ADOPTED LEVELS for 256Md
Author: Balraj Singh | Citation: Nucl. Data Sheets 141, 327 (2017) | Cutoff date: 22-Mar-2017
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=-370 keV SY | S(n)= 5460 keV SY | S(p)= 3630 keV SY | Q(α)= 7740 keV SY | ||
Reference: 2017WA10 |
References: | |||
A | 260Lr α decay (180 S) |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) |
0.0 | A | (1-) | 77.7 m 18 % ε = 90.8 7 % α = 9.2 7 % SF < 3 |
≈240 | A |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0.0 | (1-) | 77.7 m 18 % ε = 90.8 7 % α = 9.2 7 % SF < 3 | (α)/(α+ε)=9.2% 7 is adopted from 8.5% 8, determined by 1970Fi12 from K| x ray/α intensities, and 9.9% 5, determined by 1971Ho16 from 256Fm growth. The latest value of 11% 3, obtained by 1993Mo18, is in agreement with the earlier values. %α=9.2 7 is an unweighted average of earlier measurements. 2000Ah02 quote %ε=92, but the source reference is not given. E(level): (α)/(α+ε)=9.2% 7 is adopted from 8.5% 8, determined by 1970Fi12 from K| x ray/α intensities, and 9.9% 5, determined by 1971Ho16 from 256Fm growth. The latest value of 11% 3, obtained by 1993Mo18, is in agreement with the earlier values. %α=9.2 7 is an unweighted average of earlier measurements. 2000Ah02 quote %ε=92, but the source reference is not given. |
256Md produced and identified by Ghiorso et al., Phys. Rev. 98, 1518 (1955) in 253Es(α,n),E=48 MeV reaction, followed by chemical separation. The half-life was reported to be about 0.5 hour. Later studies: 1958Ph40, 1965Si14, 1970Fi12, 1971Ho16, 1993Mo18
Theoretical calculations: consult the Nuclear Science References (NSR) database for about 27 theory references.
1986So12: nuclear structure theory reference
Q-value: Estimated uncertainties (2017Wa10): 120 for Q(β-), S(n) and S(p); 110 for Q(α)
Q-value: S(2n)=12140 160, S(2p)=9110 120 (syst,2017Wa10)