87-Fr-209  basic  element

87-francium-209 Atomic Mass: 208.9959154 +- 0.0000335 amu Excess Mass: -3804.760 +- 31.194 keV Binding Energy: 1622646.481 +- 31.196 keV Beta Decay Energy: B- -5615.000 +- 128.000 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: 50.0 s Mode of decay: Alpha to At-205 Branch ratio: 89.00 % Decay energy: 6.777 MeV Mode of decay: Electron capture to Rn-209 Branch ratio: 11.00 % Decay energy: 5.160 MeV Possible parent nuclides: Alpha from Ac-213 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) Magnetic Dipole Moments and Electric Quadrupole Moments Ex(kev) T1/2 Spin      m(nm)      Q(b)      Ref. Std. Method Reference 0 50 s 9/2- +3.95(8) [211Fr] ABLS PL 163B 66 (85)/PS 34 624 (86) -0.24(2) st ABLS PL 163B 66 (85) N. J. Stone, Table of Nuclear Magnetic Dipole and Electric Quadrupole Moments, to be published.  2000 Courtesy of T. Burrows at BNL/NNDC.