102-No-257  basic  element

102-nobelium-257 Atomic Mass: 257.0968528 +- 0.0000331 amu Excess Mass: 90217.768 +- 30.873 keV Binding Energy: 1904312.147 +- 30.874 keV Beta Decay Energy: B- -2564.000 +- 210.000 keV # "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. Spin: (7/2+) Half life: 25 s Mode of decay: Alpha to Fm-253 Branch ratio: ~100.00 % Decay energy: 8.450 MeV 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)