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Revision as of 12:00, 14 August 2019 editDYKUpdateBot (talk | contribs)Bots, Administrators249,811 edits Article appeared on DYK on 14 August 2019, adding {{DYK talk}}← Previous edit Revision as of 17:17, 14 August 2019 edit undoIncnis Mrsi (talk | contribs)Extended confirmed users, Pending changes reviewers, Rollbackers11,646 edits →8Be nucleus is only held together by a low Coulomb barrier: new sectionNext edit →
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Surely is it 6.8 eV not 92 keV? {{serif|I}} suppose that 6 eV is indeed the ], another quantity characterizing decay. By the way, what exactly is “92 keV”: the total kinetic energy (]) or the energy of ''one'' α-particle? For <sup>8</sup>Be we have the former equal 2× the latter. ] (]) 10:47, 30 July 2019 (UTC) Surely is it 6.8 eV not 92 keV? {{serif|I}} suppose that 6 eV is indeed the ], another quantity characterizing decay. By the way, what exactly is “92 keV”: the total kinetic energy (]) or the energy of ''one'' α-particle? For <sup>8</sup>Be we have the former equal 2× the latter. ] (]) 10:47, 30 July 2019 (UTC)
:{{ping|Incnis Mrsi}} Every source I found gives 92 keV or something close to that (e.g. 91.84 keV in NUBASE and ). As is explained in several of the references, 92 keV is the difference in energy between the <sup>8</sup>Be ground state and two <sup>4</sup>He nuclei; thus, 92 keV is the total amount of energy released during decay (or consumed in production) of <sup>8</sup>Be. 6 eV, meanwhile, is given as the resonance width in the same sources, and is said to directly correlate with the half-life. I'm leaving 91.84 keV in the infobox until/unless a better source is found. ] (]) 15:06, 30 July 2019 (UTC) :{{ping|Incnis Mrsi}} Every source I found gives 92 keV or something close to that (e.g. 91.84 keV in NUBASE and ). As is explained in several of the references, 92 keV is the difference in energy between the <sup>8</sup>Be ground state and two <sup>4</sup>He nuclei; thus, 92 keV is the total amount of energy released during decay (or consumed in production) of <sup>8</sup>Be. 6 eV, meanwhile, is given as the resonance width in the same sources, and is said to directly correlate with the half-life. I'm leaving 91.84 keV in the infobox until/unless a better source is found. ] (]) 15:06, 30 July 2019 (UTC)

== <sup>8</sup>Be nucleus is only held together by a low Coulomb barrier ==

Unfortunately {{serif|I}} missed the moment when the rubbish found its way to the article. ''Both'' α-particles have positive charge. Guys, you certainly know electrostatics enough to realize implications about the “barrier” when to look from inside. ] (]) 17:17, 14 August 2019 (UTC)

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A fact from Beryllium-8 appeared on Misplaced Pages's Main Page in the Did you know column on 14 August 2019 (check views). The text of the entry was as follows: A record of the entry may be seen at Misplaced Pages:Recent additions/2019/August. The nomination discussion and review may be seen at Template:Did you know nominations/Beryllium-8.
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Natural abundance

“Trace” where? Should the reader expect the infobox to tell about abundance in stars? And not photosphere but in the core, and even not of our Sun but in some red giants, massive stars, or alike. Incnis Mrsi (talk) 08:35, 12 July 2019 (UTC)

@Incnis Mrsi: I changed the abundance to zero in the infobox as there indeed is no source of Be on Earth, and added a note on its transient existence in the cores of helium-burning stars. ComplexRational (talk) 10:49, 12 July 2019 (UTC)

decay_energy1

Surely is it 6.8 eV not 92 keV? I suppose that 6 eV is indeed the resonance width, another quantity characterizing decay. By the way, what exactly is “92 keV”: the total kinetic energy (CoM) or the energy of one α-particle? For Be we have the former equal 2× the latter. Incnis Mrsi (talk) 10:47, 30 July 2019 (UTC)

@Incnis Mrsi: Every source I found gives 92 keV or something close to that (e.g. 91.84 keV in NUBASE and ). As is explained in several of the references, 92 keV is the difference in energy between the Be ground state and two He nuclei; thus, 92 keV is the total amount of energy released during decay (or consumed in production) of Be. 6 eV, meanwhile, is given as the resonance width in the same sources, and is said to directly correlate with the half-life. I'm leaving 91.84 keV in the infobox until/unless a better source is found. ComplexRational (talk) 15:06, 30 July 2019 (UTC)

Be nucleus is only held together by a low Coulomb barrier

Unfortunately I missed the moment when the rubbish found its way to the article. Both α-particles have positive charge. Guys, you certainly know electrostatics enough to realize implications about the “barrier” when to look from inside. Incnis Mrsi (talk) 17:17, 14 August 2019 (UTC)

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