence "somewhat convincing", and one was entirely convinced. The evidence of D+D fusion was taken as convincing or somewhat convincing by some reviewers; for others the lack of consistency was an indication that the overall hypothesis was not justified. Contamination of apparatus or samples by air containing 4He was cited as one possible cause for false positive results in some measurements. <ref name="DOE_2004_3">{{harvnb|US DOE|2004|Ref=DOE2004r|p=3}}.</ref>
====] (Deuterino) theory====
{{main|Blacklight Power}}
Mills (2006) has suggested that electrons can occupy energy levels lower than previously understood, but that under normal conditions, a barrier exists to prevent transitions to such a reduced energy state. Mills postulates that some atoms with an appropriate available energy level can catalyze the transition of electrons to this state. If an electron has reached a sufficiently collapsed state, this electron may then shield two deuterons similarly to ], allowing the nuclei to approach and fuse, and the electron could then be emitted as a prompt beta particle, thus explaining the lack of gamma radiation and conserving momentum.<ref>Alok Jha, , ], Nov. 4, 2005, for background</ref><ref>William J. Broad, , ], April 26, 1991, claims "ultradense hydrogen"</ref><ref>R.L. Mills and S.P. Kneizys, ''Excess heat production by the electrolysis of an aqueous potassium carbonate electrolyte and the implications for cold fusion,'' ], 20, pp. 65-81 (1991).</ref>


Mills' explanation of Classical Quantum Mechanics and hydrinos has been doubted in the literature<ref name="Rathke">
An example of this was published by Clarke et al. in 2003. <ref>{{harvnb|Clarke|2003}}</ref>. Their paper reported on the analysis of gases found in four ‘Case-type’ cells obtained from the McKubre group at SRI International, a primary cold fusion research group. The Abstract states: “One sample appears to be identical in composition to air, and the other three have been seriously affected by leak(s) into and from the SRI cells.” and “These results have obvious implications concerning the validity of the excess 4He concentrations claimed by Case and the SRI researchers.”
{{cite journal
|last=Rathke
|year=2005
|month=May
|title=A critical analysis of the hydrino model
|journal= New Journal of Physics
|volume= 2005
|issue= 7
|pages= 127
|doi=10.1088/1367-2630/7/1/127
}}</ref> and is not accepted by most experts in the field nor by mainstream science,<ref name=ieee>
{{cite news
|title= Loser: Hot or Not?
|author= Erico Guizzo
|work= ]
|date= January 2009
|url= http://www.spectrum.ieee.org/print/7127
}} (part of , by Philip E. Ross in the same publication)
</ref><ref name=nyt2008>
{{cite news
|title= Blacklight Power bolsters its impossible claims of a new renewable energy source
|author=Morrison, Chris
|date= 2008-10-21
|work= ]
|url= http://www.nytimes.com/external/venturebeat/2008/10/21/21venturebeat-blacklight-power-bolsters-its-impossible-cla-99377.html
}}</ref><ref name=crimsom>
{{cite news
|url=http://www.thecrimson.com/article.aspx?ref=100939
|author=Jacqueline A. Newmyer
|title=Academics Question The Science Behind BlackLight Power, Inc.
|publisher=]
|date=May 17, 2000
|accessdate=February 10, 2009
}}</ref> His critics say that, although he has published theory papers in peer-reviewed journals, he has published only in those dealing with speculative work.<ref name=ieee/> They also say that he hasn't addressed several deep flaws in his theory.<ref name=ieee/>


==See also==
=== Lack of theoretical explanations ===
* ]
Temperatures and pressures similar to those in ]s are required for conventional nuclear fusion. The 1989 DOE panel said that such "nuclear fusion at room temperature would be contrary to all understanding gained of nuclear reactions in the last half century" and "it would require the invention of an entirely new nuclear process." <ref name="DOE_1989_37">{{harvnb|US DOE|1989|Ref=DOE1989|p=37}}.</ref> but it also recognized that "the failure of a theory to account for cold fusion can be discounted on the grounds that the correct explanation and theory has not been provided",<ref name="DOE_1989_36">{{harvnb|US DOE|1989|Ref=DOE1989|p=36}}.</ref> that is, the lack of a satisfactory explanation could not be used to dismiss experimental evidence.
* ]

* ]
Cold fusion observations are contrary to the conventional physics of nuclear fusion in several ways :
* ], newsletter
* The average density of deuterium atoms in the palladium rod seems vastly insufficient to force pairs of nuclei close enough for fusion to occur according to mechanisms known to mainstream theories. The average distance is approximately 0.17 ]s, a distance at which the attractive ] cannot overcome the ]. Deuterium atoms are closer together in D<sub>2</sub> gas molecules, which do not exhibit fusion.<ref name="DOE_1989_6_7">{{harvnb|US DOE|1989|Ref=DOE1989|pp=6-7}}.</ref>
* ], magazine
* There is no known mechanism that would release fusion energy as heat instead of radiation within the relatively small metal lattice.<ref name="Goodstein_1994_528">{{harvnb|Goodstein|1994|p=528}}.</ref> The direct conversion of fusion energy into heat is not possible because of energy and ] conservation and the laws of ].<ref name="Kee_1999_5">{{harvnb|Kee|1999|p=5}}.</ref>
* Transmutations introduce additional discrepancies between observations and conventional theory because of the increased Coulomb barrier.

Cold fusion researchers acknowledge these issues and have proposed various speculative theories (for a full review, see {{harvnb|Storms|2007}}) to explain the reported observations, but none has received mainstream acceptance.<ref name="Biberian_2007">{{harvnb|Biberian|2007}}</ref>

== Notes ==
{{refbegin}}
* '''α'''.{{Note_label|heat_tritium_reports|α|none}} References to publications are listed in {{harvnb|Storms|2007|pp=52-61,79-81}} and in {{harvnb|Hagelstein et al.|2004|Ref=DOE2004|pp=25-29}}, to include {{harvnb|Arata|Zhang|1998}}, {{harvnb|Iwamura|Sakano|Itoh|2002}}, {{harvnb|Mizuno|Ohmori|Akimoto|Takahashi|2000}}, {{harvnb|Miles et al.|1993|Ref=MilesEtAl1993}} and {{harvnb|Bush|Lagowski|Miles|Ostrom|1991}}. Electrochemist , who has remained neutral on the question of whether cold fusion exists,<!-- http://groups.google.com/group/sci.physics.fusion/msg/cd82ea9f80a813c0 --> has compiled which includes numerous published scientific journal articles marked "res+", indicating positive research results or supportive theoretical calculations.
{{refend}}


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==External links==
{{refend}}
*American Chemical Society, 273rd Annual Meeting, March 23, 2009, Press Conference on "Cold Fusion Rebirth." (video) , .
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* (video) April 24, 2009


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Revision as of 02:54, 1 June 2009

This article is about the Fleischmann-Pons claims. For accepted examples of fusion at temperatures below the millions of degrees Celsius required for thermonuclear fusion, see nuclear fusion. For a specific example of an accepted mechanism for low-temperature fusion, sometimes referred to as cold fusion, see muon-catalyzed fusion. For all other definitions, see cold fusion (disambiguation).
Diagram of an open type calorimeter used at the New Hydrogen Energy Institute in Japan.

Cold fusion (sometimes referred to as low energy nuclear reaction (LENR) studies or condensed matter nuclear science) refers to a postulated nuclear fusion process of unknown mechanism offered to explain a group of disputed experimental results first reported by electrochemists Martin Fleischmann and Stanley Pons.

Cold fusion, under this definition, was only first announced on March 23, 1989 when Fleischmann and Pons reported producing nuclear fusion in a tabletop experiment involving electrolysis of heavy water on a palladium (Pd) electrode. They reported anomalous heat production ("excess heat") of a magnitude they asserted would defy explanation except in terms of nuclear processes. They further reported measuring small amounts of nuclear reaction byproducts, including neutrons and tritium. These reports raised hopes of a cheap and abundant source of energy.

Enthusiasm turned to skepticism as replication failures were weighed in view of several theoretical reasons cold fusion should not be possible, the discovery of possible sources of experimental error, and finally the discovery that Fleischmann and Pons had not actually detected nuclear reaction byproducts. By late 1989, most physicists considered cold fusion claims dead, and cold fusion subsequently gained a reputation as pathological science. However, some researchers continue to investigate cold fusion and publish their findings at conferences, in books, and scientific journals.

There have been few mainstream reviews of the field since 1990. In 1989, the majority of a review panel organized by the US Department of Energy (DOE) had found that the evidence for the discovery of a new nuclear process was not persuasive. A second DOE review, convened in 2004 to look at new research, reached conclusions that were similar to those of the 1989 panel.

History

Early work

The ability of palladium to absorb hydrogen was recognized as early as the nineteenth century by Thomas Graham. In the late nineteen-twenties, two Austrian born scientists, Friedrich Paneth and Kurt Peters, originally reported the transformation of hydrogen into helium by spontaneous nuclear catalysis when hydrogen was absorbed by finely divided palladium at room temperature. However, the authors later retracted that report, acknowledging that the helium they measured was due to background from the air.

In 1927, Swedish scientist J. Tandberg stated that he had fused hydrogen into helium in an electrolytic cell with palladium electrodes. On the basis of his work, he applied for a Swedish patent for "a method to produce helium and useful reaction energy". After deuterium was discovered in 1932, Tandberg continued his experiments with heavy water. Due to Paneth and Peters' retraction, Tandberg's patent application was eventually denied.

The term "cold fusion" was used as early as 1956 in a New York Times article about Luis W. Alvarez' work on muon-catalyzed fusion.

E. Paul Palmer of Brigham Young University also used the term "cold fusion" in 1986 in an investigation of "geo-fusion", or the possible existence of fusion in a planetary core.

Fleischmann-Pons announcement

Electrolysis cell schematic

Martin Fleischmann of the University of Southampton and Stanley Pons of the University of Utah hypothesized that the high compression ratio and mobility of deuterium that could be achieved within palladium metal using electrolysis might result in nuclear fusion. To investigate, they conducted electrolysis experiments using a palladium cathode and heavy water within a calorimeter, an insulated vessel designed to measure process heat. Current was applied continuously for many weeks, with the heavy water being renewed at intervals. Some deuterium was thought to be accumulating within the cathode, but most was allowed to bubble out of the cell, joining oxygen produced at the anode. For most of the time, the power input to the cell was equal to the calculated power leaving the cell within measurement accuracy, and the cell temperature was stable at around 30 °C. But then, at some point (and in some of the experiments), the temperature rose suddenly to about 50 °C without changes in the input power. These high temperature phases would last for two days or more and would repeat several times in any given experiment once they had occurred. The calculated power leaving the cell was significantly higher than the input power during these high temperature phases. Eventually the high temperature phases would no longer occur within a particular cell.

In 1988, Fleischmann and Pons applied to the United States Department of Energy for funding towards a larger series of experiments. Up to this point they had been funding their experiments using a small device built with $100,000 out-of-pocket. The grant proposal was turned over for peer review, and one of the reviewers was Steven E. Jones of Brigham Young University. Jones had worked for some time on muon-catalyzed fusion, a known method of inducing nuclear fusion without high temperatures, and had written an article on the topic entitled "Cold nuclear fusion" that had been published in Scientific American in July 1987. Fleischmann and Pons and co-workers met with Jones and co-workers on occasion in Utah to share research and techniques. During this time, Fleischmann and Pons described their experiments as generating considerable "excess energy", in the sense that it could not be explained by chemical reactions alone. They felt that such a discovery could bear significant commercial value and would be entitled to patent protection. Jones, however, was measuring neutron flux, which was not of commercial interest. In order to avoid problems in the future, the teams appeared to agree to simultaneously publish their results, although their accounts of their March 6 meeting differ.

In mid-March 1989, both research teams were ready to publish their findings, and Fleischmann and Jones had agreed to meet at an airport on March 24 to send their papers to Nature via FedEx. Fleischmann and Pons, however, broke their apparent agreement, submitting their paper to the Journal of Electroanalytical Chemistry on March 11, and disclosing their work via a press conference on March 23. Jones, upset, faxed in his paper to Nature after the press conference.

Reaction to the announcement

Fleischmann and Pons' announcement drew wide media attention.

Scores of laboratories in the United States and abroad attempted to repeat the experiments. A few reported success, many others failure. Even those reporting success had difficulty reproducing Fleischmann and Pons' results. One of the more prominent reports of success came from a group at the Georgia Institute of Technology, which observed neutron production. The Georgia Tech group later retracted their announcement. Another team, headed by Robert Huggins at Stanford University also reported early success, but this too was refuted. For weeks, competing claims, counterclaims and suggested explanations kept what was referred to as "cold fusion" or "fusion confusion" in the news.

In May 1989, the American Physical Society held a session on cold fusion, at which were heard many reports of experiments that failed to produce evidence of cold fusion. At the end of the session, eight of the nine leading speakers stated they considered the initial Fleischmann and Pons claim dead.

In April 1989, Fleischmann and Pons published a "preliminary note" in the Journal of Electroanalytical Chemistry. This paper notably showed a gamma peak without its corresponding Compton edge, which indicated they had made a mistake in claiming evidence of fusion byproducts. The preliminary note was followed up a year later with a much longer paper that went into details of calorimetry but did not include any nuclear measurements.

In July and November 1989, Nature published papers critical of cold fusion claims.

Nevertheless, Fleischmann and Pons and a number of other researchers who found positive results remained convinced of their findings. In August 1989, the state of Utah invested $4.5 million to create the National Cold Fusion Institute.

The United States Department of Energy organized a special panel to review cold fusion theory and research. The panel issued its report in November 1989, concluding that results as of that date did not present convincing evidence that useful sources of energy would result from phenomena attributed to cold fusion. The panel noted the inconsistency of reports of excess heat and the greater inconsistency of reports of nuclear reaction byproducts. Nuclear fusion of the type postulated would be inconsistent with current understanding and would require the invention of an entirely new nuclear process. The panel was against special funding for cold fusion research, but supported modest funding of "focused experiments within the general funding system."

In the ensuing years, several books came out critical of cold fusion research methods and the conduct of cold fusion researchers.

Further developments

Cold fusion claims were, and still are, considered extraordinary. In view of the theoretical issues alone, most scientists would require extraordinarily conclusive data to be convinced that cold fusion has been discovered. After the fiasco following the Pons and Fleischmann announcement, most scientists became dismissive of new experimental claims. The U.S. Patent and Trademark Office rejects any patent claiming cold fusion, using the same argument as with perpetual motion machines: that it doesn't work.

Nevertheless, there were positive results that kept some researchers interested and got new researchers involved. In September 1990, Fritz Will, Director of the National Cold Fusion Institute, compiled a list of 92 groups of researchers from 10 different countries that had reported excess heat, H, He, neutrons or other nuclear effects.

Fleischmann and Pons relocated their laboratory to France under a grant from the Toyota Motor Corporation. The laboratory, IMRA, was closed in 1998 after spending £12 million on cold fusion work.

Between 1992 and 1997, Japan's Ministry of International Trade and Industry sponsored a "New Hydrogen Energy Program" of US$20 million to research cold fusion. Announcing the end of the program in 1997, Hideo Ikegami stated "We couldn't achieve what was first claimed in terms of cold fusion." He added, "We can't find any reason to propose more money for the coming year or for the future."

In 1994, David Goodstein described cold fusion as "a pariah field, cast out by the scientific establishment. Between cold fusion and respectable science there is virtually no communication at all. Cold fusion papers are almost never published in refereed scientific journals, with the result that those works don't receive the normal critical scrutiny that science requires. On the other hand, because the Cold-Fusioners see themselves as a community under siege, there is little internal criticism. Experiments and theories tend to be accepted at face value, for fear of providing even more fuel for external critics, if anyone outside the group was bothering to listen. In these circumstances, crackpots flourish, making matters worse for those who believe that there is serious science going on here."

In some cases, cold fusion researchers contend that cold fusion research is being suppressed. They complained there was virtually no possibility of obtaining funding for cold fusion research in the United States, and no possibility of getting published. University researchers were unwilling to investigate cold fusion because they would be ridiculed by their colleagues. In a biography by Jagdish Mehra et al. it is mentioned that to the shock of most physicists, the Nobel Laureate Julian Schwinger declared himself a supporter of cold fusion and tried to publish a paper on it in Physical Review Letters; when it was roundly rejected, in a manner that he considered deeply insulting, he resigned from that body in protest.

To provide a forum for researchers to share their results, the first International Conference on Cold Fusion was held in 1990. The conference, recently renamed the International Conference on Condensed Matter Nuclear Science, is held every 12 to 18 months in various countries around the world. The periodicals Fusion Facts, Cold Fusion Magazine, Infinite Energy Magazine, and New Energy Times were established in the 1990s to cover developments in cold fusion and related new energy sciences. In 2004 The International Society for Condensed Matter Nuclear Science (ISCMNS) was formed "To promote the understanding, development and application of Condensed Matter Nuclear Science for the benefit of the public."

In the 1990s, India stopped its research in cold fusion due to the lack of consensus among mainstream scientists and the US denunciation of it. It was later resumed in 2008 (see below).

In February 2002, the U.S. Navy revealed that its researchers had been quietly studying cold fusion continually since 1989. Researchers at their Space and Naval Warfare Systems Center in San Diego, California released a two-volume report, entitled "Thermal and nuclear aspects of the Pd/D2O system," with a plea for proper funding.

In 2004, at the request of cold fusion advocates, the DOE organized a second review of the field. Cold fusion researchers presented a review document stating that the observation of excess heat has been reproduced, that it can be reproduced at will under the proper conditions, and that many of the reasons for failure to reproduce it have been discovered.

18 reviewers in total examined the written and oral testimony given by cold fusion researchers. On the question of excess heat, the reviewers' opinions ranged from "evidence of excess heat is compelling" to "there is no convincing evidence that excess power is produced when integrated over the life of an experiment". The report states the reviewers were split approximately evenly on this topic. On the question of evidence for nuclear fusion, the report states:

Two-thirds of the reviewers...did not feel the evidence was conclusive for low energy nuclear reactions, one found the evidence convincing, and the remainder indicated they were somewhat convinced. Many reviewers noted that poor experiment design, documentation, background control and other similar issues hampered the understanding and interpretation of the results presented.

On the question of further research, the report reads:

The nearly unanimous opinion of the reviewers was that funding agencies should entertain individual, well-designed proposals for experiments that address specific scientific issues relevant to the question of whether or not there is anomalous energy production in Pd/D systems, or whether or not D-D fusion reactions occur at energies on the order of a few eV. These proposals should meet accepted scientific standards, and undergo the rigors of peer review. No reviewer recommended a focused federally funded program for low energy nuclear reactions.

Thirteen papers were presented at the "Cold Fusion" session of the March 2006 American Physical Society (APS) meeting in Baltimore. In 2007, the American Chemical Society's (ACS) held an "invited symposium" on cold fusion and low-energy nuclear reactions. Cold fusion reports have been published in Naturwissenschaften, Japanese Journal of Applied Physics, European Physical Journal A, European Physical Journal C, International Journal of Hydrogen Energy, Journal of Solid State Phenomena, Journal of Electroanalytical Chemistry, and Journal of Fusion Energy.

Cold fusion researchers have described possible cold fusion mechanisms, but they have not received mainstream acceptance. Physics Today said, in 2005, that new reports of excess heat and other cold fusion effects were still no more convincing than 15 years ago. 20 years later, in 2009, cold fusion researchers complain that the flaws in the original announcement still cause the field to be marginalized and to suffer a chronic lack of funding. Frank Close claims that a problem plaguing the original announcement is still happening: results from studies are still not being independently verified, and that inexplicable phenomena encountered in the last twenty years are being labeled as "cold fusion" even if they aren't, in order to attract attention from journalists. A number of researchers keep researching and publishing in the field, working under the name of low-energy nuclear reactions, or LENR, in order to avoid the negative connotations of the "cold fusion" label.

Research in India started again in 2008 in several centers like the Bhabha Atomic Research Centre thanks to the pressure of influential Indian scientists; the National Institute of Advanced Studies has also recommended the Indian government to revive this research.

"Triple tracks" in a CR-39 plastic radiation detector claimed as evidence for neutron emission from palladium deuteride, suggestive of a deuterium-tritium reaction

On 22–25 March 2009, the American Chemical Society held a four-day symposium on "New Energy Technology", in conjunction with the 20th anniversary of the announcement of cold fusion. At the conference, researchers with the U.S. Navy's Space and Naval Warfare Systems Center (SPAWAR) reported detection of energetic neutrons in a palladium-deuterium co-deposition cell using CR-39, a result previously published in Die Naturwissenschaften. Neutrons are indicative of nuclear reactions.

Experimental details

A cold fusion experiment usually includes:

Electrolysis cells can be either open cell or closed cell. In open cell systems, the electrolyis products, which are gaseous, are allowed to leave the cell. In closed cell experiments, the products are captured, for example by catalytically recombining the products in a separate part of the experimental system. These experiments generally strive for a steady state condition, with the electrolyte being replaced periodically. There are also "heat after death" experiments, where the evolution of heat is monitored after the electric current is turned off.

Excess heat observations

An excess heat observation is based on an energy balance. Various sources of energy input and output are continuously measured. Under normal condition, the energy input can be matched to the energy output to within experimental error. In experiments such as those run by Fleischmann and Pons, a cell operating steadily at one temperature transitions to operating at a higher temperature with no increase in applied current. In other experiments, however, no excess heat was discovered, and, in fact, even the heat from successful experiments was unreliable and could not be replicated independently. If higher temperatures were real, and not experimental artifact, the energy balance would show an unaccounted term. In the Fleischmann and Pons experiments, the rate of inferred excess heat generation was in the range of 10-20% of total input. The high temperature condition would last for an extended period, making the total excess heat appear to be disproportionate to what might be obtained by ordinary chemical reaction of the material contained within the cell at any one time, though this could not be reliably replicated. Many others have reported similar results.

A 2007 review determined that more than 10 groups world wide reported measurements of excess heat in 1/3 of their experiments using electrolysis of heavy water in open and/or closed electrochemical cells, or deuterium gas loading onto Pd powders under pressure. Most of the research groups reported occasionally seeing 50-200% excess heat for periods lasting hours or days.

In 1993, Fleischmann reported "heat-after-death" experiments: he observed the continuing generation of excess heat after the electric current supplied to the electrolytic cell was turned off. Similar observations have been reported by others as well.

Reports of nuclear products in association with excess heat

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Considerable attention has been given to measuring He production. In 1999 Schaffer says that the levels detected were very near to background levels, that there is the possibility of contamination by trace amounts of helium which are normally present in the air, and that the lack of detection of Gamma radiation led most of the scientific community to regard the presence of He as the result of experimental error. In the report presented to the DOE in 2004, He was detected in five out of sixteen cases where electrolytic cells were producing excess heat. The reviewers' opinion was divided on the evidence for He; some points cited were that the amounts detected were above background levels but very close to them, that it could be caused by contamination from air, and there were serious concerns about the assumptions made in the theorical framework that tried to account for the lack of gamma rays.

In 1999 several heavy elements had been detected by other researchers, specially Tadahiko Mizuno in Japan, although the presence of these elements was so unexpected from the current understanding of these reactions that Schaffer said that it would require extraordinary evidence before the scientific community accepted it. The report presented to the DOE in 2004 indicated that deuterium loaded foils could be used to detect fusion reaction products and, although the reviewers found the evidence presented to them as unconclusive, they indicated that those experiments didn't use state of the art techniques and it was a line of work that could give conclusive results on the matter..

Neutron radiation

Fleischmann and Pons reported a neutron flux of 4,000 neutrons per second, as well as tritium, while the classical branching ratio for previously known fusion reactions that produce tritium would predict, with 1 Watt of power, the production of 10^12 neutrons per second, levels that would have been fatal to the researchers.

The Fleischmann and Pons early findings regarding helium were later retracted, and the findings regarding neutron radiation and tritium have been retracted or discredited. However, neutron radiation has been reported in cold fusion experiments at very low levels using different kinds of detectors, but levels were too low, close to background, and found too infrequently to provide useful information about possible nuclear processes. However, energetic neutrons were also reported in 2008 by Mosier-Boss et al, using CR-39 plastic radiation detectors.

Evidence for nuclear transmutations

There have been reports that small amounts of copper and other metals can appear within Pd electrodes used in cold fusion experiments. Iwamura et al. report transmuting Cs to Pr and Sr to Mo, with the mass number increasing by 8, and the atomic number by 4 in either case.. Cs or Sr was applied to the surface of a Pd complex consisting of a thin Pd layer, alternating CaO and Pd layers, and bulk Pd. Deuterium was diffused through this complex. The surface was analyzed periodically with X-ray photoelectron spectroscopy and at the end of the experiment with glow discharge mass spectrometry. Production of such heavy nuclei is so unexpected from current understanding of nuclear reactions that extraordinary experimental proof will be needed to convince the scientific community of these results.

Non-nuclear explanations for excess heat

The calculation of excess heat in electrochemical cells involves certain assumptions. Errors in these assumptions have been offered as non-nuclear explanations for excess heat.

One assumption made by Fleishmann and Pons is the efficiency of electrolysis is nearly 100%, meaning they assumed nearly all the electricity applied to the cell resulted in electrolysis of water, with negligible resistive heating and substantially all the electrolysis product leaving the cell unchanged. This assumption gives the amount of energy expended converting liquid D2O into gaseous D2 and O2.

The efficiency of electrolysis will be less than one if hydrogen and oxygen recombine to a significant extent within the calorimeter. Several researchers have described potential mechanisms by which this process could occur and thereby account for excess heat in electrolyis experiments.

Another assumption is that heat loss from the calorimeter maintains the same relationship with measured temperature as found when calibrating the calorimeter. This assumption ceases to be accurate if the temperature distribution within the cell becomes significantly altered from the condition under which calibration measurements were made. This can happen, for example, if fluid circulation within the cell becomes significantly altered. Recombination of hydrogen and oxygen within the calorimeter would also alter the heat distribution and invalidate the calibration.

Discussion

Lack of accepted explanation using conventional physics

Postulating cold fusion to explain experimental results raises at least three separate theoretical problems.

1.- The probability of reaction

Because nuclei are all positively charged, they strongly repel one another. Normally, in the absence of a catalyst such as a muon, very high kinetic energies are required to overcome this repulsion. Extrapolating from known rates at high energies, the rate for uncatalyzed fusion at room-temperature energy would be 50 orders of magnitude lower than needed to account for the reported excess heat.

2.- The branching ratio

Fusion is a two-step process. In the case of deuterium fusion, the first step is combination to form a high energy intermediary:

D + D → He + 24 MeV

In high energy experiments, this intermediary has been observed to quickly decay through three pathways:

n + He + 3.3 MeV (50%)
p + H + 4.0 MeV (50%)
He + γ + 24 MeV (10)

The first two pathways are equally probable, while the third one happened very slowly when compared with the other two. If one watt of nuclear power were produced, the neutron and tritium production from the first two pathways would be easy to measure. Neutrons and tritium (H) were not being detected at levels commensurate with claimed heat, while some researchers have detected He</ref>; to achieve this result the rates of the first two pathways would have to be at least five orders of magnitude lower than observed in other experiments

3.- Conversion of γ-rays to heat

The γ-rays of the He pathway are not observed.. It has been proposed that the 24 MeV excess energy is transferred in the form of heat into the host metal lattice prior to the intermediary's decay. However, the speed of the decay process together with the inter-atomic spacing in a metallic crystal makes such a transfer inexplicable in terms of conventional understandings of momentum and energy transfer.

Proposed explanations

According to Storms (2007), no published theory has been able to meet all the requirements of basic physical principles, while adequately explaining the experimental results he considers established or otherwise worthy of theoretical consideration.

Experimental error

Many groups trying to replicate Fleischmann and Pons' results found alternative explanations for their original positive results, like problems in the neutron detector in the case of Georgia Tech or bad wiring in the thermometers at Texas A&M. The replication effort in 1989 at Caltech found that an apparent excess heat was caused by failure to stir the electrolyte; however, Fleischmann later responded that his original experiments had been adequately stirred by the bubbles of evolved deuterium gas, as shown by dye diffusion. Positive cold fusion results, when not retracted, have been widely considered to be explainable by undiscovered experimental error, and in some cases, errors were discovered or reasonably postulated.

Among those who continue to believe claims of Cold Fusion are not attributable to error, some possible theoretical interpretations of the experimental results have been proposed. As of 2002, according to Gregory Neil Derry, they were all ad hoc explanations that didn't explain coherently the given result, they were backed by experiments that were of low quality or non reproducible, and more careful experiments to test them had given negative results; these explanations had failed to convince the mainstream scientific community. Since cold fusion is such an extraordinary claim, most scientists would not be convinced unless either high-quality convincing data or a compelling theoretical explanation were to be found.

Theory of Be intermediary, not simple d-d fusion

Outside of mainstream-accepted explanations , cold fusion researchers have proposed a number of different possible fusion pathways other than deuterium-deuterium fusion, but most of them produce too little energy per resulting helium nucleus to explain the excess heat claims of 25±5 MeV/He. One that predicts this energy has been advanced by Takahashi, that four deuterons condense to make Be, which quickly decays to two alpha particles, each with 23.8 MeV.<

Hydrino (Deuterino) theory

Main article: Blacklight Power

Mills (2006) has suggested that electrons can occupy energy levels lower than previously understood, but that under normal conditions, a barrier exists to prevent transitions to such a reduced energy state. Mills postulates that some atoms with an appropriate available energy level can catalyze the transition of electrons to this state. If an electron has reached a sufficiently collapsed state, this electron may then shield two deuterons similarly to muon-catalyzed fusion, allowing the nuclei to approach and fuse, and the electron could then be emitted as a prompt beta particle, thus explaining the lack of gamma radiation and conserving momentum.

Mills' explanation of Classical Quantum Mechanics and hydrinos has been doubted in the literature and is not accepted by most experts in the field nor by mainstream science, His critics say that, although he has published theory papers in peer-reviewed journals, he has published only in those dealing with speculative work. They also say that he hasn't addressed several deep flaws in his theory.

See also

References

  1. Biberian 2007,Hagelstein et al. 2004
  2. Voss 1999
  3. Fleischmann & Pons 1989, p. 301 ("It is inconceivable that this could be due to anything but nuclear processes.")
  4. Fleischmann & Pons 1989, p. 301 ("We realise that the results reported here raise more questions than they provide answers . . .")
  5. Browne 1989, para. 1
  6. Browne 1989,Close 1992, Huizenga 1993,Taubes 1993
  7. ^ Malcolm W. Browne (1989-05-03). "Physicists Debunk Claim Of a New Kind of Fusion". The New York Times. pp. A1, A22.
  8. "US will give cold fusion a second look". New York Times. Retrieved 2009-02-08.
  9. Voss 1999,Platt 1998,Goodstein 1994,Van Noorden 2007,Beaudette 2002,Feder 2005,Hutchinson 2006,Kruglinksi 2006,Adam 2005
  10. William J. Broad (1989-10-31). "Despite Scorn, Team in Utah Still Seeks Cold-Fusion Clues". The New York Times. pp. C1.
  11. Choi 2005,Feder 2005,US DOE 2004
  12. ^ US DOE 1989, p. 7
  13. Paneth and Peters 1926
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  21. For example, in 1989, the Economist editorialized that the cold fusion "affair" was "exactly what science should be about." Michael Brooks, "13 Things That Don't Make Sense" (ISBN 978-1-60751-666-8), p. 67 (New York:Doubleday, 2008), citing J. (Jerrold) K. Footlick, "Truth and Consequences: how colleges and universities meet public crises" (ISBN 9780897749701), p. 51 (Phoenix:Oryx Press, 1997).
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  24. Broad 1989
  25. Wilford 1989
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  27. Bowen 1989
  28. Tate 1989, p. 1
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  31. Williams et al. 1989, pp. 375–384
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  36. Taubes 1993, Close 1992, Huizenga 1993, Park 2000
  37. Schaffer 1999, p. 3
  38. Schaffer 1999, p. 3, Adam 2005 - ("Extraordinary claims . . . demand extraordinary proof")
  39. Schaffer and Morrison 1999, p. 3 ("You mean it's not dead?" – recounting a typical reaction to hearing a cold fusion conference was held recently)
  40. Weinberger, Sharon (2004-11-21). "Warming Up to Cold Fusion". Washington Post: W22. (page 2 in online version)
  41. Adam 2005 - ("Advocates insist that there is just too much evidence of unusual effects in the thousands of experiments since Pons and Fleischmann to be ignored")
  42. Mallove 1991, p. 246-248
  43. Voss 1999
  44. Pollack 1997, p. C4
  45. Goodstein 1994
  46. Feder 2004, p. 27
  47. Adam 2005 (comment attributed to George Miley of the University of Illinois)
  48. Jagdish Mehra, K. A. Milton, Julian Seymour Schwinger (2000). Oxford University Press (ed.). Climbing the Mountain: The Scientific Biography of Julian Schwinger (illustrated ed.). p. 550. ISBN 0198506589.{{cite book}}: CS1 maint: multiple names: authors list (link)
  49. ^ Jayaraman 2008 harvnb error: no target: CITEREFJayaraman2008 (help)
  50. Mullins 2004
  51. Hagelstein et al. 2004, p. 3, 14
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  53. Chubb et al. 2006, Adam 2005 ("Anyone can deliver a paper. We defend the openness of science" - Bob Parks of APS, explaining that hosting the meeting does not show a softening of scepticism)
  54. Van Noorden 2007, para. 2
  55. Di Giulio 2002 harvnb error: no target: CITEREFDi_Giulio2002 (help)
  56. Biberian 2007
  57. Feder 2005
  58. ^ "Cold fusion debate heats up again". BBC. 2009-03-23.
  59. "March 23, 1989: Cold Fusion Gets Cold Shoulder". Wired. 2009-03-23.
  60. Shamoo 2003, p. 132-133
  61. ACS Press Release 'Cold fusion' rebirth? New evidence for existence of controversial energy source
  62. "Neutron tracks revive hopes for cold fusion". New Scientist. Retrieved 2009-03-24.
  63. "Scientists in possible cold fusion breakthrough". AFP. Retrieved 2009-03-24.
  64. Storms 2007, p. 144-150
  65. Fleischmann 1990 harvnb error: no target: CITEREFFleischmann1990 (help)
  66. ^ Schaffer 1999, p. 2
  67. US DOE 2004, p. 3
  68. ^ Hubler 2007
  69. Oriani et al. 1990, pp. 652–662, cited by Storms 2007, p. 61
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  72. Miles et al. 1993 harvnb error: no target: MilesE (help)
  73. e.g. Arata & Zhang 1998, Hagelstein et al. 2004
  74. Gozzi 1998, cited by Biberian 2007
  75. Fleischmann 1993
  76. Mengoli 1998
  77. Szpak 2004
  78. Hagelstein et al. 2004
  79. ^ US DOE 2004, p. 3,4
  80. US DOE 2004, p. 3,4,5
  81. Simon 2002, p. 49, Park 2000, p. 17-18
  82. US DOE 1989, p. 24
  83. Storms 2007, p. 151 harvnb error: no target: Storms2007 (help)
  84. Hoffman 1994, p. 111-112 harvnb error: no target: Hoffman (help)
  85. Mosier-Boss et al. 2009
  86. Storms 2007, p. 93-95
  87. ^ Iwamura, Sakano & Itoh 2002, pp. 4642–4650
  88. Biberian 2007 - (Input power is calculated by multiplying current and voltage, and output power is deduced from the measurement of the temperature of the cell and that of the bath")
  89. Fleishmann 1990 harvnb error: no target: CITEREFFleishmann1990 (help)
  90. Fleishmann 1990, Appendix harvnb error: no target: CITEREFFleishmann1990 (help)
  91. Shkedi et al. 1995
  92. Jones et al. 1995, p. 1
  93. ^ Shanahan 2002
  94. Fleishmann 1990 harvnb error: no target: CITEREFFleishmann1990 (help),
  95. Biberian 2007 - ("Almost all the heat is dissipated by radiation and follows the temperature fourth power law. The cell is calibrated . . .")
  96. Browne 1989, para. 16
  97. Wilson 1992
  98. Shanahan 2005
  99. Shanahan 2006
  100. Schaffer 1999, p. 1, Scaramuzzi 2000, p. 4 ("It has been said . . . three 'miracles' are necessary")
  101. Schaffer 1999, p. 1
  102. Schaffer and Morrison 1999, p. 1,3
  103. Scaramuzzi 2000, p. 4, Goodstein 1994, Huizenga 1993 page viii "Enhancing the probability of a nuclear reaction by 50 orders of magnitude (...) via the chemical environment of a metallic lattice, contradicted the very foundation of nuclear science"
  104. Schaffer 1999, p. 1, Scaramuzzi 2000, p. 4, Goodstein 1994
  105. Schaffer 1999, p. 2, Scaramuzzi 2000, p. 4
  106. Schaffer 1999, p. 2, Scaramuzzi 2000, p. 4 , Goodstein 1994 (explaining Pons and Fleischmann would both be dead if they had produced neutrons in proportion to their measurements of excess heat)
  107. Schaffer 1999, p. 2, Scaramuzzi 2000, p. 4
  108. Goodstein 1994, Scaramuzzi 2000, p. 4
  109. Storms 2007, p. 173
  110. ^ Gregory Neil Derry (2002). Princeton University Press (ed.). What Science Is and How It Works (reprint, illustrated ed.). pp. 179, 180. ISBN 0691095507.
  111. Lewis, N., et al, Searches for low-temperature nuclear fusion of deuterium in palladium, Nature, 340:525-528, cited in Simon (2002)
  112. Lindley, D., 1989, Cold fusion: still no certainty, Nature 339:84, cited in Simon (2002)
  113. Alexander Bird (1998). Routledge (ed.). Philosophy of Science: Alexander Bird (illustrated, reprint ed.). pp. 261–262. ISBN 1857285042.
  114. Heeter 1999, p. 5
  115. Storms 2007, p. 180
  116. Takahashi, A., Deuteron cluster fusion and ash, in ASTI-5, Asti, Italy, 2004, cited in Storms 2007, p. 180
  117. He Jing-tang, Nuclear fusion inside condense matters, Front. Phys. China (2007) 1: 96―102
  118. Marwan, 2008 & pp. 57-83 harvnb error: no target: CITEREFMarwan2008pp._57-83 (help) Akito Takahashi and Norio Yabuuchi, Study on 4D/Tetrahedral Symmetric Condensate condensation motion by non-linear laangevin equation
  119. Alok Jha, Fuel's paradise? Power source that turns physics on its head, Guardian, Nov. 4, 2005, for background
  120. William J. Broad, 2 Teams Put New Life in 'Cold' Fusion Theory, New York Times, April 26, 1991, claims "ultradense hydrogen"
  121. R.L. Mills and S.P. Kneizys, Excess heat production by the electrolysis of an aqueous potassium carbonate electrolyte and the implications for cold fusion, Fusion Technology, 20, pp. 65-81 (1991).
  122. Rathke (2005). "A critical analysis of the hydrino model". New Journal of Physics. 2005 (7): 127. doi:10.1088/1367-2630/7/1/127. {{cite journal}}: Unknown parameter |month= ignored (help)
  123. ^ Erico Guizzo (January 2009). "Loser: Hot or Not?". IEEE Spectrum. (part of Winners & Losers VI, by Philip E. Ross in the same publication)
  124. Morrison, Chris (2008-10-21). "Blacklight Power bolsters its impossible claims of a new renewable energy source". New York Times.
  125. Jacqueline A. Newmyer (May 17, 2000). "Academics Question The Science Behind BlackLight Power, Inc". Harvard Crimson. Retrieved February 10, 2009.

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