Talk:Isotopes of astatine
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EC decay properties of 213At somehow resemble 157Tb[edit]
| Decay process | QEC (keV) | Spin change |
|---|---|---|
| 157Tb → 157Gd | 60.052 | 3/2+ → 3/2− (ΔJΔπ = 0−) |
| 213At → 213Po | 73.93 | 9/2− → 9/2+ (ΔJΔπ = 0−) |
Of course, considering its 125 ns half-life, observation of electron capture of 213At is infeasible (perhaps with a probability at the order of 10-15%). An upper limit of the branching ratio has not been determined, but the value is expected here to be < 2.5×10-12% (half-life > 57.87 d). 129.104.241.214 (talk) 22:24, 20 December 2023 (UTC)
NUBASE lists 216mAt as 161(11) keV[edit]
The has huge difference with the former value 413(5) keV, so I kept it unchanged.
By the way, its β− decay to 216Rn has a high Q value of 2162.781 keV, so I wouldn't expect it to be very stable with respect to that decay mode. In particular, it can decay to the 8+ state of 216Rn (if the link does not work, try [1]) with Q value 517.8 keV. On the other hand, the EC process can only lead to the 2+ state of 216Po with Q value 84.44 keV, so this decay process would be nearly impossible. 2A04:CEC0:108C:3F69:64A1:FC7A:2455:1D58 (talk) 06:32, 12 April 2024 (UTC)
Beta-decay branching ratio upper limits of 212At and 216At[edit]
See https://www.nndc.bnl.gov/ensnds/212/At/adopted.pdf and https://www.nndc.bnl.gov/ensnds/216/At/adopted.pdf. Neither beta mode for neither nuclide has been observed. 103.166.228.86 (talk) 05:28, 19 April 2024 (UTC)