ADOPTED LEVELS for 258Fm
Author: Balraj Singh | Citation: Nucl. Data Sheets 144, 297 (2017) | Cutoff date: 25-Aug-2017
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=-1260 keV SY | S(n)= 6240 keV SY | S(p)= 6270 keV SY | Q(α)= 6660 keV SY | ||
Reference: 2017WA10 |
References: | |||
A | 258Md ε decay (57.0 M) |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) |
0 | A | 0+ | 370 µs 14 % SF ≈ 100 |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0 | 0+ | 370 µs 14 % SF ≈ 100 | Theoretical partial half-lives for α decay predict very small α branch: T1/2(α)=12.9 y (1997Mo25), 86 d (1997Po18). |
1971Hu03: 258Fm produced in 257Fm(d,p), measured T1/2(SF)
1971Jo13: 258Fm from thermal neutron capture in 257Fm, studied SF distribution
1986Hu05: 258Fm from ε-decay daughter of 57-min 258Md; measured time correlation of fermium K-x rays with SF fragments
1989Hu09, 1986Hu01, 1980Ho04: measured fission-fragment mass and total kinetic energy distributions
Theoretical studies: consult the NSR database at www.nndc.bnl.gov for about 120 references dealing with theoretical calculations of half-lives for different decay modes, binding energies, fission characteristics, and other nuclear structure aspects.
Q-value: Estimated uncertainties (2017Wa10): 200 for Q(β-), S(n) and Q(α), 460 for S(p)
Q-value: S(2n)=11200 200, S(2p)=11190 370 (syst,2017Wa10)