Talk:Nuclear isomer

According to the section Nucleus, {{Nuclide2|Ta|180|m}} and {{Nuclide2|Ta|180}} have spin of -9 and +1 respectively. According to the section High spin suppression of decay, the spin changes 8 units when one decays to the others. Can both be correct?

Klausok (talk) 10:32, 27 June 2016 (UTC)

:{{ping|Klausok}}

:A good question which no one has answered after almost 2 years. Yes, there is an error here. Actually, the magnitudes of all nuclear spins without exception are nonnegative (positive or zero). The spin of {{Nuclide2|Ta|180|m}} is sometimes written as 9– (rather than –9) as in the table in the article on isotopes of tantalum, but the minus sign following the 9 refers to the parity of the quantum wave function; it does not imply that the spin is negative. I have not yet found this spin and parity notation properly described anywhere in Wikipedia. For now I will just remove the minus sign in this article for {{Nuclide2|Ta|180|m}}, and also for {{Nuclide2|Tc|99|m}}. Dirac66 (talk) 15:24, 18 April 2018 (UTC)

Could someone add Excitation energy? Looking for a definition. -DePiep (talk) 11:06, 13 June 2019 (UTC)

: Could become #REDIRECT Excited state just this minute if {{serif|I}} noticed at least one main-space inbound link. Incnis Mrsi (talk) 16:14, 13 June 2019 (UTC)

class="wikitable"
	N = 127	N = 129	N = 131
Z = 83 | g.s.: spin 1−, half-life 5.012 d (β−, α) 271.31 keV: spin 9−, half-life 3.04×106 y (α) | g.s.: spin 1−, half-life 60.55 min (β−, α, β−α) 250 keV: spin 9−, half-life 25 min (α, β−α, β−) | g.s.: spin 1−, half-life 19.9 min (β−, α, β−α) 539 keV: spin 8−, half-life >93 s (?)
Z = 85 | g.s.: spin 1−, half-life 314 ms (α) 223 keV: spin 9−, half-life 119 ms (α) | g.s.: spin 1−, half-life 558 ns (α) 232 keV: spin 9−, half-life 760 ns (α) | g.s.: spin 1−, half-life 0.30 ms (α) 161 keV: spin 9−, half-life 0.10 ms (α)
Z = 87 | g.s.: spin 1−, half-life 5.0 ms (α) 123 keV: spin 8−, half-life 3.35 ms (α) | g.s.: spin 1−, half-life 700 ns (α) 219 keV: spin 9−, half-life 850 ns (α) | g.s.: spin 1−, half-life 1.0 ms (α) 86 keV: spin 8−, half-life 22.0 ms (α)
Z = 89 | g.s.: spin 1−, half-life 440 μs (α) 38 keV: spin 9−, half-life 441 μs (α) | g.s.: spin 1−, half-life 1.08 μs (α) (50±70) keV (predicted by NUBASE2020): spin 8−, half-life >100 ns (α?) |

129.104.241.69 (talk) 02:07, 20 December 2024 (UTC)

:By the way, I think that for these nuclides the high-spin states (8⁻ or 9⁻) has always higher energy than the lower-spin states (1⁻) because the levels of the nucleons are clear as these nuclides are closed to being spherical. Things are less well-defined for nuclides far from closed shell. (For ¹⁷⁶Lu the 1⁻ state has higher energy than the 7⁻ state; for ¹⁸⁰Ta it is the other way round, the 9⁻ state has higher energy than the 1⁺ state; and we still don't know which state between 1⁻ and 6⁺ of ²⁴⁸Bk has lower energy). 129.104.241.69 (talk) 08:16, 20 December 2024 (UTC)