element
Information about Lithium-12:

(no NIST x-ray data)(no NIST attenuation data)
WikipediaNeutron Cross SectionsX-Ray TransitionsX-Ray Attenuation

    Mass-Energy Data:

    Atomic Mass:12.053780±0.001070amu #
    Excess Mass (Δ):50.096000±0.997000MeV #
    Binding Energy:44.413000±0.997000MeV #
    β- Decay Energy:25.019000±0.997000MeV #
"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.