91-Pa-220  basic  element

91-protactinium-220 Atomic Mass: 220.0218765 +- 0.0000610 amu Excess Mass: 20377.819 +- 56.838 keV Binding Energy: 1684119.039 +- 56.839 keV Beta Decay Energy: B- -2641.000 +- 209.000 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. Half life: 0.78 us Mode of decay: Alpha to Ac-216 Decay energy: 9.830 MeV Mode of decay: EC to Th-220 Branch ratio: 3.0E-7 % Decay energy: 5.720 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)