87-Fr-203  basic  element

87-francium-203 Atomic Mass: 203.0010480 +- 0.0002460 amu # Excess Mass: 976.000 +- 229.000 keV # Binding Energy: 1569437.000 +- 229.000 keV # Beta Decay Energy: B- -7603.000 +- 325.000 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: (9/2-) Half life: 0.55 s Mode of decay: Alpha to At-199 Branch ratio: ~95.00 % Decay energy: 7.280 MeV Mode of decay: EC to Rn-203 Branch ratio: ~5.00 % Decay energy: 7.200 MeV Possible parent nuclides: Alpha from Ac-207 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)