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¹⁰He has not been observed: see (1974AJ01). The calculated mass excess of ¹⁰He is 53.34 MeV based on the modified form of the mass equation: ¹⁰He is then unstable with respect to breakup into ⁹He + n and ⁸He + 2n by 0.78 and 4.60 MeV (1975JE02). See also (1973VO1D, 1974TH01) and (1974IR04, 1975BE31, 1976IR1B, 1976VA29, 1978KO1H, 1978NA07; theor.).