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1. 10B(3He, 6He)7B

Qm = -18.55

A ⁶He group corresponding to the unbound ground state of ⁷B has been identified at E(³He) = 50 MeV: M - A (⁷B) = 27.94 ± 0.10, Γ = 1.4 ± 0.2 MeV. The isobaric quartet mass law would predict M - A = 27.76 ± 0.17 MeV. ⁷B is unbound with respect to ⁶Be + p (Q = 2.27), ⁵Li + 2p (Q = 1.68), ⁴He + 3p (Q = 3.65). The expected single-particle width is Γ = 0.64 MeV: it is suggested that the two-proton and three-proton decays make an appreciable contribution to the width (MC67K). See also (GO60P, CE68A, ST68, GA69M, CA72P, CE72).