87-Fr-204
 basic

 element
87-francium-204

  • Atomic Mass: 204.0005930 +- 0.0002220 amu #
  • Excess Mass: 552.000 +- 207.000 keV #
  • Binding Energy: 1577933.000 +- 207.000 keV #
  • Beta Decay Energy: B- -5481.000 +- 275.000 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: (3+)
  • Half life: 1.7 s
  • Mode of decay: Alpha to At-200
    • Branch ratio: ~80.00 %
    • Decay energy: 7.170 MeV
  • Mode of decay: EC to Rn-204
    • Branch ratio: ~20.00 %
    • Decay energy: 8.600 MeV

    Meta state at 0.041 Mev
  • Spin: (7+)
  • Half life: 2.6 s
  • Mode of decay: Alpha to At-200
    • Branch ratio: <=100.00 %
    • Decay energy: 0 7.211 MeV

    Meta state at 0.316 Mev
  • Spin: (10-)
  • Half life: ~1 s
  • Mode of decay: Alpha to At-200
    • Branch ratio: <=100.00 %
    • Decay energy: 0 7.486 MeV
  • Mode of decay: IT to Fr-204
    • Decay energy: 7.486 MeV

  • Possible parent nuclides:
    Alpha from Ac-208
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)