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GENERAL: (See also (79AJ01).)

See (BE79A, NG82).

Mass of ⁷B:This nucleus has been studied in the ⁷Li(π⁺, π^-)⁷B and ¹⁰B(³He, ⁶He)⁷B reactions. In the (π⁺, π^-) work (SE81I; preliminary) find the mass excess to be 27.80 ± 0.10 MeV and Γ for the ground state is 1.2 ± 0.2 MeV. In the earlier (³He, ⁶He) work [see (74AJ01)] M-A was reported to be 27.94 ± 0.10 MeV, Γ=1.4 ± 0.2 MeV. We adopt 27.87 ± 0.10 MeV, Γ = 1.3 ± 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 = 2.21), ⁵Li + 2p (Q = 1.61), ⁴He + 3p (Q = 3.58). 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: see (74AJ01).