8
2
He
element 		Information about Helium-8:

(no NIST x-ray data)(no NIST attenuation data)
WikipediaNeutron Cross SectionsX-Ray TransitionsX-Ray Attenuation
    Mass-Energy Data:

    Atomic Mass:8.033922±0.000008amu
    Excess Mass (Δ):31.597983±0.007077MeV
    Binding Energy:31.407892±0.007077MeV
    β- Decay Energy:10.651789±0.007094MeV
"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:

  • Spin: 0+
  • Half life: 119.0 ms ( 0.119 sec., λ = 5.82477 s-1)
  • Mode of decay:
    β-
     to
    8
    3
    Li
       (Q = 10.653 MeV)
  • Mode of decay: β- +
    1
    0
    n to
    7
    3
    Li
       (Q = 0 8.619 MeV)   Branch ratio: 16.000 %

  • Possible parent nuclides:
    1
    0
    n emission from
    9
    2
    He
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)