99-Es-251
 basic
 XS graphs

 element
99-einsteinium-251

  • Atomic Mass: 251.0799836 +- 0.0000065 amu
  • Excess Mass: 74504.225 +- 6.099 keV
  • Binding Energy: 1873944.813 +- 6.108 keV
  • Beta Decay Energy: B- -1474.438 +- 6.828 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: (3/2-)
  • Half life: 33 h
  • Mode of decay: Electron capture to Cf-251
    • Branch ratio: 99.51 %
    • Decay energy: 0.376 MeV
  • Mode of decay: Alpha to Bk-247
    • Branch ratio: 0.49 %
    • Decay energy: 6.597 MeV

  • Possible parent nuclides:
    Electron capture from Fm-251
    Alpha from Md-255
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)