Talk:Isotopes of potassium
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31K
[edit]31K gets one mention and some links, but is otherwise ignored in the article. Do we fully include or fully exclude it? Hcobb (talk) 15:47, 11 October 2020 (UTC)
- @Hcobb: In the articles Potassium and Isotopes of potassium I did not find any mentioning of 31K (potassium-31). Could you point out where you see those mentionings? -DePiep (talk) 19:09, 11 October 2020 (UTC)
From this article:
"All other potassium isotopes have half-lives under a day, most under a minute. The least stable is 31K, a three-proton emitter discovered in 2019; its half-life was measured to be shorter than 10 picoseconds.[4][5]"
Hcobb (talk) 18:10, 12 October 2020 (UTC)
- Oops, it's in there.
- Now could it be the 10 picoseconds (very short HL) that makes this one 'not recognised as an isotope'? (I could not find such a treshold though). -DePiep (talk) 18:20, 12 October 2020 (UTC)
- I added it to the table and lead section; its observation and very short half-life are clearly described in the sources. I believe it is still recognized as an isotope (one threshold I found is ~10−12 s, but we include unbound states on the order of 10−22 s, so that doesn't matter). However, as far as I can tell, the intermediate isotope 32K is still unobserved, though it is most likely unbound as well. ComplexRational (talk) 20:46, 12 October 2020 (UTC)
42K
[edit]Shouldn't 42K be a trace radionuclide because on the Isotopes of argon page, it says 42Ar is a trace radionuclide. 42Ar β− decays into 42K so shouldn't 42K be a trace radionuclide? -322UbnBr2 (Talk | Contributions | Actions) 03:40, 14 November 2020 (UTC)
Contribution of 40K to the geothermal gradient?
[edit]Should some mention be made of the contribution of 40K to the geothermal gradient, assuming it is still accepted as such? Vaughan Pratt (talk) 06:20, 21 July 2021 (UTC)
Half-life of beta plus decay
[edit]"40K has the longest known half-life for any positron-emitter nuclide." I suppose that this refers to the partial half-life of beta plus decay. When just talking about the half-life, 138La has a longer one. 2A04:CEC0:1011:B1F1:C5E3:F416:5CD7:1B03 (talk) 23:20, 13 November 2023 (UTC)
Potassium-34 decay width
[edit]Can someone access the discovery paper for this isotope and check for a decay width? This information is sufficient to calculate a half-life. This paper also discovered 37Sc and 38Sc, and there should also be decay widths if 34K has one.
- Dronchi, N.; Charity, R. J.; Sobotka, L. G.; Brown, B. A.; Weisshaar, D.; Gade, A.; Brown, K. W.; Reviol, W.; Bazin, D.; Farris, P. J.; Hill, A. M.; Li, J.; Longfellow, B.; Rhodes, D.; Paneru, S. N.; Gillespie, S. A.; Anthony, A. K.; Rubino, E.; Biswas, S. (2024-09-12). "Evolution of shell gaps in the neutron-poor calcium region from invariant-mass spectroscopy of 37,38Sc, 35Ca, and 34K". Physical Review C. 110 (3). doi:10.1103/PhysRevC.110.L031302. ISSN 2469-9985.