Talk:Isotopes of neptunium

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Neptunium 219

http://www.sciencedirect.com/science/article/pii/S0370269317309942 half-life of 0.15ms (= -0.07 +0.72) This needs adding to the table. — Preceding unsigned comment added by 92.11.246.147 (talk) 16:11, 23 December 2017 (UTC)

Will take a look (and has the gap from 220 to 224 inclusive been filled yet?). Double sharp (talk) 10:51, 12 February 2018 (UTC)

Well, now it has, save 221 only. :) Double sharp (talk) 09:09, 26 July 2024 (UTC)

²³⁴Np: Spin 0+?

That looks impossible as ²³⁴Np is an odd-odd nuclide. 129.104.241.214 (talk) 17:01, 6 March 2024 (UTC)

³⁴Cl also has 0+ spin. How is it impossible? Nucleus hydro elemon (talk) 15:34, 7 March 2024 (UTC)

Thanks for the reminder. I had always thought that the spin of an odd-odd nuclide can't be zero, as it is stated here: "If the numbers of protons and neutrons are both odd, the ground state nuclear spin is an integer larger than zero" ... 129.104.241.214 (talk) 03:43, 10 March 2024 (UTC)

Ah, I found that ⁵⁰Mn, ⁶⁰Mn, ⁵⁴Co, ⁷⁴Co, ⁶²Ga, ⁶⁴Ga, ⁶⁶Ga, ⁶⁴As, ⁶⁶As, ⁷⁰Br, ⁷⁴Rb, ⁷⁴Rb, ⁷⁸Y, ⁸²Nb, ⁸⁶Tc, ⁹⁰Rh, ⁹⁴Ag, ⁹⁸In, ... also have spin 0+. This includes N = Z nuclides for odd Z = 17 and 25 through 49 (except 29). 129.104.241.214 (talk) 03:55, 10 March 2024 (UTC)

Contradictions regarding Np-237

The section Isotopes_of_neptunium#Shortage_of_237Np_stockpiles implies Np-237 decay doesn't involve gamma ray emission, but the section Isotopes_of_neptunium#Neptunium-237 includes a decay scheme showing gamma emissions at 29 KeV and 86 KeV. 2603:8080:E500:161F:24AA:52BD:4E5C:B896 (talk) 18:59, 28 June 2024 (UTC)

The first link you mention is talking about Pu-238 decay, not Np-237 decay. Double sharp (talk) 07:27, 26 July 2024 (UTC)

²³⁷Np is an interesting nuclide

There are 8 alpha emitters having a short half-life between 10⁶ to 10⁸ years: ¹⁴⁶Sm (92.0 My), ¹⁵⁰Gd (1.79 My), ¹⁵⁴Dy (1.40 My), ^210mBi (3.04 My), ²³⁶U (23.42 My), ²³⁷Np (2.144 My), ²⁴⁴Pu (80 My), and ²⁴⁷Cm (15.7 My). I believe that among these nuclides only ²³⁶U and ²³⁷Np can be produced in large amounts :) 129.104.241.181 (talk) 05:26, 25 November 2024 (UTC)

¹⁵⁰Gd and ¹⁵⁴Dy are p-nuclei that can't be produced from neutron capture. ¹⁴⁴Sm might capture 2 neutrons to form ¹⁴⁶Sm, but I'm not sure do anyone did this before. ²⁴⁴Pu is hard to produce by slow neutron capture due to ²⁴³Pu bottleneck. ²⁴⁷Cm is also hard to produce because most atoms die from (n,SF) during its production, and there is no reason to prepare ²⁴⁷Cm (Pure sample of ^244,245,248Cm can be obtained easier).

Only ^210mBi, ²³⁶U, and ²³⁷Np remain. ²³⁶U is a nuisance from failed ²³⁵U fission, while ²³⁷Np is the only reasonable isotope of neptunium that can be produced, so both of them are produced in large amounts. ^210mBi however, doesn't have applications and is ignored despite can be easily made from bombarding thermal neutrons to ²⁰⁹Bi. (doi:10.1103/PhysRevC.105.025802) Nucleus hydro elemon (talk) 14:47, 25 November 2024 (UTC)

Very nice summary, thanks! :) 129.104.241.181 (talk) 02:02, 27 November 2024 (UTC)