ADOPTED LEVELS for 256Cf
Author: Balraj Singh | Citation: Nucl. Data Sheets 141, 327 (2017) | Cutoff date: 22-Mar-2017
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-150 keV SY | S(n)= 5840 keV SY | S(p)= 7340 keV CA | Q(α)= 5560 keV SY | ||
| Reference: 2017WA10,1997MO25 |
| E(level) (keV) | Jπ(level) | T1/2(level) |
| 0.0 | 0+ | 12.3 m 12 % SF = 100 % α < 1×10-6 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 0+ | 12.3 m 12 % SF = 100 % α < 1×10-6 | Only SF-decay mode has been observed. Possible α decay branch can be estimated by various methods: 1. by requiring HF(α to g.s. of 252Cm)=1.0, Iα=5.0×10-7% 20 is deduced using r0(252Cm)=1.533 fm 20 from local r0 trend given in 1998Ak04, and Q(α)(256Cf)=5560 100 (2017Wa10). The estimated intensity of 0.80 20 per α decay for the α to g.s. gives %α=6.2×10-7 30. 2. from semiempirical Geiger-Nuttal formula, 1997Po18 calculated T1/2(α)=9×103 y, from which %α=2.6×10-7 is obtained. 3. theoretical calculations of 1997Mo25 yield T1/2(α)=1×1012 s which corresponds to %α=7.8×10-8. E(level): Only SF-decay mode has been observed. Possible α decay branch can be estimated by various methods: 1. by requiring HF(α to g.s. of 252Cm)=1.0, Iα=5.0×10-7% 20 is deduced using r0(252Cm)=1.533 fm 20 from local r0 trend given in 1998Ak04, and Q(α)(256Cf)=5560 100 (2017Wa10). The estimated intensity of 0.80 20 per α decay for the α to g.s. gives %α=6.2×10-7 30. 2. from semiempirical Geiger-Nuttal formula, 1997Po18 calculated T1/2(α)=9×103 y, from which %α=2.6×10-7 is obtained. 3. theoretical calculations of 1997Mo25 yield T1/2(α)=1×1012 s which corresponds to %α=7.8×10-8. |
1980Ho04 (also 1978Wi12): 256Cf identified in 254Cf(t,p),E=16 MeV reaction, followed by the observation of SF activity, whereas assignment was based on the production cross section and the known SF properties of other nuclei that could be produced in this reaction.
Theoretical calculations: consult the Nuclear Science References (NSR) database for about 40 theory references.
2012Jo05: level energies and configurations of 2+ γ-vibrational states using quasiparticle-phonon model.
Q-value: S(p) from theory (1997Mo25), other values from 2017Wa10
Q-value: Estimated uncertainties (2017Wa10): 330 for Q(β-), 370 for S(n), 100 for Q(α)
Q-value: S(2n)=10440 320 (syst,2017Wa10). S(2p)=13240 (theory,1997Mo25)