91-Pa-231  basic  n-XS summary  XS graphs  element

91-protactinium-231 Atomic Mass: 231.0358789 +- 0.0000028 amu Excess Mass: 33420.973 +- 2.586 keV Binding Energy: 1759860.436 +- 2.605 keV Beta Decay Energy: B- -382.155 +- 3.220 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: 32760 years Mode of decay: Alpha to Ac-227 Decay energy: 5.149 MeV Mode of decay: 24NEC Branch ratio: 13E-10 % Mode of decay: SF Branch ratio: <=3E-10 % Possible parent nuclides: Beta from Th-231 Electron capture from U-231 Alpha from Np-235 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 3.3x10*4y (2-) 2.01(2) ENDOR PR 121 1630 (61) 84 44 ns 5/2+ +0.7(2) [231Pa] ME PL 69A 225 (78) N. J. Stone, Table of Nuclear Magnetic Dipole and Electric Quadrupole Moments, to be published.  2000 Courtesy of T. Burrows at BNL/NNDC.