87-Fr-216  basic  element

87-francium-216 Atomic Mass: 216.0031879 +- 0.0000138 amu Excess Mass: 2969.484 +- 12.886 keV Binding Energy: 1672371.496 +- 12.889 keV Beta Decay Energy: B- -307.886 +- 15.258 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: (1-) Half life: 0.70 us Mode of decay: Alpha to At-212 Decay energy: 9.175 MeV Mode of decay: EC to Rn-216 Branch ratio: <2.0E-7 % Decay energy: 2.729 MeV Meta state at 0.133 Mev Spin: (3-) Half life: 71 ns Mode of decay: Alpha to At-212 Branch ratio: >50.00 % Decay energy: 9.308 MeV Possible parent nuclides: Alpha from Ac-220 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)