87-Fr-208  basic  element

87-francium-208 Atomic Mass: 207.9971338 +- 0.0000840 amu Excess Mass: -2669.802 +- 78.212 keV Binding Energy: 1613440.200 +- 78.212 keV Beta Decay Energy: B- -4324.000 +- 160.000 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: 7+ Half life: 59.1 s Mode of decay: Alpha to At-204 Branch ratio: 90.00 % Decay energy: 6.770 MeV Mode of decay: Electron capture to Rn-208 Branch ratio: 10.00 % Decay energy: 6.990 MeV Possible parent nuclides: Alpha from Ac-212 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 58.6 s 7+ +4.75(10) [211Fr] ABLS PL 163B 66 (85)/PS 34 624 (86) 0.00(4) 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.