ADOPTED LEVELS for 250Cm

Author: Y. Akovali |  Citation: Nucl. Data Sheets 94,131 (2001) |  Cutoff date: 1-Aug-2001 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=39 keV 12S(n)= 5832 keV 10S(p)= 7.4×103 keV SYQ(α)= 5169 keV 18
Reference: 2012WA38

References:
  A  254Cf α decay 

General Comments:

Theoretical studies:

For theoretical calculations of spontaneous fission half-life of 250Cm, see, for example, 1974Ho05, 1976Ra02, 1978Po09, 1983Bo15, 1987Mo16, 1989St20 (included pairing vibrations).

Decay by pion emission probability relative to SF decay was calculated by 1988Io04.

For fission barrier calculations, see 1972Ma11, 1973Ba19, 1976Iw02, 1977Pr10, 1980Ku14, 1984Ku05, 1991Pe03

For equilibrium deformations calculations, see 1982Du16, 1983Bo15.

Spontaneously fissioning isomeric state was predicted, and its properties were calculated by 1978Po01, 1992Bh03.

For the calculated B(E2; 0+ to 2+) value for the excitation of the first excited state by using the n(p)n(n) scheme, see 1993Sa05.

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






E(level)
(keV)
XREFJπ(level) T1/2(level)
   0.0A 0+ ≈ 8.3×10+3 y
% β- ≈ 8
% α ≈ 18
% SF ≈ 74
  43 5 A 2+  

E(level): Levels were populated in 254Cf α decay.

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
   0.00+ ≈ 8.3×10+3 y
% β- ≈ 8
% α ≈ 18
% SF ≈ 74
Only SF decay has been observed. Spontaneous fission half-life was measured: T1/2(SF)=17.4×103 y 24 (1966Rg01); 11.3×103 y 5 (1967Me16). Other measurement: 20×103 y (1957Hu76). T1/2(SF)=11.3×103 y 5 is recommended by 1989Ho24 and 2000Ho27.
E(level): Only SF decay has been observed. Spontaneous fission half-life was measured: T1/2(SF)=17.4×103 y 24 (1966Rg01); 11.3×103 y 5 (1967Me16). Other measurement: 20×103 y (1957Hu76). T1/2(SF)=11.3×103 y 5 is recommended by 1989Ho24 and 2000Ho27.
Jπ(level): K=0 g.s. rotational band.
  432+   Jπ(level): K=0 g.s. rotational band.

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