Talk:Nuclear isomer

Physics High‑importance

	Physics portal This article is within the scope of WikiProject Physics, a collaborative effort to improve the coverage of Physics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.PhysicsWikipedia:WikiProject PhysicsTemplate:WikiProject Physicsphysics
High	This article has been rated as High-importance on the project's importance scale.

Chemistry Mid‑importance

	This article is within the scope of WikiProject Chemistry, a collaborative effort to improve the coverage of chemistry on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.ChemistryWikipedia:WikiProject ChemistryTemplate:WikiProject ChemistryChemistry
Mid	This article has been rated as Mid-importance on the project's importance scale.

Elements High‑importance

	Chemistry portal This article is supported by WikiProject Elements, which gives a central approach to the chemical elements and their isotopes on Wikipedia. Please participate by editing this article, or visit the project page for more details.ElementsWikipedia:WikiProject ElementsTemplate:WikiProject Elementschemical elements
High	This article has been rated as High-importance on the importance scale.

Military history: Technology / Weaponry Start‑class

This article is within the scope of the Military history WikiProject. If you would like to participate, please visit the project page, where you can join the project and see a list of open tasks. To use this banner, please see the full instructions.Military historyWikipedia:WikiProject Military historyTemplate:WikiProject Military historymilitary history

Start

This article has been rated as Start-class on the project's quality scale.

This article has been checked against the following criteria for B-class status:
Referencing and citation: criterion not met Coverage and accuracy: criterion not met Structure: criterion met Grammar and style: criterion met Supporting materials: criterion not met

Associated task forces:
/
	Military science, technology, and theory task force
	Weaponry task force

Explosives Low‑importance

	This article is within the scope of WikiProject Explosives, a collaborative effort to improve the coverage of Explosives on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.ExplosivesWikipedia:WikiProject ExplosivesTemplate:WikiProject ExplosivesExplosives
Low	This article has been rated as Low-importance on the importance scale.

Archives

Archive 1

This page has archives. Sections older than 730 days may be automatically archived by when more than 3 sections are present.

9 + 1 = 8

According to the section Nucleus, ^180m
₇₃Ta
and ¹⁸⁰
₇₃Ta
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)[reply]

@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 ^180m
₇₃Ta
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 ^180m
₇₃Ta
, and also for ^99m
₄₃Tc
. Dirac66 (talk) 15:24, 18 April 2018 (UTC)[reply]

Excitation energy

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

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

I just realized that some odd-odd nuclides above Z = 82, N = 126 must have very similar structures

	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)[reply]

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)[reply]