ADOPTED LEVELS for 121Pr

Author: S. Ohya |  Citation: Nucl. Data Sheets 111, 1619 (2010) |  Cutoff date: 20-Jan-2009 

 Full ENSDF file | Adopted Levels (PDF version) 


S(p)= -890 keV 10Q(α)= 2.5×103 keV SY
Reference: 2012WA38

General Comments:

Identification: 2005Ro19; 92Mo(36Ar,p6n) reaction at E=240 MeV. fragment mass analyzer, measured E(p), I(p), lifetime, identified by α/q, time of arrival and energy-loss signal. α transition with E(p)=882 keV 10 and T1/2=10 ms +6-3 has been assigned the decay of 121Pr g.s.

1972Bo28,1990Bo39; 96Ru(32S,p6n) E=275 MeV, on-line ms, helium jet, proportional counter, E(p)=0.83 MeV 5 proton emitter with T1/2=1.4 s 8 has been postulated as 121Pr g.s. or a lighter isotope of Lanthanum (1972Bo28), confirmed 121Pr g.s.(1990Bo39). However, the T1/2 value is disagreement with 10 ms +6-3 (2005Ro19)

Tentative evidence of a second, weaker proton peak at ≈930 keV could be due to proton decay of an isomeric state in 121Pr (2005Ro19)

Q-value: Note: Current evaluation has used the following Q record

Q-value: S(p) from 2005Ro19, 2009AuZZ give -840 50, Q(α) from 2009AuZZ, ΔQ(α)=807 (syst,2009AuZZ), Q(εp)=8820 862 (sys,2009AuZZ)





E(level)
(keV)
Jπ(level) T1/2(level)
  0.0 (3/2) 10 ms +6-3 
% p ≈ 100

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
  0.0(3/2) 10 ms +6-3 
% p ≈ 100
%p assumed by 2005Ro19 since the measured half-life is much shorter than the calculated β+ decay half-life of ≈300 ms (1997Mo25).

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