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 WWW TUNL    ## 8B (1988AJ01)

(See Energy Level Diagrams for 8B)

GENERAL: See also (1984AJ01) and Table 8.9 [Table of Energy Levels] (in PDF or PS) here.

Model calculations: (1983SH38).

Special states: (1982PO12, 1988KH03).

Complex reactions involving 8B: (1982AL08, 1983OL1A, 1984GR08, 1986HA1B, 1987TAZU, 1988AR05, 1988KI05).

Astrophysical questions: (1984HA1B, 1985BO1E, 1985GI1C, 1985KL1A, 1985LA1C, 1988BA86).

Reactions involving pions: (1983SP06).

Hypernuclei: (1983SH38).

Other topics: (1985AN28).

Ground state of 8B: (1983ANZQ, 1985AN28, 1986GL1A, 1987VA26, 1988AR05, 1988VA03)

μ = 1.0355 ± 0.0003 nm: see (1978LEZA).

 1. 8B(β+)8Be Qm = 17.979

The β+ decay leads mainly to 8Be*(3.0). The mean of half-lives listed in (1974AJ01) is 770 ± 3 msec; log ft= 5.6. There is also a branch to 8Be*(16.63): see (1986WA01) and reactions 24 and 25 in 8Be. Log ft= 3.3. See also (1985GR1A) and (1986QUZZ; theor.).

 2. 6Li(d, π-)8B Qm = -135.267

At Ed = 300 and 600 MeV 8B*(0, 0.77, 2.32) are populated: see (1984AJ01).

 3. 6Li(3He, n)8B Qm = -1.975

Angular distributions for the n0 group have been reported at E(3He) = 4.8 to 5.7 MeV: L= 0. Two measurements for the Ex of 8B*(0.77) are 767 ± 12 and 783 ± 10 keV [Γ = 40 ± 10 keV]: see (1974AJ01) and 9B.

 4. 7Li(p, π-)8B Qm = -140.293

Angular distributions and analyzing powers have been measured for the transitions to 8B*(0, 0.77, 2.32) at Epol. p = 199.2 MeV: the Ay to 8B*(2.32) is characteristic of that to a stretched high-spin, two-particle one-hole final state [Jπ of 8B*(2.32) is 3+] (1987CA06). See also (1987CA05).

 5. 7Li(7Li, 6H)8B Qm = -35.01

See 6H.

 6. 7Be(p, γ)8B Qm = -0.138

Absolute cross sections have been measured for Ep = 134 keV to 10.0 MeV. A resonance is observed at Ep = 723 keV [ER(c.m.) = 632 ± 10 keV; Ex = 770 ± 10 keV], Γc.m. = 37 ± 5 keV [assuming Γp ≫ Γγ] and σpeak = 1.18 ± 0.12 μb. Γγ is then 25 ± 4 meV. The zero-energy cross-section factor S17(0) = 0.0238 ± 0.0023 keV · b (1983FI13). See (1979AJ01) for the earlier work, and the discussion in (1986BA38). See also (1984AJ01), (1984HA1F, 1987SA1L) and (1982BA1J, 1982KA1E, 1983BA45, 1983FO1A, 1983HA1B, 1984DA1H, 1984HA1M, 1984YA1A, 1985BA1Q, 1985CA41, 1985FI1D, 1986FI15, 1987KI01, 1987RO25, 1988BA86, 1988BA29, 1988FO1A; astrophysics).

 7. 7Be(d, n)8B Qm = -2.087

See (1983HA17, 1985HA40).

 8. 10B(p, t)8B Qm = -18.530

At Ep = 49.5 MeV [see (1974AJ01)] and 51.9 MeV (1983YA05) angular distributions have been measured for the tritons to 8B*(0, 2.32): L = 2 and L = 0 + 2 leading to Jπ = 2+ and 3+, respectively. Measurements of Ex for 8B*(2.32) yield 2.29 ± 0.05 MeV, 2.34 ± 0.04 MeV [Γlab = 0.39 ± 0.04 MeV]. 8B*(0.77) is also observed: see (1974AJ01).

 9. 11B(3He, 6He)8B Qm = -16.913

At E(3He) = 72 MeV the first T= 2 state is observed at Ex = 10.619 ± 0.009 MeV, Γ < 60 keV: dσ/ dΩ (lab) = 190 nb/sr at θlab = 9°. No other states are observed within 2.4 MeV of this state. 8B*(0, 0.77, 2.32) have also been populated: see (1979AJ01).  