204
87
Fr
element 		Information about Francium-204:

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    Mass-Energy Data:

    Atomic Mass:204.000593±0.000222amu #
    Excess Mass (Δ):0.552000±0.207000MeV #
    Binding Energy:1577.933000±0.207000MeV #
    β- Decay Energy:-5.481000±0.275000MeV #
"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: (3+)
  • Half life: 1.7 s ( 1.7 sec., λ = 0.407734 s-1)
  • Mode of decay:
    α
     to
    200
    85
    At
       (Q = 7.170 MeV)   Branch ratio: ~80.00 %
  • Mode of decay: E.C. to
    204
    86
    Rn
       (Q = 8.600 MeV)   Branch ratio: ~20.00 %
    Meta state at 0.041 Mev
  • Spin: (7+) 1.7
  • Half life: 2.6 s ( 2.6 sec., λ = 0.266595 s-1)
  • Mode of decay:
    α
     to
    200
    85
    At
       (Q = 0 7.211 MeV)   Branch ratio: <=100.00 %
    Meta state at 0.316 Mev
  • Spin: (10-) .6
  • Half life: 1 s ( 1 sec., λ = 0.693147 s-1)
  • Mode of decay:
    α
     to
    200
    85
    At
       (Q = 0 7.486 MeV)   Branch ratio: <=100.00 %
  • Mode of decay: γ (IT) to
    204
    87
    Fr
       (Q = 7.486 MeV)

  • Possible parent nuclides:
    α from
    208
    89
    Ac
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)