User talk:Double sharp: Difference between revisions
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== Do we have a table of nuclear masses? == |
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I mean a table of masses of bare nuclei, not of atoms. |
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By energy conservation we have nuclear mass + Z*electron mass - atomic mass = sum of ionization energies. For <sup>4</sup>He, the left side is |
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<math>(4.001506179129 + 2\times 0.0005485799090441 - 4.002603254130)\times 931494103.72=79.00662\,\mathrm{eV}</math>, |
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which is consistent with the sum 79.00514 eV of data given [[Ionization energies of the elements (data page)|here]]. |
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In general, if we need to find nuclear mass, we must also know the data of ionization energies, which are in general incomplete and (more seriously) are suspected to vary for different isotopes of an element. (The calculation above works because the proportion of <sup>3</sup>He in natural helium is much, much too tiny). Any idea? [[Special:Contributions/169.155.234.214|169.155.234.214]] ([[User talk:169.155.234.214|talk]]) 09:09, 26 December 2024 (UTC) |
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:Currently away on holiday, so a search will have to wait. But indeed no idea off the top of my head. [[User:Double sharp|Double sharp]] ([[User talk:Double sharp#top|talk]]) 05:51, 27 December 2024 (UTC) |
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::OK thanks :) [[Special:Contributions/169.155.234.55|169.155.234.55]] ([[User talk:169.155.234.55|talk]]) 11:18, 27 December 2024 (UTC) |
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Thank you! [[User:Szelma W|Szelma W]] ([[User talk:Szelma W|talk]]) 11:26, 3 January 2025 (UTC) |
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Revision as of 11:26, 3 January 2025
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Do we have a table of nuclear masses?
I mean a table of masses of bare nuclei, not of atoms.
By energy conservation we have nuclear mass + Z*electron mass - atomic mass = sum of ionization energies. For 4He, the left side is
,
which is consistent with the sum 79.00514 eV of data given here.
In general, if we need to find nuclear mass, we must also know the data of ionization energies, which are in general incomplete and (more seriously) are suspected to vary for different isotopes of an element. (The calculation above works because the proportion of 3He in natural helium is much, much too tiny). Any idea? 169.155.234.214 (talk) 09:09, 26 December 2024 (UTC)
- Currently away on holiday, so a search will have to wait. But indeed no idea off the top of my head. Double sharp (talk) 05:51, 27 December 2024 (UTC)
- OK thanks :) 169.155.234.55 (talk) 11:18, 27 December 2024 (UTC)
Ad: Barnstar
Thank you! Szelma W (talk) 11:26, 3 January 2025 (UTC)