4 He
2 2
Half life: stable
Jp: 0+
Decay mode:
Sn (keV): 20577.62
Sp (keV): 19813.85
Abundance: 99.999863 3 %
Prod. mode: Naturally occurring
Literature cut-off date: 8-Oct-1991
Author(s): J.H. Kelley, D.R. Tilley, H.R. Weller and G.M. Hale
ENSDF citation: NP A541 1 (1992)