123
57
La
element 		Information about Lanthanum-123:

WikipediaNeutron Cross SectionsX-Ray TransitionsX-Ray Attenuation
    Mass-Energy Data:

    Atomic Mass:122.926240±0.000430amu #
    Excess Mass (Δ):-68.707000±0.401000MeV #
    Binding Energy:1016.886000±0.401000MeV #
    β- Decay Energy:-8.635000±0.643000MeV #
"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.
Radioactive Decay Data:

  • Half life: 17 s ( 17 sec., λ = 0.0407734 s-1)
  • Mode of decay:
    E.C.
     to
    123
    56
    Ba
       (Q = 6.900 MeV)

  • Possible parent nuclides:
    E.C. +
    1
    1
    p+ from
    124
    59
    Pr
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)