91-Pa-216  basic  element

91-protactinium-216 Atomic Mass: 216.0191096 +- 0.0001132 amu Excess Mass: 17800.520 +- 105.438 keV Binding Energy: 1654411.046 +- 105.438 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. Half life: 0.20 s Mode of decay: Alpha to Ac-212 Branch ratio: ~98.00 % Decay energy: 8.100 MeV Mode of decay: EC to Th-216 Branch ratio: ~2.00 % Decay energy: 7.510 MeV 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)