ADOPTED LEVELS for 256Es
Author: Balraj Singh | Citation: Nucl. Data Sheets 141, 327 (2017) | Cutoff date: 22-Mar-2017
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=1700 keV SY | S(n)= 4970 keV SY | S(p)= 4910 keV SY | Q(α)= 6230 keV SY | ||
| Reference: 2017WA10 |
| E(level) (keV) | Jπ(level) | T1/2(level) |
| 0.0 | (1+,0-) | 25.4 m 24 % β- = 100 |
| 0.0+X | (8+) | 7.6 h % β- = 100 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (1+,0-) | 25.4 m 24 % β- = 100 | Only the β- decay mode is observed. The theoretical calculations by 1997Mo25 give T1/2(α)=1×1010 s for α partial half-life. E(level): Only the β- decay mode is observed. The theoretical calculations by 1997Mo25 give T1/2(α)=1×1010 s for α partial half-life. |
| 0.0+X | (8+) | 7.6 h % β- = 100 | Assignment: 254Es(t,p), chem, parent of 256Fm (1976HoZB, 1976HuZU, 1976HoZF). Production σ of the isomer also measured by 2013Kr14 in 238U+238U reaction at GSI. E(level): Assignment: 254Es(t,p), chem, parent of 256Fm (1976HoZB, 1976HuZU, 1976HoZF). Production σ of the isomer also measured by 2013Kr14 in 238U+238U reaction at GSI. |
1955Ch30, 1981Lo15: assignment in 255Es(n,γ),E=thermal followed by chemical separation, parent of 256Fm (the growth and decay of SF activity from 256Fm were observed).
1984Br14, 1980Br02: 254Es(t,pF),E=11-17 MeV; measured (fragment)(fragment)-coin spectra, deduced fission yield, first barrier height
Theoretical calculations: consult the Nuclear Science References (NSR) database for about 15 theory references.
Q-value: Estimated uncertainties (2017Wa10): 100 for Q(β-) and S(n), 220 for S(p) and Q(α)
Q-value: S(2n)=10950 100, S(2p)=11780 310 (syst,2017Wa10)