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GENERAL: See (FO58D, TA60L, IN62, NA63E, BA64I, BA64GG, GR64C, ST64).

See also Table 8.18 [Table of Energy Levels] (in PDF or PS).

1. 8B(β+)8Be

Qm = 17.979

The beta decay leads mainly to ⁸Be*(2.9). Reported half lives are listed in Table 8.19 (in PDF or PS); taking τ_1/2 = 0.774 sec and Q = 17.979 - 2.90, ft = 4.41 x 10⁵ (BA65K). There is also observed a branch to a ⁸Be state at ~ 16.6 MeV; log ft = 2.9 (MA64D). See also (BA64GG) and ⁸Be.

2. 6Li(3He, n)8B

Qm = -1.975

Thresholds for production of slow neutrons are reported at E(³He) = 2.9661 ± 0.0017 MeV (DU58), 2.974 ± 0.010 MeV (FA59A), corresponding to the ground state of ⁸B, and at E(³He) = 4.16 ± 0.05 (DU58), 4.159 ± 0.030 MeV (FA59A), corresponding to an excited state at E_x = 0.789 ± 0.030 MeV with Γ_c.m. = 70 ± 40 keV. A threshold at 3.9 MeV reported by (DU58) is not confirmed by (FA59A).

Neutron time-of-flight spectra at E(³He) = 4 to 9 MeV show groups corresponding to ⁸B(0) and ⁸B*(0.8), with forward-peaked angular distributions, and to a new state at E_x = 2.17 ± 0.05 MeV (DI63). At E(³He) = 4.5 to 5.3 MeV, time-of-flight spectra locate the first excited state at 0.767 ± 0.012 (FA65B), 0.783 ± 0.010 MeV (MC65E: Γ = 40 ± 10 keV). See also (MO63I).

3. 7Be(p, γ)8B

Qm = 0.135

The cross section for proton capture is 0.48 ± 0.18 μb at E_p = 0.80 MeV and 0.50 ± 0.20 μb at E_p = 1.40 MeV (KA60). The relevance of this reaction in stellar energy production is discussed by (FO58D, KA60, BA63DD, BA64I, PA64E). See also (CH61C).

4. (a) 10B(p, t)8B	Qm = -18.532
(b) 9Be(p, 2n)8B	Qm = -20.426
(c) 12C(p, nα)8B	Qm = -26.130

See (AL50G).

5. (a) 10B(γ, 2n)8B	Qm = -27.014
(b) 11B(γ, 3n)8B	Qm = -38.470
(c) 12C(γ, p3n)8B	Qm = -54.426

See (SH52).