ADOPTED LEVELS for 237Cm

Author: M. S. Basunia |  Citation: Nucl. Data Sheets 107, 3323 (2006) |  Cutoff date: 15-Mar-2006 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-3.94×103 keV SYS(n)= 6.68×103 keV 8S(p)= 4.08×103 keV SYQ(α)= 6.77×103 keV 5
Reference: 2012WA38

References:
  A  241Cf α decay 

General Comments:

Mass excess for 237Cm was interpolated in 1988Ha24 as 49.35 MeV from plots of "semiempirical-microscopic mass " systematics verses Np{INn/(Np+{INn). The "semiempirical- microscopic mass " terms, giving the structure-dependent component of the atomic masses, were taken as the differences between the empirical masses of 1985Wa02 and the calculated masses of 1981Mo24 for spherical nuclei. From 2003Au03, mass excess for 237Cm is 49.28 21(syst) MeV.

The nucleus and its decay have not been experimentally studied. Existence of a level at ≈190 keV is deduced from the 7342-keV α observed in 241Cf decay.

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

Q-value: ΔQ(β-)=300(syst), ΔS(n)=300(syst), ΔS(p)=230(syst), ΔQ(α)=200(syst) 2003Au03




E(level)
(keV)
XREF
     0.0SA
  ≈194A

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.0   α branching of 241Cf to 237Cm has not been experimentally determined, but estimated by the evaluator as 14% 7. The assumption that the observed 7342-keV α of 241Cf is a favored transition (therefore HF|<4.0) and its intensity is about 76% of α decay yield %α|>12.5. See 241Cf α decay.
E(level): α branching of 241Cf to 237Cm has not been experimentally determined, but estimated by the evaluator as 14% 7. The assumption that the observed 7342-keV α of 241Cf is a favored transition (therefore HF|<4.0) and its intensity is about 76% of α decay yield %α|>12.5. See 241Cf α decay.

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