57-La-129  basic  element

57-lanthanum-129 Atomic Mass: 128.9126673 +- 0.0000551 amu Excess Mass: -81349.842 +- 51.295 keV Binding Energy: 1077956.340 +- 51.296 keV Beta Decay Energy: B- -5050.000 +- 200.000 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: 3/2+ Half life: 11.6 min Mode of decay: Electron capture to Ba-129 Decay energy: 3.720 MeV Meta state at 0.172 Mev Spin: 11/2- Half life: 0.56 s Mode of decay: IT Decay energy: 0.172 MeV Possible parent nuclides: Electron capture from Ce-129 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)