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USNDP

9He (1979AJ01)


(Not illustrated)

9He has not been observed: see (1974AJ01). It is predicted to be particle unstable. Particle instability with respect to 8He + n, 7He + 2n and 6He + 3n implies atomic mass excesses greater than 39.667, 42.253 and 41.808 MeV, respectively. The calculated mass excess of 9He is 43.49 MeV based on the modified form of the mass equation (1975JE02). See also (1974TH01) and (1974IR04, 1975BE31, 1976IR1B; theor.).