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GENERAL: See also (79AJ01) and Table 9.9 [Table of Energy Levels] (in PDF or PS).

Model calculations:(AR78G, LA79G, MA79F, KO81O).

Special states:(KO81O).

Reactions involving pions:(WA78C, AL79K, EL82A, HI82B, HU83C).

Hypernuclei:(PO78A, SO78D, MA79H, WA81D, KO82N).

Other topics:(BE79A, LA79G, NG82).

Ground state of ⁹B:(NG82).

1. (a) 6Li(3He, γ)9B	Qm = 16.601
(b) 6Li(3He, n)8B	Qm = -1.975	Eb = 16.601
(c) 6Li(3He, p)8Be	Qm = 16.7861
(d) 6Li(3He, d)7Be	Qm = 0.112
(e) 6Li(3He, t)6Be	Qm = -4.307
(f) 6Li(3He, 3He)6Li
(g) 6Li(3He, α)5Li	Qm = 14.91
(h) 6Li(3He, p)4He4He	Qm = 16.8779

The 90° yields of γ₀ and of γ to ⁹Be*(2.36) (reaction (a)) has been measured for E(³He) = 0.6 to 1.2 MeV [as have the 2 α-particles from the decay of ⁸Be*(16.6) (reaction (c)]: they are reported to show a resonance at E(³He) = 765 ± 5 keV [⁹B*(17.111)], attributed to ⁹B*(17.076) [T = 3/2] (AL78S). The total cross section for reaction (b) increases monotonically from threshold to ~ 7 mb at 3.8 MeV. It then decreases monotonically from ~ 20 mb at E(³He) = 5.5 to 7.6 MeV and also from 8.9 to 26.5 MeV: see (79AJ01), and ⁸B.

Absolute cross sections for protons (reaction (c)) to ⁸Be*(0, 2.9, 16.6, 16.9) as well as for the continuum protons (reaction (h)) have been measured for E(³He) = 0.5 to 1.85 MeV. Reaction rate parameters, < σν >, have been calculated for kT = 0.01 to 10.0 MeV (EL80A). Excitation functions for p₀ and p₁ have been measured for E(³He) = 0.9 to 17 MeV, and polarization measurements are reported at E(³He) = 14 MeV. Resonances are reported at E(³He) = 1.6 and 3.0 MeV [Γ = 0.25 and 1.5 MeV]: see (74AJ01, 79AJ01), and ⁸Be. See also (SL79). Polarization measurements are also reported at E(pol. ⁶Li) = 21 MeV (KO83B; VAP; p₀). A resonance in the excitation function for deuterons (reaction (d)) is observed corresponding to ⁹B*(17.6) (BU79B) [E(³He) = 0.7 to 2.0 MeV]. Polarization measurements at E(pol. ³He) = 33.3 MeV for the d₀ and d₁ groups are reported by (BA81LL). See also (79AJ01), and ⁷Be. Excitation functions for t₀ (reaction (e)) have been measured for E(³He) = 10 to 16 and 23.3 to 25.4 MeV: see (74AJ01). Polarization measurements are reported at E(pol. ³He) = 33.3 MeV for the t₀ group as well as for the ³He ions to ⁶Li*(0, 2.19) (BA81KK) (reaction (f)). The elastic scattering has also been studied for E(³He) = 0.7 to 2.0 MeV (BU79B). See also ⁶Li and ⁶Be.

The α-α coincidences from the ⁵Li_g.s. decay (reaction (g)) have been measured for E(³He) = 1.4 to 1.8 MeV: a resonance is observed at 1.57 ± 0.02 MeV [⁹B*(17.63)], Γ = 70 ± 20 keV (GU78E). Polarization measurements of the α-particles to ⁵Li*(0, 16.7) are reported at E(pol. ³He) = 33.3 MeV (BA81LL). For reaction (h) see also (79AJ01). See also (LA82I), (KA79Q, HO81D) and (LE80D, HI82B, LE82H; theor.).

2. 6Li(α, n)9B

Qm = -3.977

At E_α = 14.4 MeV, neutron groups are observed to ⁹B*(0, 2.4): the upper limit of the cross section to a state at ~ 1.7 MeV is 100 μb/sr or < 0.1 of the n₀ group: see (74AJ01). See also ¹⁰B.

3. 6Li(6Li, t)9B

Qm = 0.805

Angular distributions of the t₀ group have been measured for E(⁶Li) = 4.0 to 5.5 MeV and at 7.35 and 9.0 MeV. No evidence was observed for a group, corresponding to ⁹B*(1.6): see (74AJ01).

4. (a) 7Li(3He, n)9B	Qm = 9.351
(b) 7Li(3He, np)8Be	Qm = 9.5360

For E(³He) to 12.5 MeV this reaction populates ⁹B*(0, (1.6), 2.4, 2.8, (7.0)), and states at E_x = 4.8 ± 0.1 MeV [1.0 ± 0.2 MeV], 12.06 ± 0.06 [0.8 ± 0.2], 14.01 ± 0.07 [0.39 ± 0.11], 14.657 ± 0.005 (based on Q_m) [< 0.045], 16.024 ± 0.025 [0.180 ± 0.016], 17.19 and 17.63 MeV [Γ in brackets]: see (74AJ01). ⁹B*(14.66) is the first T = 3/2 state in ⁹B. Its decay properties are displayed in Table 9.6 (in PDF or PS) and compared with those of ⁹Be*(14.40): see reaction 9 in ⁹Be and (74AJ01). Angular distributions have been measured at E(³He) = 1.56 to 5.27 MeV: see (74AJ01).

5. 7Be(d, p)8Be

Qm = 16.6738

Eb = 16.489

For E_d = 0.75 to 1.70 MeV, resonances in the yields of protons are observed at E_d = 0.900 ± 0.025 MeV (p₀, p₁) and 1.475 ± 0.010 MeV (p₁ only) with Γ_c.m. = 120 ± 40 and 71 ± 8 keV, respectively [⁹B* = 17.19 and 17.64 MeV] (KA60C).

6. (a) 9Be(p, n)9B	Qm = -1.851
(b) 9Be(p, pn)8Be	Qm = -1.6655

At E_p = 20 MeV, ⁹B*(0, 2.4) are populated. The results are consistent with the excitation of ⁹B*(2.8) [Γ ~ 0.3 MeV] and ⁹B*(7.0) [Γ>1 MeV]. No other states are excited for E_x < 7.1 MeV (AN70C). Additional states have been reported: see (79AJ01) and the comments in (JE78A). See also (BY83). The width of the ground state is 540 ± 210 eV (TE64B).

Angular distributions have been reported at many energies in the range E_p = 3.5 to 49.3 MeV [see (79AJ01)] and at 8.15 to 16.98 MeV (BY83; n₀). At E_p = 10 to 24 MeV reaction (b) does not appear to involve states of ⁹B (JE78A) [see ⁹Be]: see, however, (79AJ01). For polarization and yield measurements see reactions 13 and 14 in ¹⁰B. See also (BA78BB, WA79E, WA79H; applications) and (BY79, BA80II, GU83B; theor.).

7. 9Be(3He, t)9B

Qm = -1.087

Angular distributions have been measured for E(³He) = 3.0 to 25 MeV and at 217 MeV: see (74AJ01, 79AJ01). At E(³He) = 39.8 MeV, ⁹B_g.s. is strongly populated and ⁹B*(2.4, 14.7) are also observed (BA69F). See also ¹²C in (80AJ01).

8. 9Be(6Li, 6He)9B

Qm = -4.575

At E(⁶Li) ~ 31 MeV ⁹B_g.s. is strongly excited. ⁹B*(2.4) is also populated: see (74AJ01).

9. 9C(β+)9B --> 8Be + p	Qm = 16.682
--> 5Li + α	Qm = 14.81

Several groups of delayed protons are observed indicating the involvement of a number of ⁹B states: see Table 9.10 (in PDF or PS) (ES72). It is not possible to determine ft values since some of the ⁹B states involved decay via ⁵Li + α: (ES72).

10. 10B(γ, n)9B

Qm = -8.437

See ¹⁰B.

11. 10B(p, d)9B

Qm = -6.212

See Table 9.11 (in PDF or PS). See also (79AJ01).

12. 10B(d, t)9B

Qm = -2.180

Angular distributions have been measured at E_d = 11.8 to 28 MeV. S for ⁹B*(0, 2.4) are 0.66 and 0.58, respectively. See (74AJ01, 79AJ01).

13. (a) 10B(3He, α)9B	Qm = 12.141
(b) 10B(3He, αp)8Be	Qm = 12.3258

Alpha-particle spectra show the excitation of ⁹B*(0, 2.4, 2.8, 11.8): see (66LA04). Measurements by (KR68) determine E_x = 2.361 ± 0.005 and 2.788 ± 0.030 MeV, Γ = 81 ± 5 and 548 ± 40 keV, respectively. There is some evidence for a state with E_x ~ 1.6 MeV, Γ ~ 0.7 MeV, but it is not conclusive, in agreement with the older work. No evidence is found for any narrow levels in ⁹B with Γ < / = 100 keV and 4 < E_x < 7 MeV: the upper limit to the intensity of the corresponding α-group is 1% of the intensity of the group to ⁹B*(2.4) (KR68). Angular distributions have been determined at E(³He) = 5.5 and 33.7 MeV.

In reaction (b) study of the decays of ⁹B*(2.4, 2.8) shows that ⁹B*(2.4) decays < 0.5% by proton emission to ⁸Be(0) [θ²_f < 5.1 x 10^-3] [it decays to ⁵Li(0) by α-emission] while the second state, E_x = 2.71 ± 0.03 MeV [Γ = 0.71 ± 0.06 MeV] decays almost 100% by that channel [θ²_d = 0.74] (WI66D). No other excited states of ⁹B with 3.5 < E_x < 9.5 MeV decay by proton emission to ⁸Be(0) (KR68). See also (74AJ01).

14. 11B(p, t)9B

Qm = -11.409

At E_p = 45 MeV angular distributions have been obtained for the triton groups to ⁹B*(0, 2.36, 12.06, 14.01, 14.66, 16.02). In addition the spectra show some indication of the groups corresponding to ⁹B*(7.0, 17.19, 17.64). T = 1/2 states are reported at E_x = 15.29 ± 0.04 and 15.58 ± 0.04 MeV (HA71C). The first two T = 3/2 states have been observed at E_x = 14.6550 ± 0.0025 (KA74C) and 17.076 ± 0.004 MeV [Γ = 22 ± 5 keV] (BE74M).

15. 12C(π+, π+t)9B

Qm = -27.366

See (EL79C).

16. (a) 12C(p, α)9B	Qm = -7.552
(b) 12C(p, p)4He4He4He	Qm = -7.2747

Angular distributions have been measured for the α₀ group at E_p = 14.0 to 54.1 MeV. Alpha groups are also observed to ⁹B*(2.3, 2.9 ± 0.2, 6.97 ± 0.06). The angular distribution to ⁹B*(6.97) at E_p = 54.1 MeV is consistent with J^π = 7/2^-, Γ ~ 2 MeV: see (74AJ01). Angular distributions involving the α₀ and α* groups [to ⁴He*(20.1), 0⁺] to ⁹B_g.s. have been studied at E_p = 45.2 MeV (DA80). At E_p = 72.4 MeV, a study of the inclusive (p, dX) reaction shows a structure which, if attributed to ⁹B, would correspond to E_x ~ 20.7 MeV (KO81N). See also ¹³N (81AJ01) and (GO78S, KA81A; theor.).

17. 12C(3He, 6Li)9B

Qm = -11.570

Angular distributions of ⁶Li ions have been obtained at E(³He) = 30.0 and 40.7 MeV: see (74AJ01).

18. 12C(α, 7Li)9B

Qm = -24.898

At E_α = 65 MeV, ⁹B_g.s. and possibly ⁹B*(2.36, 2.79) are populated (SA78M).

19. 12C(16O, 19F)9B

Qm = -15.665

See (LE82K).