element
Information about Gadolinium-136:

WikipediaNeutron Cross SectionsX-Ray TransitionsX-Ray Attenuation

    Mass-Energy Data:

    Atomic Mass:135.947070±0.000750amu #
    Excess Mass (Δ):-49.304000±0.699000MeV #
    Binding Energy:1096.933000±0.699000MeV #
"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.