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The mass excess of ⁷B adopted by (1997AU04) is 27.870 ± 0.070 MeV. It was obtained by averaging the values of 27.94 ± 0.10 MeV from the ¹⁰B(³He, ⁶He)⁷B reaction (1967MC14, 1988AJ01) and the value 27.800 ± 0.10 MeV obtained in the ⁷Li(π⁺, π^-)⁷B reaction (1981SEZR). The width of the ground state is Γ = 1.4 ± 0.2 MeV: see (1967MC14, 1988AJ01). ⁷B is unbound with respect to ⁶Be + p, ⁵Li + 2p and ⁴He + 3p by 2.21, 1.61 and 3.38 MeV, respectively.

The predicted mass excess for ⁷B based on the isobaric multiplet mass equation using the T = 3/2 level energies in ⁷He, ⁷Li and ⁷Be is 27.76 ± 0.17 MeV (1967MC14). See also the early references cited in (1988AJ01, 1984AJ01, 1979AJ01, 1974AJ01). Recent cross section measurements for ⁷Li(π⁺, π^-)⁷B (1998PA40) were used to deduce information on ⁷B proton halo features. Measurements at E_π = 30 - 90 MeV reported by (2000DR19) were used to deduce energy-dependent features. Theoretical studies relevant to ⁷B include work on the spherical properties of nuclei (1995JA06, 1997AB27); Skyrme Hartree-Fock model calculations (1997BA54); Coulomb-energy studies (1997PO12); and large-basis shell-model calculations of level energies and other properties (1998NA17).