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9B (1984AJ01)
(See Energy Level Diagrams for 9B)
GENERAL: See also (1979AJ01) and Table 9.9 [Table of Energy Levels] (in PDF or PS).
Model calculations: (1978AR1H, 1979LA06, 1979MA1J, 1981KO1Q).
Special states: (1981KO1Q).
Reactions involving pions: (1978WA1B, 1979AL1J, 1982EL07, 1982HI02, 1983HU02).
Hypernuclei: (1978PO1A, 1978SO1A, 1979MA1L, 1981WA1J, 1982KO11).
Other topics: (1979BE1H, 1979LA06, 1982NG01).
Ground state of 9B: (1982NG01).
| 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] (1978AL37). 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 (1979AJ01), 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 (1980EL02). 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 (1974AJ01, 1979AJ01), and 8Be. See also (1979SL01). Polarization measurements are also reported at E(pol. 6Li) = 21 MeV (1983KO04; VAP; p0). A resonance in the excitation function for deuterons (reaction (d)) is observed corresponding to 9B*(17.6) (1979BU1E) [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 (1981BA38). See also (1979AJ01), 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 (1974AJ01). 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) (1981BA37) (reaction (f)). The elastic scattering has also been studied for E(3He) = 0.7 to 2.0 MeV (1979BU1E). See also 6Li and 6Be.
The α-α coincidences from the 5Lig.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 (1978GU15). Polarization measurements of the α-particles to 5Li*(0, 16.7) are reported at E(pol. 3He) = 33.3 MeV (1981BA38). For reaction (h) see also (1979AJ01). See also (1982LA20), (1979KA1G, 1981HO1E) and (1980LE06, 1982HI02, 1982LE10; theor.).
| 2. 6Li(α, n)9B | Qm = -3.977 |
At Eα = 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 (1974AJ01). 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 (1974AJ01).
| 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 Ex = 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 Qm) [< 0.045], 16.024 ± 0.025 [0.180 ± 0.016], 17.19 and 17.63 MeV [Γ in brackets]: see (1974AJ01). 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 (1974AJ01). Angular distributions have been measured at E(3He) = 1.56 to 5.27 MeV: see (1974AJ01).
| 5. 7Be(d, p)8Be | Qm = 16.6738 | Eb = 16.489 |
For Ed = 0.75 to 1.70 MeV, resonances in the yields of protons are observed at Ed = 0.900 ± 0.025 MeV (p0, p1) and 1.475 ± 0.010 MeV (p1 only) with Γc.m. = 120 ± 40 and 71 ± 8 keV, respectively [9B* = 17.19 and 17.64 MeV] (1960KA17).
| 6. (a) 9Be(p, n)9B | Qm = -1.851 | |
| (b) 9Be(p, pn)8Be | Qm = -1.6655 |
At Ep = 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 Ex < 7.1 MeV (1970AN07). Additional states have been reported: see (1979AJ01) and the comments in (1978JE01). See also (1983BY01). The width of the ground state is 540 ± 210 eV (1964TE01).
Angular distributions have been reported at many energies in the range Ep = 3.5 to 49.3 MeV [see (1979AJ01)] and at 8.15 to 16.98 MeV (1983BY01; n0). At Ep = 10 to 24 MeV reaction (b) does not appear to involve states of 9B (1978JE01) [see 9Be]: see, however, (1979AJ01). For polarization and yield measurements see reactions 13 and 14 in 10B. See also (1978BA1F, 1979WA1E, 1979WA1F; applications) and (1979BY01, 1980BA62, 1983GU1G; 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 (1974AJ01, 1979AJ01). At E(3He) = 39.8 MeV, 9Bg.s. is strongly populated and 9B*(2.4, 14.7) are also observed (1969BA06). See also 12C in (1980AJ01).
| 8. 9Be(6Li, 6He)9B | Qm = -4.575 |
At E(6Li) ≈ 31 MeV 9Bg.s. is strongly excited. 9B*(2.4) is also populated: see (1974AJ01).
| 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) (1972ES05). It is not possible to determine ft values since some of the 9B states involved decay via 5Li + α: (1972ES05).
| 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 (1979AJ01).
| 12. 10B(d, t)9B | Qm = -2.180 |
Angular distributions have been measured at Ed = 11.8 to 28 MeV. S for 9B*(0, 2.4) are 0.66 and 0.58, respectively. See (1974AJ01, 1979AJ01).
| 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 (1966LA04). Measurements by (1968KR02) determine Ex = 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 Ex ≈ 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 < Ex < 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) (1968KR02). 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) [θ2f < 5.1 x 10-3] [it decays to 5Li(0) by α-emission] while the second state, Ex = 2.71 ± 0.03 MeV [Γ = 0.71 ± 0.06 MeV] decays almost 100% by that channel [θ2d = 0.74] (1966WI08). No other excited states of 9B with 3.5 < Ex < 9.5 MeV decay by proton emission to 8Be(0) (1968KR02). See also (1974AJ01).
| 14. 11B(p, t)9B | Qm = -11.409 |
At Ep = 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 Ex = 15.29 ± 0.04 and 15.58 ± 0.04 MeV (1971HA10). The first two T = 3/2 states have been observed at Ex = 14.6550 ± 0.0025 (1974KA15) and 17.076 ± 0.004 MeV [Γ = 22 ± 5 keV] (1974BE66).
| 15. 12C(π+, π+t)9B | Qm = -27.366 |
See (1979EL12).
| 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 Ep = 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 Ep = 54.1 MeV is consistent with Jπ = 7/2-, Γ ≈ 2 MeV: see (1974AJ01). Angular distributions involving the α0 and α* groups [to 4He*(20.1), 0+] to 9Bg.s. have been studied at Ep = 45.2 MeV (1980DA07). At Ep = 72.4 MeV, a study of the inclusive (p, dX) reaction shows a structure which, if attributed to 9B, would correspond to Ex ≈ 20.7 MeV (1981KO28). See also 13N (1981AJ01) and (1978GO14, 1981KA04; 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 (1974AJ01).
| 18. 12C(α, 7Li)9B | Qm = -24.898 |
At Eα = 65 MeV, 9Bg.s. and possibly 9B*(2.36, 2.79) are populated (1978SA26).
| 19. 12C(16O, 19F)9B | Qm = -15.665 |
See (1982LE1N).