2-Helium
Nuclide weight or level energy spin & parity abundance half-life sig(J32) sig(J33) sig(J40)
-----------------------------------------------------------------------------------------------------------------
He-nat 4.002602 +- 0.000002 XXX
He- 3 3.01602932007 +- 0.00000000250 1/2+ 0.000134 stable XXX XXX XXX
He- 4 4.00260325413 +- 0.00000000006 0+ 99.999866 stable XXX XXX XXX
He- 6 6.018886648 +- 0.000000450 0+ 806.7MS 1
He- 8 8.033934307 +- 0.000000190 0+ 119.1MS 12
-----------------------------------------------------------------------------------------------------------------