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GENERAL: See also (74AJ01) and Table 9.9 [Table of Energy Levels] (in PDF or PS).

Model calculations: (HO77M, OK77, HO78D).

Special levels: (IR74A, WI75D, IR76C, HO78D).

Astrophysical questions: (SI77D).

Pion reactions: (KA74D).

Other topics: (HA74W, IR74A, IR76C).

Ground state properties: (BE75Q, OK77).

1. (a) 6Li(3He, n)8B	Qm = -1.975	Eb = 16.603
(b) 6Li(3He, p)8Be	Qm = 16.7878
(c) 6Li(3He, d)7Be	Qm = 0.113
(d) 6Li(3He, t)6Be	Qm = -4.306
(e) 6Li(3He, 3He)6Li
(f) 6Li(3He, p)4He4He	Qm = 16.8797

The total cross section for reaction (a) increases monotonically from threshold to ~ 7 mb at 3.8 MeV. It then decreases monotonically from ~ 20 mb at E(³He) = 5.5 MeV to 7.6 MeV (MC75A, MC74H) and the decrease continues in the range E(³He) = 8.9 to 26.5 MeV (MA73AA). See also ⁸B.

The excitation functions for protons leading to ⁸Be*(0, 2.9) [p₀, p₁] have been measured for E(³He) = 0.9 to 17 MeV (reaction (b)): see (74AJ01). Resonances are reported at E(³He) = 1.6 MeV [J^π = 3/2^- or 5/2^- (VI69C), Γ = 0.25 MeV] and 3.0 MeV (Γ = 1.5 MeV) (SC56F). Total cross sections have been measured for the p₁ and p₂ groups for E(³He) = 3 - 6 MeV (GO76P). Polarization measurements are reported at E(³He) = 14 MeV (AS77C, IR77: p₀, p₁). See also ⁸Be.

The yields of 0.43 and 0.48 MeV γ-rays (reaction (c)) for E(³He) = 0.5 to 1.3 MeV are reported to show the excitation of ⁹B*(17.20 ± 0.02) with Γ = 110 ± 30 keV, J^π = 1/2⁺, 3/2⁺; T = 1/2 (AL70K). See also ⁷Be and (KA76F).

Excitation functions for t₀ (reaction (d)) have been measured for E(³He) = 10 to 16 and 23.3 to 25.4 MeV: see (74AJ01). See also ⁶Be. For reaction (e) see (GI72D). See also ⁶Li. The total cross section for reaction (f) has been measured for E(³He) = 3 to 6 MeV (GO76P). The yield of α - α coincidences [to ⁵Li_g.s.] has 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).

2. 6Li(α, n)9B

Qm = -3.975

Angular distributions at E_α = 8.0, 10.0, 12.0 and 14.0 MeV all display strong forward peaking (ME63B). 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 ground state group (BA64V). See also ¹⁰B.

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

Qm = 0.809

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) (KI66).

4. (a) 7Li(3He, n)9B	Qm = 9.352
(b) 7Li(3He, np)8Be	Qm = 9.537

For E(³He) to 12.5 MeV this reaction populates ⁹B*(0, 2.4, 2.8, (7.0)) (DU63A) and levels at 12.06 ± 0.06 [0.8 ± 0.2], 14.01 ± 0.07 [0.39 ± 0.11], 14.670 ± 0.016 [< 0.045], 16.024 ± 0.025 [0.180 ± 0.016], 17.19 and 17.63 MeV (DI65) [widths in brackets].

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) (AD71A, AD72A, MC76H).

The n₀ angular distribution has been measured at E(³He) = 3.1 MeV. A state at E_x = 4.8 ± 0.1 MeV, Γ = 1.0 ± 0.2 MeV is also reported (GU70I). See also (RA76K, SL76C) and ¹⁰B.

5. 7Be(d, p)8Be

Qm = 16.675

Eb = 16.490

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 = -1.850
(b) 9Be(p, pn)8Be	Qm = -1.6652

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 by a number of groups: see (74AJ01) and (CH78D). 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 (74AJ01)] and at 22.8 MeV (CA75F: quasi elastic). See also (WA78B). A study of reaction (b) at E_p = 5.5 MeV is said to suggest a (19 ± 5)% decay of ⁹B*(2.4) to ⁸Be_g.s. (CH78D): see, however, reaction 13. See also (BO74, AN76A, CA76D, JE77, LO77D, BY78, BY78B, GO78, LO78A) and reactions 15 and 16 in ¹⁰B.

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

Qm = -1.0860

Angular distributions have been measured in the range E(³He) = 3.0 to 25 MeV [see (74AJ01)] and at 217 MeV (WI76A: t₀, t₁). At E(³He) = 39.8 MeV, ⁹B_g.s. is strongly populated and ⁹B*(2.4, 14.7) are also observed. There is some indication that other known ⁹B states are also populated (BA69F). See also (UE76A, LO74F) and ¹²C in (75AJ02, 80AJ01).

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

Qm = -4.575

At E(⁶Li) = 30.8 and 31.8 MeV the ground state of ⁹B is strongly excited. ⁹B*(2.4) is also observed (CH70F, CH71O). A partial angular distribution for the ground state transition is reported at the higher energy by (CH71O).

9. 9C(β+)9B --> 8Be + p	Qm = 16.681
--> 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 in the ⁹C decay via ⁵Li + α: see (ES72).

10. 10B(γ, n)9B

Qm = -8.436

See ¹⁰B.

11. 10B(p, d)9B

Qm = -6.211

Observed groups are displayed in Table 9.11 (in PDF or PS) (KU68E, BA69L, SQ70). See also (GU77G; α to ⁹B*(0, 2.36); E_p = 16.7 and 17.7 MeV).

12. 10B(d, t)9B

Qm = -2.179

Angular distributions have been measured at E_d = 11.8, 13.5 and 28 MeV [see (74AJ01)], at 13.6 MeV (ZA73B: t₀) and at E_d-bar = 15 MeV (LU74B: t₀, t₁). S for ⁹B*(0, 2.4) are 0.66 and 0.58, respectively (LU74B). See also (ZA75A), (DA74B; theor.) and ¹²C in (75AJ02, 80AJ01).

13. (a) 10B(3He, α)9B	Qm = 12.142
(b) 10B(3He, αp)8Be	Qm = 12.3273

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 [see Table 9.11 (in PDF or PS) in (66LA04) for other values]. 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 MeV (CA66C: α₀) and 33.7 MeV (SQ71B: α₀, α_2.4, α_11.8). DWBA does not seem to give a good description of the transition to ⁹B*(11.8) (SQ71B).

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 < 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). A number of additional states of ⁹B are reported by (FO74). See also (LO74F) and (74AJ01).

14. 10B(16O, 17O)9B

Qm = -4.292

See (OK68C).

15. 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). See also (BE75CC) and reaction 42 in ⁹Be.

16. (a) 12C(p, α)9B	Qm = -7.552
(b) 12C(p, p)4He4He4He	Qm = -7.2748

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): see (74AJ01). The angular distribution to ⁹B*(6.97) is consistent with J^π = 7/2^-, Γ ~ 2 MeV (MA72F: E_p = 54.1 MeV). 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 (DA78I). For reaction (b) see (74AJ01). See also ¹²C in (75AJ02, 80AJ01), ¹³N in (76AJ04) and (HA78; theor.).

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

Qm = -11.572

Angular distributions of ⁶Li ions have been obtained at E(³He) = 30.0 and 40.7 MeV (OH72A). See also (74AJ01).