Authors: Balraj Singh and Jun Chen |  Citation: Nucl. Data Sheets 185, 2 (2022) |  Cutoff date: 23-Aug-2022 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=-10610 keV SYS(n)= 13250 keV SYS(p)= -250 keV SYQ(α)= 2760 keV SY
Reference: 2021WA16

General Comments:

149Tm isotope produced and identified by 1987To12.

153Lu isomers with h11/2 and s1/2 orbitals have been identified from 157Ta α decay (1997Ir01). It is possible that these isomers decay by α decay to 149Tm. Gross theory of β decay (1973Ta30) predicts %α≈70, but calculations of 2019Mo01 give T1/2(153Lu α decay)=10×1016.67 s, suggesting negligible %α decay

Theoretical studies: consult the NSR database at for three references for structure and two for radioactive decay listed under ’document records’ which can be accessed through web retrieval of the ENSDF database at

Q-value: ΔQ(β-)=360, ΔS(n)=ΔS(p)=ΔQ(α)=200 (syst,2021Wa16)

Q-value: Q(ε)=9800 200, Q(εp)=6760 220, S(2n)=24110 200, S(2p)=2760 200 (syst,2021Wa16)

Jπ(level) T1/2(level)
  0.0 (11/2-) 0.9 s 2 
% ε = 100
% εp = 0.2 +2-1

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Additional Level Data and Comments:


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