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 12 | S(n)= 5832 keV 10 | S(p)= 7.4×103 keV SY | Q(α)= 5169 keV 18 | ||
| Reference: 2012WA38 |
| References: | |||
| A | 254Cf α decay | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) |
| 0.0 | A | 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.
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 0+ | ≈ 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. |
| 43 | 2+ | Jπ(level): K=0 g.s. rotational band. |
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 37 11 5832 10 7409 syst 5169 19 1995Au04