element
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Information about Fermium-257:
 |  |  | | | Wikipedia | Neutron Cross Sections | X-Ray Transitions | X-Ray Attenuation |
Mass-Energy Data:
| Atomic Mass: | 257.095099 | ± | 0.000007 | amu |
| Excess Mass (Δ): | 88.583794 | ± | 0.006368 | MeV |
| Binding Energy: | 1907.510827 | ± | 0.006377 | MeV |
| β- Decay Energy: | -0.406139 | ± | 0.006642 | MeV |
"The 1995 update to the atomic mass evaluation" by G.Audi and A.H.Wapstra,
Nuclear Physics A595 vol. 4 p.409-480, December 25, 1995.
Radioactive Decay Data:
- Spin: (9/2+)
- Half life: 100.5 days ( 8.6832×10+06 sec., λ = 7.98262×10-08 s-1)
- Mode of decay:
α to
(Q = 6.864 MeV)
Branch ratio: 99.79 %
- Mode of decay: SF
Branch ratio: 0.21 %
- Possible parent nuclides:
- E.C. from
R.R.Kinsey, et al.,The NUDAT/PCNUDAT Program for Nuclear Data,paper submitted to the 9 th International Symposium of Capture-Gamma_raySpectroscopy and Related Topics, Budapest, Hungary, Octover 1996.Data extracted from NUDAT database (Jan. 14/1999)
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