A=10B (1974AJ01)

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¹⁰B (1974AJ01)

(See Energy Level Diagrams for ¹⁰B)

GENERAL: See also (1966LA04) and Table 10.5 [Table of Energy Levels] (in PDF or PS).

Shell model: (1961KO1A, 1965CO25, 1966HA18, 1966MA1P, 1966WI1E, 1967CO32, 1967EV1C, 1967HS1A, 1967PI1B, 1968GO01, 1969VA1C, 1970CO1H, 1971NO02, 1972LE1L, 1973HA49, 1973JO1K, 1973KU03, 1973SA30).

Cluster and α-particle model: (1965NE1B, 1967TA1C, 1969BA1J, 1969HU1F, 1969NAZY, 1970NA06, 1971NO02, 1972LE1L, 1973KU03).

Special levels: (1967CO32, 1967HS1A, 1968GO01, 1968HE1G, 1969CO1H, 1969HA1F, 1971NO02, 1972VA36, 1973SA30).

Electromagnetic transitions: (1962MO1A, 1965CO25, 1967HS1A, 1967KU1E, 1968BI1C, 1968HE1G, 1968KU1D, 1969HA1F, 1969VA1C, 1972BE1E, 1972EV03, 1972LO1D, 1972TA21, 1972NA05, 1973HA49, 1973SA30).

Astrophysical questions: (1968HA1C, 1970BA1M, 1972CL1A, 1972KO1E, 1973AU1H, 1973LA19, 1973RE1G, 1974AU1A).

Special reactions: (1968YI01, 1969DA1D, 1969GA18, 1969YI1A, 1971AR02, 1971BA16, 1972OB1B, 1972PN1A, 1973KU03, 1973LA19, 1973VO1G).

Muon capture: (1967BA78, 1967BU1D, 1968BA2G, 1969WU1A, 1970FA15, 1971DE2D, 1972BU29, 1973BU20, 1973MU11, 1974MU1J).

Pion capture and reactions: (1965CH12, 1968BA2G, 1968BO32, 1968NO1A, 1968RI1H, 1968WI1B, 1968TA1C, 1969BU1C, 1969CH1C, 1969CH19, 1969GO1C, 1969KAZZ, 1969MO1E, 1970CH1F, 1970BA1E, 1971CA01, 1971CA1J, 1971KA62, 1972FU1C^†, 1972HU1A, 1972SW1A, 1973KA1D, 1973NY04, 1973UL1D).

^† (1972FU1C) observe the γ-de-excitation of ¹⁰B*(0.7, 1.7, 2.2) formed in ratio 2:1:1 when π^- are stopped in a carbon target.

Kaon capture and reactions: (1972BA09, 1973CH1M).

Other topics: (1965CO25, 1966HA18, 1966WI1E, 1967CA17, 1967EV1C, 1967MI1A, 1968GO01, 1968JO1C, 1968RI1H, 1969HO1M, 1970CO1H, 1970FO1B, 1972AN05, 1972CA37, 1972LE1L, 1972PN1A, 1973CL09, 1973CO16, 1973JO1K, 1973JU2A, 1973KU03, 1973MA48, 1973RO1R).

Ground-state properties: (1965CO25, 1966MA1P, 1966WI1E, 1967BA78, 1967SH05, 1967SH14, 1968PE16, 1969LE1B, 1969VA1C, 1969WU1A, 1970HI08, 1971TA1A, 1972LE1L, 1972VA36, 1973CO1P, 1973MA1K, 1973SA30, 1973SU1B).

J = 3 (1967BE1T);

μ = +1.8007 nm (1969FU11, 1971SH26);

Q = +0.08 b (1969FU11); [+0.0847 ± 0.0006 b (1970NE05); theor.]; see also (1968SC18).

1. ⁶Li(α, γ)¹⁰B Q_m = 4.460

Six resonances are observed in the range E_α = 0.5 to 3.8 MeV, corresponding to ¹⁰B*(4.77, 5.11, 5.17, 5.18, 5.92, 6.03): see Table 10.7 (in PDF or PS) (1957ME27, 1961SP02, 1966AL06, 1966FO05, 1966SE02, 1971AU1H). Some weak effects corresponding to ¹⁰B*(6.13) may also be present (1966FO05). Angular distribution and branching ratio measurements are consistent with 3⁺ for ¹⁰B*(4.77) and 2^-, 2⁺, 1⁺, 2⁺ and 4⁺ for the five higher states: see (1966LA04) and (1966AL06, 1966FO05, 1966SE02). The results are in good agreement with the I.P.M. calculations of (1965CO25). See also (1967WA1C).

2. (a) ⁶Li(α, n)⁹B Q_m = -3.975 E_b = 4.460
(b) ⁶Li(α, p)⁹Be Q_m = -2.1251
(c) ⁶Li(α, d)⁸Be Q_m = -1.5656

The excitation functions for neutrons (1963ME08: from threshold to E_α = 15.5 MeV) and for d₀ particles (1963BL20: E_α = 9.5 to 11.4 MeV) do not show resonance structure. See also ⁸Be, ⁹Be and ⁹B.

3. ⁶Li(α, α)⁶Li E_b = 4.460

Reported anomalies in the elastic scattering are listed in Table 10.8 (in PDF or PS) (1962DE10, 1967ME08, 1971BA41). See also (1965SI1B). The 1⁺ assignment for ¹⁰B*(5.18) supports the proposal by (1961TR1B) that it is a member of the doublet formed by two-nucleon excitation into the 2s shell, whose other member is the J^π = 0⁺; T = 1 state at 7.56 MeV.

Excitation functions of α₀ have been reported since (1966LA04) at E_α = 2.0 to 3.7 MeV (1967ME08), 2.5 to 4.5 MeV (1972BO07), 3.3 to 5.0 MeV (1971BA41) and 13.3 to 18.0 MeV (1970BI1B, 1971BI12). In the high-energy work, the yield curves are generally monotonically decreasing functions of energy except in the region E_α = 15.7 to 17 MeV, where a broad resonance structure is observed which may correspond to weak excitation of ¹⁰B*(14.0) (1970BI1B, 1971BI12). Excitation functions for α₀ and α₁ [to ⁶Li*(2.19)] at E_α = 9.5 to 12.5 MeV do not show resonance structure (1963BL20). See also (1969TR1B, 1972RI10; theor.).

4. ⁶Li(⁶Li, d)¹⁰B Q_m = 2.987

Angular distributions of deuteron groups have been determined at E(⁶Li) = 2.4 to 9.0 MeV (d₀, d₁, d₃) and 7.35 and 9.0 MeV (d₄, d₅) (1966KI09). The d₂ group is also observed but its intensity is weak: see (1960MO17, 1961MO02, 1966KI09). For τ_m measurements see Table 10.9 (in PDF or PS) (1969TH01). See also (1971PO1D), (1966BR1G), (1966RO1E; theor.) and ¹²C in (1975AJ02).

5. ⁶Li(⁷Li, t)¹⁰B Q_m = 1.993

Angular distributions of the t₀ and t₁ groups have been measured at E(⁶Li) = 3.3 MeV (1967GA06) and E(⁷Li) = 3.78 to 5.95 MeV (1967KI03). For τ_m measurements see Table 10.9 (in PDF or PS) (1969TH01). See also (1968DA20), (1972GA1E), (1966LA04) and ¹³C in (1976AJ04).

6. ⁶Li(⁹Be, ⁵He)¹⁰B Q_m = 1.99

See (1962MC12, 1963NO02).

7. ⁷Li(³He, γ)¹⁰B Q_m = 17.788

Capture γ-rays have been observed for E(³He) = 0.8 to 3.0 MeV (1965PA02, 1971LI20) and 3.0 to 6.0 MeV (1968LI03). The γ₀ and γ₅ yields [to ¹⁰B*(0, 4.77)] show resonances at E(³He) = 1.1 and 2.2 MeV [E_res = 0.92 and 2.1 MeV: see (1971LI20)], the γ₁ and γ₄ yields [to ¹⁰B*(0.72, 3.59)] at 1.4 MeV and the γ₄ yield at 3.4 MeV: see Table 10.10 (in PDF or PS) (1965PA02, 1968LI03, 1971LI20). Both the 1.1 and 2.2 MeV resonances [¹⁰B*(18.4, 19.3)] appear to result from s-wave capture; the subsequent decay is to two 3⁺ states [¹⁰B*(0, 4.77)]. Therefore the most likely assignment is J^π = 2^-; T = 1 for both [there appears to be no decay of these states via α₂ to ⁶Li*(3.56) which has J^π = 0⁺; T = 1: see reaction 11] (1965PA02, 1971LI20). The assignment for ¹⁰B*(18.8) [1.4 MeV resonance] is 1⁺ or 2⁺ but there appears to be α₂ decay and therefore J^π = 2⁺. ¹⁰B*(20.2) [3.4 MeV resonance] has an isotropic angular distribution of γ₄ and therefore J^π = 0⁺, 1^-, 2^-. The γ₂ group resonates at this energy which eliminates 2^-, and 0⁺ is eliminated on the basis of the strength of the transition which is too large for E2 (1971LI20).

8. ⁷Li(³He, n)⁹B Q_m = 9.353 E_b = 17.788

The excitation curve is smooth up to E(³He) = 1.8 MeV (1962SE1A, 1963DU12, 1966DI04) and the n₀ yield shows resonance behavior at E(³He) = 2.2 and 3.25 MeV, Γ_lab = 270 ± 30 and 500 ± 100 keV. No other resonances are observed up to E(³He) = 5.5 MeV (1966DI04). See also Table 10.10 (in PDF or PS).

9. ⁷Li(³He, p)⁹Be Q_m = 11.2027 E_b = 17.788

The yield of p₀ and p₂ has been measured for E(³He) = 0.60 to 1.25 MeV (1971ST35): it is suggested that ¹⁰B*(18.4) is formed. The yield of protons is relatively flat for E(³He) = 1.8 to 4.8 MeV with some indication of weak maxima at ≈ 2.3 and 3.3 MeV (1961WO05, 1972LI31). See also (1969SA04, 1970DI1F). The yield of γ-rays from the decay of the T = 3/2 state of ⁹Be at 14.39 MeV to ⁹Be*(0, 2.4) has been studied at E(³He) = 5.0 to 10.0 MeV: some suggestion is reported of a T = 2 state at E_x ≈ 23 MeV, Γ ≈ 0.5 MeV (1968HA1K: unpublished results; W.D. Harrison, private communication).

10. (a) ⁷Li(³He, d)⁸Be Q_m = 11.762 E_b = 17.788
(b) ⁷Li(³He, t)⁷Be Q_m = -0.8804

Yields of tritons have been measured for E(³He) = 0.65 to 1.25 MeV (1971ST35; d₀), 2.0 to 4.2 MeV (1969OR01; t₀), 8.0 to 10.0 MeV (1968MA1W; t₀, t₁) and 10 to 16 MeV (1969NU1A; t₀, t₁). A broad peak is reported at E(³He) ≈ 3.5 MeV (1969OR01). For reaction (a) see ⁸Be.

11. ⁷Li(³He, α)⁶Li Q_m = 13.3279 E_b = 17.788

Excitation functions have been measured at E(³He) = 1.3 to 5.4 MeV (1965FO07; α₀, α₁, α₂), 2.0 to 4.2 MeV (1969OR01; α₀), 2.5 to 4.2 MeV (1969OR01; α₂), 5.0 to 8.0 MeV (1970OR03; α₀, α₁, α₂) and 16.0 to 18.0 MeV (1971ZA07; α₀). The α₀ group (at 8°) shows a broad maximum at ≈ 2 MeV, a minimum at 3 MeV, followed by a steep rise which flattens off between E(³He) = 4.5 and 5.5 MeV. Integrated α₀ and α₁ yields rise monotonically to 4 MeV and then tend to decrease (1965FO07). Angular distributions give evidence of the resonances at E(³He) = 1.4 and 2.1 MeV seen in ⁷Li(³He, γ)¹⁰B: J^π = 2⁺ or 1^-; T = (1) for both [see, however, reaction 7]: Γ_α is small (1965PA03). The α₂ yield [to ⁶Li*(3.56), J^π = 0⁺; T = 1] shows some structure at E(³He) = 1.4 MeV and a broad maximum at ≈ 3.3 MeV (1965FO07, 1969OR01): see Table 10.10 (in PDF or PS).

12. ⁷Li(α, n)¹⁰B Q_m = -2.790

Angular distributions have been measured for the n₀ group at E_α = 4.78 to 7.85 MeV (1972VA02) and 13.5 and 13.9 MeV (1962KJ05), and for the n₁ group [to ¹⁰B*(0.7)] at E_α = 6.71 to 7.85 MeV (1972VA02). The n₂ group has also been seen in this reaction (1972VA02). Slow-neutron threshold measurements have been reported corresponding to the formation of ¹⁰B*(0, 0.72, (4.77), (6.42)): see (1957BI84, 1963ME08) and (1966LA04). The lifetime of ¹⁰B*(2.16), τ_m = 2.16 ± 0.43 psec: the "best" value for τ_m based on this and on other measurements [see Table 10.9 (in PDF or PS)] is 2.4 ± 0.3 psec corresponding to Γ_γ = 275 ± 35 μeV. The γ-decay of ¹⁰B*(2.15) involves E_γ = 415.1 ± 0.5 keV (2.15 → 1.74), 1435.6 ± 1.0 keV (2.15 → 0.72) and 719.1 ± 0.6 keV (0.72 → 0). The excitation energies for the first three excited states are then 719.1 ± 0.6, 1739.7 ± 1.5 and 2154.8 ± 1.2 keV (1970GA01). See also (1972DA32).

13. ⁹Be(p, γ)¹⁰B Q_m = 6.5853

Parameters of observed resonances are listed in Tables 10.11 (in PDF or PS) and 10.12 (in PDF or PS). Table 10.6 (in PDF or PS) summarizes the γ-transitions from this and other reactions.

The E_p = 0.33 MeV resonance (¹⁰B* = 6.88 MeV) is ascribed to s-wave protons because of its comparatively large proton width [see ⁹Be(p, p)] and because of the isotropy of the γ-radiation. The strong transition to ¹⁰B*(1.74) requires E1 and hence J^π = 1^-; T = 0. T = 0 is also indicated by the large deuteron width. On the other hand, the strength of E1 transitions to ¹⁰B*(0.7, 2.1) indicates T = 1. The amplitudes for the T = 0 and T = 1 parts of the wave function for ¹⁰B*(6.88) are 0.92 and 0.39, respectively (1972RE07). See also (1969CO1G, 1969RO12, 1971AU1H).

The proton capture data near E_p = 1 MeV appears to require at least five resonant states, at E_p = 938, (980), 992, 1083 and 1290 keV. The narrow E_p = 1083 keV level (¹⁰B* = 7.56 MeV) is formed by p-wave protons, J^π = 0⁺ [see ⁹Be(p, p), ⁹Be(p, α)]. The isotropy of the gamma rays supports this assignment (1961TA02). The strong M1 transitions to J^π = 1⁺; T = 0 levels at 0.7, 2.16 and 5.18 MeV (Table 10.12 (in PDF or PS)) indicate T = 1 (1959WA16). See also (1970BO1Y).

The excitation function for ground-state radiation shows resonance at E_p = 992 (Γ = 80 keV) and 1290 keV (Γ = 230 keV) (1962EL06, 1964HO02). Elastic scattering studies indicate s-wave formation and J^π = 2^- for both (1956MO90). For the lower level (E_x = 7.48 MeV) the intensity of the g.s. capture radiation, Γ_γ = 25 eV (1964HO02) indicates E1 and T = 1. The angular distribution of γ-rays, 1 + 0.1sin²θ, is consistent with s-wave formation with some d-wave admixture (1953PA22) or with some contribution from a nearby p-wave resonance (1956MO90); possibly a J^π = 2⁺ level at E_p = 980 keV (1956MO90, 1962EL06: see, however, (1964HO02)).

The angular distribution of ground-state radiation at E_p = 1330 keV is isotropic and Γ_γ = 8.5 eV (1964HO02), supporting E1, T = 1 for this level (E_x = 7.75 MeV). See, however, (1973RO24): reaction 15.

Transitions to ¹⁰B*(0.7) [γ₁] show resonance at E_p = 992, 1290 and 938 keV, Γ=155 keV (1962EL06, 1964HO02). The latter is presumably also a resonance for (p, d) and (p, α). An assignment of J^π = 2^-; T = 0 is consistent with the data, although the E1 radiation then seems somewhat too strong for a ΔT = 0 transition (1964HO02). See also (1973RO24) in reaction 15.

A resonance for capture radiation at E_p = 2.567 ± 0.003 (E_x = 8.894 MeV) has a width of 40 ± 2 keV and decays mainly via ¹⁰B*(0.7) (1953MA1A). It appears from the width that this resonance corresponds to that observed in ⁹Be(p, α), J^π = 2⁺; T = 1 and not to the ⁹Be(p, n) resonance at the same energy (1956MA55). A further resonance is reported at E_p = 4.72 ± 0.01 MeV, Γ ≈ 0.5 MeV (1952HA10).

In the range E_p = 4 to 18 MeV, the γ₀ yield at 90° shows the resonance at E_p = 4.7 MeV (E_x = 10.7 MeV) and shows fluctuations suggesting states at E_x ≈ 14.6, 15.6 and 19.7 MeV. It is suggested that ¹⁰B*(19.7) decays via E1 and therefore J^π = 2^-, 3^-, 4^-. The other three states presumably decay by M1 and therefore J^π = 2⁺, 3⁺, 4⁺. These fluctuations appear on a nearly constant γ₀ yield with a 90° differential cross section ≈ 1.5 μb/sr. The average yield of γ₁ is ≈ 2/3 of the γ₀ yield. The broad giant resonance peak is centered at E_x ≈ 14.5 MeV. Fluctuations in the γ₁ yield are reported at E_x ≈ 12.6, 13.3 and 14.1 MeV. These states presumably decay by M1 to ¹⁰B*(0.7) [J^π_f = 1⁺] and therefore J^π_i = 0⁺, 1⁺, 2⁺. The weak γ₂ yield (to ¹⁰B*(1.74) [J^π = 0⁺; T = 1]) seems to exhibit a broad peak centered near E_x = 15 MeV (maximum 90° differential cross section ≈ 0.5 μb/sr) and possibly some structure near E_x = 20 MeV. The γ₃ yield (to ¹⁰B*(2.16) [J^π = 1⁺]) increases to ≈ 0.4 μb/sr at E_x ≈ 16 MeV and seems to remain constant beyond that energy, with some suggestion of a fluctuation corresponding to E_x ≈ 12.9 MeV. ¹⁰B*(12.9) appears to have positive parity. Angular distributions of γ₀, γ₁, γ₂ and γ₃ are also reported (1970FI1B; G.A. Fisher, private communication). See also (1969FI1C).

The magnetic moment of ¹⁰B*(0.72) has been studied via γ - γ correlations from ¹⁰B*(7.56): g = +0.63 ± 0.12 (1972AV01). For measurements of the mean life of ¹⁰B*(0.72), see Table 10.20 (in PDF or PS). See also (1965ZO1A, 1966ED1A) and (1966LA04, 1973SU1E).

14. ⁹Be(p, n)⁹B Q_m = -1.8498 E_b = 6.5853

Resonances in neutron yield occur at E_p = 2.56 and 4.7 MeV: see Table 10.13 (in PDF or PS). There is some indication of a broad maximum near E_p = 3.5 MeV; a peak reported at E_p = 4.9 MeV for n₁ neutrons may reflect the effect of this level (1959MA20). A sharp break at E_p = 6.55 ± 0.03 MeV is ascribed to a level in ⁹B at 4.04 MeV (1964BA16). See also (1972VO17).

The E_p = 2.56 MeV resonance is considerably broader than that observed at the same energy in ⁹Be(p, α) and ⁹Be(p, γ) and the two resonances are believed to be distinct (1956MA55). The shape of the resonance and the magnitude of the cross section can be accounted for with J^π = 3^- or 3⁺: the former assignment is in better accord with ¹⁰Be*(7.37). For J^π = 3^-, θ²_n = 0.135, θ²_p = 0.115 (R = 4.47 fm). The J^π = 2⁺ level should contribute about 10% to the cross section at E_p = 2.56 MeV (1962AL1A).

There are no resonances at threshold as had been reported by (1969SI20, 1970SI12): see (1970CO06). See also reaction 15.

For angular distributions see ⁹B. For polarization measurements see (1966LA04) and (1972SH1K). See also (1969VE02, 1970DA26, 1971JU05, 1973NE1G). For astrophysical considerations see (1969BA1N).

15. (a) ⁹Be(p, p)⁹Be E_b = 6.5853
(b) ⁹Be(p, pn)⁸Be Q_m = -1.6651

Elastic scattering has been studied for E_p = 0.2 to 2.7 MeV by (1956DE33, 1956MO90, 1969MO29, 1973RO24). Below E_p = 0.7 MeV only s-waves are present exhibiting resonance at E_p = 330 keV [¹⁰B*(6.88)], J^π = 1^-. Between E_p = 0.8 to 1.6 MeV polarization and cross-section measurements are well fitted by a phase-shift analysis, using only the ³S₁, ⁵S₂, ⁵P₁ and ⁵P₂ phases. Four levels satisfy the data, 1⁺ and 2^- states at E_x = 7.48 MeV, a sharp 0⁺ state at E_x = 7.56 MeV, and a 1^- state at 7.82 MeV: see Table 10.14 (in PDF or PS) (1956MO90, 1973RO24).

Pronounced minima at E_p = 2.48 and 2.55 are observed in the polarization (p₀): these are ascribed to T = 1 analogs of the 3^- and 2⁺ states ¹⁰Be*(7.37, 7.52) (1969AN27). A resonance corresponding to ¹⁰B*(8.89) is also reported by (1956DE33). The yield of p₀, p₁ and p₂ has been measured for E_p = 4.2 to 6.0 MeV by (1972YA06): structures are reported at E_p ≈ 4.7 MeV (Γ ≈ 0.3 MeV) in the p₂ yield and at E_p ≈ 5.1 MeV in the p₁ yield (1972YA06). Excitation curves for the p₀ group have been measured for E_p = 6.0 to 15.0 MeV (1972VO17, 1973VO02): a strong anomaly is observed at E_p = 6.7 MeV: see Table 10.14 (in PDF or PS). (1973VO02) find that the p₀ differential cross sections and polarization analyzing power are adequately described by a spherical optical model potential for E_p = 13 to 30 MeV: only the volume real potential depth V_R and the surface imaginary potential depth W_S need vary with energy. When coupled-channels analyses were made (1973VO02) found that a quadrupole-deformed optical model potential with a deformation β = 1.1 gives an improved description of the (p, p₀) data and good fits to data obtained for (p, p₂). See also (1971WE07).

The reports of anomalies in the yield of protons near the threshold for the (p, n) reaction, by (1968SI07, 1969SI20, 1970SI12), are in error: see (1970CO06, 1971GO33). See also (1965HU10, 1967CA1K, 1967MC1E, 1970BO1Y).

Cross section measurements have also been reported at E_p = 6.36 to 6.48 MeV (1971VA34; yield of p₁), 16.2 to 29.1 MeV (1973MO02; σ_R, and also σ for p₂ and p₃), 24.4 to 45.9 MeV (1969MC1A; σ_R), and 232 to 553 MeV (1972RE06; σ_R). See also (1966LA04) for the earlier work.

Polarization measurements involving the elastic group have been carried out at E_p = 0.9 to 2.7 MeV (1973RO24), 0.9 to 3.0 MeV (1969AN27), 2.2 to 3.8 MeV (1968BL1F), 3.0 to 12.0 MeV (1970LO03), 7.0, 8.5 and 10.0 MeV (1967KO1E; also p₂ at E_p = 11.0 MeV), 14.5 MeV (1965RO22), 17.8 MeV (1966BA59), 25 MeV (1973BI1H, 1973BI1N), 30.3 MeV (1967WA31), 42.0 MeV (1966CA01; p), 49.3 MeV (1970CL10; also p₂), 49.8 MeV (1971MA13, 1971MA44; also p₂), 138.2 and 145 MeV (1966JA08, 1966JA1F) and 990 MeV (1972VO20). Polarization measurements on the proton group to ⁹Be*(2.4) [p₂] have also been carried out at E_p = 8 to 10 MeV (1969BE1Q). See also (1966LA04).

For reaction (b) see (1967WA1H, 1972WA30). For spallation see (1970KO25). For astrophysical considerations see (1971EL1B). See also (1966RO1B, 1969CO1J, 1970SL1B) and (1967SA1C, 1969GU1K, 1969WA11, 1971BA87, 1971IN05, 1973GU08, 1973HU05; theor.).

16. ⁹Be(p, t)⁷Be Q_m = -12.0831 E_b = 6.5853

See ⁷Be.

17. (a) ⁹Be(p, d)⁸Be Q_m = 0.5595 E_b = 6.5853
(b) ⁹Be(p, α)⁶Li Q_m = 2.1251

Knowledge of the cross sections of these two reactions at low energies is of importance for power generation and astrophysical considerations: see (1973SI27). Absolute cross sections for the d₀ and α₀ groups have been measured for E_p = 28 to 697 keV with ± 5 - 6% uncertainty. The value of S_c.m. (E = 0) for the combined cross sections is estimated to be (35⁺⁴⁵_-15) MeV · b. At the 0.33 MeV resonance (J^π = 1^-), σ_α₀ = 360 ± 20 mb and σ_d₀ = 470 ± 30 mb. The data (including angular distributions), analyzed by an R-matrix compound nucleus model, were fitted by assuming three states at E_p(c.m.) = -20 keV (J^π = 2⁺; 3⁺ possible) [E_x = 6.57 MeV], 310 keV (1^-) and 410 keV (1⁺; 2⁺ or 3⁺ possible) (1973SI27). Measurements of the yields of d₀, α₀ and α₁ for E_p = 0.2 to 2.0 MeV have been reported by (1969TU1A): the total cross section is reported to show definite peaks at E_p = 0.330, 0.450, 0.935 and 1.80 MeV. The yields of α₀ and d₀ have also been measured for E_p = 0.3 to 0.9 MeV by (1968BE1N), and the yield of d₀ has been obtained at several angles for E_p = 6 to 15 MeV (1972VO1H). The total cross sections for d₀ and d₁ have been measured for E_p = 17.0, 21.0, 25.0 and 29.1 MeV (1973MO02). See also (1970BO1Y, 1971GU23). Polarization measurements have been made at E_p = 0.30 to 1.25 MeV (1971KE1D; d₀, α₀), 0.33 MeV (1967RO07; d₀), 1.6 to 3.8 MeV (1965DA05, 1968FR10; d₀), 3, 4 and 5 MeV (1966VE03; d₀), 4.91, 6.90, 8.27, 9.80 MeV (1967IV01; d₀), 5 to 12 MeV (1969LO1E; d₀), 13.0 and 15.0 MeV (1972VO1H; d₀) and 185 MeV (1968IN02, 1969IN1C; d to ⁸Be*(16.9, 19.2)). Previous studies are described in (1966LA04). Observed resonances are exhibited in Table 10.15 (in PDF or PS). Deuteron production has been studied for E_p = 1 to 3 GeV by (1969ED02). See also (1966MI1E, 1969CO1J), and (1969KO1P, 1971MC1H, 1971SA1J).

18. ⁹Be(d, n)¹⁰B Q_m = 4.3607

Neutron groups are observed corresponding to the ¹⁰B states listed in Table 10.16 (in PDF or PS). Thresholds for slow-neutron production corresponding to ¹⁰B states from 4.77 to 6.56 MeV are reported in Table 10.17 (in PDF or PS). Angular distributions have been measured at many energies: see (1959AJ76, 1966LA04) for earlier references and (1965BU10: E_d = 2.6 to 3.2, and 7 MeV; see Table 10.16 (in PDF or PS)), (1967FI01: E_d = 3.0, 3.5 and 5.5 MeV; see Table 10.16 (in PDF or PS)), (1967FU04: E_d = 5.5 MeV; n₀, n₂, n₃) and (1973PA14: E_d = 7.0, 12.0, 15.0, 16.0 MeV; E_x < 6.6 MeV). See also (1969RO14, 1971DE2C). The values of l_p and spectroscopic factors obtained in the analyses by (1965BU10, 1967FI01, 1973PA14) are shown in Table 10.16 (in PDF or PS). The spectroscopic factors measured for ¹⁰B*(1.74) (J^π = 0⁺; T = 1) are brought into accord with shell model predictions when the t-bar · T-bar interaction is considered (1967TA1A): see also (1966SI02, 1967FU04, 1973PA14).

There have been many reports of additional neutron groups [see (1959AJ76, 1966LA04)], in particular a state at 2.86 MeV. (1967GL03: E_d = 1.7 and 1.8 MeV) have shown that such a state does not exist: the intensity of a neutron group to such a state ≤ 0.4% relative to ¹⁰B*(3.59) and ≤ 0.3% relative to ¹⁰B*(2.16). See also (1965MA50).

Observed γ-transitions are listed in Tables 10.6 (in PDF or PS) and 10.18 (in PDF or PS) (1949RA02, 1963WA17, 1964WA05, 1969GA06). Reported values of τ_m for a number of ¹⁰B states are displayed in Table 10.9 (in PDF or PS) (1966WA10, 1968FI09, 1969AL17).

From all the various experiments the following picture emerges: the first five states of ¹⁰B have even parity [from l_p]. The ground state is known to have J = 3, by direct measurement, and ¹⁰B*(1.74) has J^π = 0⁺ and is the T = 1 analogue of the ¹⁰C_g.s. [from the β⁺ decay of ¹⁰C]. Then looking at the branching ratios and lifetimes of the other states, the sequence for ¹⁰B*(0, 0.72, 1.74, 2.16, 3.59) is J^π = 3⁺, 1⁺, 0⁺, 1⁺, 2⁺, respectively [see discussion in (1966LA04, 1966WA10)].

See also ¹¹B and (1965FO1C, 1966FI01, 1970SR01, 1970WI1C, 1972SR04, 1972SR02, 1973WE1T, 1973WE19), (1966WA1C, 1967LE1F) and (1970FO1B, 1970MI1G, 1973CO16; theor.).

19. ⁹Be(³He, d)¹⁰B Q_m = 1.0916

Deuteron groups have been seen corresponding to a number of states of ¹⁰B: see Table 10.19 (in PDF or PS) (1960HI08, 1966FO08, 1966SI02, 1967CR04). See also (1970CA28). No evidence is seen for previously reported states at E_x = 5.58 and 6.40 MeV (1966FO08). Angular distributions obtained at E_d = 10 MeV (1967CR04), 10.2 MeV (1960HI08), 17 MeV (1966SI02) [see also (1973PA14)], 22 MeV (1969MA1R) and 25 MeV (1960WE04, 1967SI1A) have been analyzed by DWBA and lead to the l_p and the spectroscopic factors shown in Table 10.19 (in PDF or PS). See also (1971BI1D), (1967LE1F) and (1968TA1A, 1971DZ07, 1973CO16; theor.). For τ_m measurements see Table 10.9 (in PDF or PS) (1966FI01, 1968FI09).

20. ⁹Be(α, t)¹⁰B Q_m = -13.229

Angular distributions have been obtained at E_α = 27 MeV (1973KE1E; t₀, t₁, t₃), 28.3 MeV (1965KA14; t₀, t₁) and E_α = 43 MeV (1967DE1K, 1967SI1A; t₀, t₂). At E_α = 27 MeV, ¹⁰B*(1.7) is not observed (1973KE1E). See also (1966LA04).

21. ⁹Be(¹⁴N, ¹³C)¹⁰B Q_m = -0.9654

See ¹³C in (1970AJ04, 1976AJ04)

22. ¹⁰Be(β^-)¹⁰B Q_m = 0.5559

See ¹⁰Be.

23. (a) ¹⁰B(γ, n)⁹B Q_m = -8.435
(b) ¹⁰B(γ, p)⁹Be Q_m = -6.5853
(c) ¹⁰B(γ, d)⁸Be Q_m = -6.0258
(d) ¹⁰B(γ, α)⁶Li Q_m = -4.460

Absolute measurements have been made of the ¹⁰B(γ, all n) cross section from threshold to 28 MeV: the giant resonance is broad with the major structure contained in two peaks at E_x = 20.1 ± 0.1 and 23.1 ± 0.1 MeV (σ ≈ 6.5 mb) (1973HU09, 1973HU1D). The integrated cross section to 29 MeV is 66.7 MeV · mb (1965HA19). See also (1964GR40) and (1973AR1L). Using 12.5 MeV bremsstrahlung (1968SH21) report peaks in the (γ, p) cross section corresponding to ¹⁰B states at 8.8 ± 0.1 [J^π = 2⁺], 9.2 ± 0.1 [3⁺] and (≈ 10.5) [π = +] MeV, with T = 1. See (1959AJ76, 1966LA04) for reactions (c) and (d).

24. ¹⁰B(γ, γ)¹⁰B

See (1967LO1B).

25. ¹⁰B(e, e)¹⁰B

The quadrupole contribution to the elastic form factor is best accounted for by the undeformed shell model, Q = 7.45 (± 20%) fm², < r² >^1/2 = 2.45 fm (1966ST12). The magnetic form factors for E_e = 70 to 200 MeV have been determined for the elastic group (+ a small contribution due to ¹⁰B*(0.7)): there is no evidence of an M3 contribution - the magnetic octupole moment ≲ 1.6 fm², a₀ = 1.4 ± 0.2 fm (1966RA29). At E_e = 29.2 to 57.8 MeV (1966SP02) has studied the inelastic groups corresponding to E_x = 6.014 ± 0.020 (J^π = 4⁺, E2) and 7.477 ± 0.020 MeV (J^π = 2⁺, M1)^†: Γ_γ₀ = 0.122 ± 0.020 eV and 12.0 ± 2.2 eV^†^†, and Γ_γ₀/Γ_w = 14 and 1.4, respectively. Γ_tot ≈ 40 keV for ¹⁰B*(7.48) (1966SP02). A number of other inelastically scattered electron groups are reported by (1966KO08) at E_e = 50 MeV: Γ_γ₀ values are given (± 50%). See also (1965FR07, 1965VA1G).

^† See, however, Table 10.11 (in PDF or PS).

^†^† Reanalysis of the data, including Coulomb distortion effects, leads to Γ_γ₀ = 11.0 ± 2.2 eV (1969CH1A) for ¹⁰B*(7.48). See also (1972THZF).

See also (1966PE1E), (1966IS1A, 1967LE1E, 1968GO1J) and (1967KA1A, 1969UB1B, 1969VI02, 1970LA13; theor.).

26. ¹⁰B(n, n)¹⁰B

Elastic angular distributions have been measured for E_n = 1.5 to 5.0 MeV by (1970PO1E, 1973NE1H). At higher energies in addition to the elastic group (not resolved from the group to ¹⁰B*(0.7)), angular distributions have been obtained for the neutrons to ¹⁰B*(1.74 ± 2.16, 3.59, 4.77, unresolved states near 5.0, 6.0, 6.6): see (1969HO1G: E_n = 7.02 and 7.55 MeV), (1970CO12: E_n = 9.72 MeV) and (1968AL1E, 1970VA19: E_n = 14.1 MeV). The gamma decay of ¹⁰B states with E_n < 6.1 MeV has been studied by (1970NE03). See also (1969HA1R), (1966LA04) and ¹¹B in (1975AJ02).

27. ¹⁰B(p, p')¹⁰B

Angular distributions of elastically scattered protons have been measured at E_p = 3.0 to 10.5 MeV (1970BO17), 5.1 to 16.5 MeV (1968WA1H, 1969WA23), 33.6 MeV (1970KU1D) and 49.5 MeV (1970SQ01). Observed inelastic groups are displayed in Table 10.20 (in PDF or PS) (1953BO70, 1962AR02, 1964AR04). Angular distributions for the proton groups to the first five excited states and to ¹⁰B*(6.04) have been measured in the range E_p = 5.1 to 16.5 MeV (1968WA1H, 1969WA23). See also (1966LA04). The 4⁺ state at 6.03 MeV is the most strongly excited of the ¹⁰B states: see (1962SC12, 1965HA17, 1969DE1N, 1969WA23): B(E2↑) = 26 ± 5 fm⁴ and Γ(E2↓) = 0.14 eV (1965JA1A). For optical model parameters see (1969WA11, 1970SQ01).

Gamma rays have been observed with E_γ = 718.5 ± 0.2 keV and 1021.5 ± 0.5 keV (1966FR09: from decay of E_x = 718.5 ± 0.2 and 1740.0 ± 0.6 keV) and E_γ = 720.1 ± 2.0, 1022.0 ± 2.0, 1435.1, 2155.6 ± 2.0 and 2868.5 ± 2.0 keV (1969PA09: from decay of E_x = 720.4 ± 1.9, 1742.3 ± 2.3, 2155.4 ± 1.9 and 3589.7 ± 2.2 keV). See also reaction 39. (1968MA18) report δ(E2/M1) = -(0.23^+0.06_-0.05) or -(4.1^+1.0_-0.7) for the 2.15 → 0.72 transition. The 1.74 → g.s. and 3.59 → 1.74 transitions have not been observed: < 0.2% and < 0.3%, respectively (1966SE03). The branching ratio for 5.17 → 1.74 is < 0.5% and 5.17 → 3.59 is (4.5 ± 1)% [see Table 10.6 (in PDF or PS)] (1967PA01). See Table 10.9 (in PDF or PS) for other τ_m measurements (1966FI01, 1968FI09). See also (1971SC1N) and (1969TI02, 1973HU05, 1973KA04, 1973ZW1A; theor.). See also ¹¹C in (1975AJ02).

28. (a) ¹⁰B(p, 2p)⁹Be Q_m = -6.5853
(b) ¹⁰B(p, pn)⁹B Q_m = -8.435
(c) ¹⁰B(p, pα)⁶Li Q_m = -4.460

The summed proton spectrum (reaction (a)), observed at E_p = 460 MeV, shows peaks corresponding to the removal of an l ≠ 0 proton at Q = -6.7 ± 0.5, -11.9 ± 0.5 and -17.1 ± 0.6 MeV; for removal of an l = 0 proton, Q = -30.5 ± 0.6 MeV (1966TY01). See also (1966JA1A, 1967JA1E, 1968JA1G, 1969KO1J; theor.) and (1966LA04). For reaction (b) see (1970TH1F) and for reaction (c) see (1971GA1J).

29. ¹⁰B(d, d')¹⁰B*

Deuteron groups have been observed corresponding to twelve states of ¹⁰B: see Table 10.20 (in PDF or PS) (1953BO70, 1962AR02, 1964AR04, 1972ST1M). The very low intensity of the group to ¹⁰B*(1.74) (1972ST1M) and the absence of the group to ¹⁰B*(5.17) (1962AR02) is good evidence of their T = 1 character. Angular distributions have been reported at E_d = 4, 6 and 8 MeV (1965LE1B, 1967DI01; d₀), 7.0 and 9.0 MeV (1972ST1M; d₂ and d₃), 11.8 MeV (1967FI07; d₀, d₁. d₃, d₄, d₅, d₆ and d to unresolved 6 MeV states) and 28 MeV (1968GA13, 1968ME1E; d₀; see for optical parameters). See also (1966BR1G), (1968NE1A, 1969NE08; theor.) and ¹²C in (1975AJ02).

30. ¹⁰B(t, t)¹⁰B

Angular distributions of elastically scattered tritons have been measured at E_t = 1.5 MeV (1963HO19, 1969HE08) and 2.5, 2.7, 3.1 and 3.3 MeV (1971GE09).

31. ¹⁰B(³He, ³He)¹⁰B

Angular distributions of elastically scattered ³He have been measured at E(³He) = 4, 8, 10, 12, 15 and 18 MeV (1970DU07), 9.8 MeV (1967PA1H), 13.2, 17.2 and 24.3 MeV (1972BU30), 14 MeV (1970NU02) and 32.5 MeV (1968SQ01). See also (1970BA1P). For derived optical model parameters see (1968SQ01, 1970DU07, 1970NU02, 1972BU30). Angular distributions have also been measured at E(³He) = 32.5 MeV to ¹⁰B*(0.72, 1.74, 2.16, 3.59, 4.77, 5.11 + 5.17 + 5.18, 6.03, 6.56). L = 2 gives a good fit to the distributions of ³He ions to ¹⁰B*(0.72, 2.16, 3.59, 6.03): derived β_L are shown in Table 10.20 (in PDF or PS) (1968SQ01). See also (1967CO1J, 1970BA1P) and (1968HO1C).

32. (a) ¹⁰B(α, α')¹⁰B*
(b) ¹⁰B(α, 2α)⁶Li Q_m = -4.460

Angular distributions of elastically scatted α-particles have been measured at E_α = 5 to 30 MeV (1972DA04) and at 56 MeV (1969GA11). For optical model parameters see (1970ZE03, 1972DA04). Inelastic α-groups are also reported to ¹⁰B*(0.72, 2.16, 3.59, 4.77, 5.11 + 5.17 + 5.18, 5.92 + 6.03, 6.13, 6.56) (1972DA04). ¹⁰B*(1.74) is not seen (1967CO1P, 1972DA04).

At E_α = 24 MeV, analysis of the angular distributions of the α-particles emitted in the decay of ¹⁰B*(4.77, 5.92) suggests 4⁺ for the former (see, however, Table 10.5 (in PDF or PS)) and 2⁺ for the latter (1973EI03). See also (1966GE12, 1971GA1J, 1974DO1G) and (1969GA01) in ¹⁴N in (1970AJ04).

33. (a) ¹⁰B(⁶Li, ⁶Li)¹⁰B
(b) ¹⁰B(⁷Li, ⁷Li)¹⁰B

For reaction (a) see (1970BO1W). The elastic scattering in reaction (b) has been studied at E(⁷Li) = 24 MeV (1972WE08). See also (1969RO1G; theor.).

34. ¹⁰B(¹⁰B, ¹⁰B)¹⁰B

See (1967BE1T).

35. ¹⁰B(¹²C, ¹²C)¹⁰B

The elastic scattering angular distribution has been measured at E(¹⁰B) = 18 MeV (1968VO1A, 1969VO10).

36. ¹⁰B(¹⁴N, ¹⁴N)¹⁰B

See (1970IS1A).

37. (a) ¹⁰B(¹⁶O, ¹⁶O)¹⁰B
(b) ¹⁰B(¹⁸O, ¹⁸O)¹⁰B

The elastic scattering in reaction (a) has been studied with E(¹⁶O) = 15.0 to 32.5 MeV: see (1968OK06, 1968OK1B, 1969KR03); that in reaction (b) has been studied for E(¹⁸O) = 20, 24 and 30.5 MeV (1971KN05). See also (1970BL1E).

38. ¹⁰B(¹⁹F, ¹⁹F)¹⁰B

The elastic scattering has been studied for E(¹⁹F) = 20 and 24 MeV (1971KN05).

39. ¹⁰C(β⁺)¹⁰B Q_m = 3.650

The half-life is 19.48 ± 0.05 sec (1962EA02), 19.27 ± 0.08 sec (1963BA52): the weighted mean is 19.42 ± 0.06 sec^†. The decay is to ¹⁰B*(0.7, 1.7): see Table 10.21 (in PDF or PS) for branching ratios and log ft (1969BR13, 1972GO1A, 1972RO03). The vector coupling constant determined from the decay to the analog state ¹⁰B*(1.7) is G^V_β = (1.396 ± 0.009) × 10^-49 erg · cm³ (1972RO03). See also (1972FR1L). The excitation energies of ¹⁰B*(0.7, 1.7) are E_x = 718.32 ± 0.09 and 1740.16 ± 0.17 keV [E_γ = 718.29 ± 0.09 and 1021.78 ± 0.14 keV] (1969FR02). See also (1966FR09). See also (1967MU1A, 1969FR09) and (1965CO25, 1966BA1A, 1968BO1U, 1968MO1F, 1969BL1E, 1969BL1D, 1969KA1B, 1970DA21, 1972BE04, 1972WI1C, 1973HA49, 1973TO04, 1973WI11; theor.).

^† See also Table 10.24 (in PDF or PS).

40. ¹¹B(γ, n)¹⁰B Q_m = -11.4560

The intensities of the transitions to ¹⁰B*(3.59, 5.17) [T = 0 and 1, respectively] depend on the region of the giant dipole resonance in ¹¹B from which the decay takes place: it is suggested that the lower energy region consists mainly of T = 1/2 states and the higher energy region of T = 3/2 states (1971PA10). See also reaction 22 in ¹⁰Be, and ¹¹B in (1975AJ02). See also (1969MU10).

41. ¹¹B(p, d)¹⁰B Q_m = -9.2314

Angular distributions of deuteron groups have been measured at E_p = 19 MeV (1963LE03; d₀, d₁, d₂, d₃, d₄), 33.6 MeV (1968KU04, 1970KU1D; d₀, d₁, d₂, d₃, d₄, d₅ and deuterons to states at 5.18 (unres.), 6.04 (unres.)) and 154.8 MeV (1969BA05, 1969TO1A; d₀, d₁, d₂, d₃, d₄ and d to 5.1 ± 0.1, 11.4 ± 0.2 and 14.1 ± 0.2 MeV). The weak excitation of states at 6.56 and 7.5 MeV is also reported (1968KU04), and Γ_c.m. of ¹⁰B*(11.4) = 1.1 ± 0.2 MeV (1969BA05). Spectroscopic factors have been extracted by [(1963LE03): PWBA; (1968KU04): DWBA; (1969BA05) and (1969TO1A): DWBA].

42. ¹¹B(d, t)¹⁰B Q_m = -5.1984

Angular distributions have been measured at E_d = 11.8 MeV (1967FI07; t₀, t₁, t₂, t₃; l = 1; S = 1.88, 0.94, 1.35, 1.35, respectively) and at E_d = 21.6 MeV (1967DE1M; t₀ → t₅ and t to ¹⁰B*(5.1); S_rel extracted). A dependence of the angular distribution on the isospin of the final state is discussed by (1967FU04).

43. (a) ¹¹B(³He, α)¹⁰B Q_m = 9.1225
(b) ¹¹B(³He, 2α)⁶Li Q_m = 4.662

Reported levels are listed in Table 10.22 (in PDF or PS) (1965GO05, 1967PU04). See also (1966LA04). Angular distributions have been measured at E(³He) = 1.0, 1.8, 2.15 MeV (1966LO15; α₀ → α₃), 8, 10, 12 MeV (1973CO19; α₀) and 33 MeV (1969DE10: see Table 10.22 (in PDF or PS)). See also the earlier work of (1960TA12, 1965FO06). The decays of many of the states have been studied by (1966AL06, 1968WA15, 1969YO01): see Table 10.6 (in PDF or PS). Lifetime measurements are summarized in Table 10.9 (in PDF or PS) (1968DO01, 1969JA1N).

Alpha - α angular correlations (reaction (b)) have been measured for the transitions via ¹⁰B*(5.92, 6.03, 6.13, 6.56, 7.00). The results are consistent with J^π = 2⁺ and 4⁺ for ¹⁰B*(5.92, 6.03) and require J^π = 3^- for ¹⁰B*(6.13). There is substantial interference between levels of opposite parity for the α-particles due to ¹⁰B*(6.56, 7.00): the data are fitted by J^π = 3⁺ for ¹⁰B*(7.00) and (3, 4)^- for ¹⁰B*(6.56) [the ⁶Li(α, α) results then require J^π = 4^-] (1971YO05). See, however, (1973SI27) in reaction 17. See also (1970LI1K).

44. ¹¹B(¹⁶O, ¹⁷O)¹⁰B Q_m = -7.314

See (1968OK06) and (1969BR1D).

45. ¹²C(γ, d)¹⁰B Q_m = -25.1885

See (1972SK08).

46. ¹²C(n, t)¹⁰B Q_m = -18.9309

Not reported.

47. (a) ¹²C(p, ³He)¹⁰B Q_m = -19.6948
(b) ¹²C(p, pd)¹⁰B Q_m = -25.1885

Angular distributions of ³He ions have been measured at E_p = 39.8 MeV (1973HO10: to ¹⁰B*(0, 0.72, 1.74, 2.16, 3.59)) and 185 MeV (1968TI1A, 1972DA26: to ¹⁰B*(0, 1.0, 1.7, 2.5, 3.5, 4.8, 6.0, 7.3)). See also (1966KI07) and (1968SA1H, 1971BA61; theor.). For reaction (b) see (1972BO17), (1968PA1J) and (1966LH1A, 1971BA16; theor.).

48. ¹²C(d, α)¹⁰B Q_m = -1.3409

Alpha groups have been observed to the known states of ¹⁰B below E_x = 7.1 MeV: see Table 10.23 (in PDF or PS) (1962AR02, 1965PE17, 1970AN1J). Angular distributions have been determined for α₀, α₁, α₃ and α₄ at 9.2 to 13.9 MeV (1965BA06, 1966BA32, 1968KL06), 11.4 and 12.4 MeV (1965DO08), 12 MeV (1970AN1J), 13 MeV (1965ME13), 14.7 to 19.7 MeV (1961YA08, 1963YA1B) and 24 MeV (1965PE17). Angular distributions have also been measured at E_d = 5.00 to 8.40 MeV (1969CO02; α₀, α₁), 6.2 to 6.8 MeV (1965NE10; α₀, α₁), 12 MeV (1970AN1J; α to ¹⁰B*(4.77, 5.11, 5.17, 5.92, 6.03, 6.13, 6.56), 24 MeV (1965PE17; α to ¹⁰B*(4.77, 5.17, 6.03)). See also (1969CU08).

The population of the isospin-forbidden group to ¹⁰B*(1.74) [α₂] has been studied with E_d up to 30 MeV. For E_d ≲ 15 MeV the reaction appears to proceed via compound nucleus formation [see ¹⁴N]; at the higher energies direct interaction mechanism may be involved: see (1966LA04) and (1966ME09, 1968JA09, 1969SM03, 1971JA04, 1971RI15, 1971VO04). See also (1966HA09). Angular distributions of the α₂ group have been reported at E_d = 7.0 to 14.0 MeV (1969SM03, 1971RI15), 9.0 to 12.5 MeV (1966ME09), 14.0 to 17.0 MeV (1971VO04), 14.8, 18.0, 21.0, 29.1 MeV (1968JA09, 1971JA04).

See also (1966PA1J, 1967BR1B, 1969DE29), (1966BR1G, 1969SC1F) and (1966DR1C, 1966GR1G, 1966HO1D, 1966ME1E, 1966WA1G, 1967NO1A, 1968NO1C, 1968ZE1B, 1969NO1B, 1969NO1C, 1971BA61; theor.).

49. ¹²C(α, ⁶Li)¹⁰B Q_m = -23.715

At E_α = 42 MeV angular distributions have been measured for the transitions to ⁶Li_g.s. + ¹⁰B_g.s., ⁶Li_g.s. + ¹⁰B^*_0.72, (⁶Li^*_2.19 + ¹⁰B_g.s.) + (⁶Li_g.s. + ¹⁰B^*_2.15), ⁶Li_g.s. + ¹⁰B^*_2.15, ⁶Li^*_2.19 + ¹⁰B^*_0.72 (1972RU03). See also ¹⁶O in (1977AJ02).

50. ¹²C(¹⁰B, 3α)¹⁰B Q_m = -7.2748

See (1965SH1A, 1967BI1F).

51. (a) ¹²C(¹¹B, ¹³C)¹⁰B Q_m = -6.5096
(b) ¹²C(¹⁴N, ¹⁶O)¹⁰B Q_m = -4.4518

See (1969BR1D, 1972MO1E, 1973SC1J).

52. ¹³C(p, α)¹⁰B Q_m = -4.0627

Angular distributions have been measured at E_p = 43.7 and 50.5 MeV for the α-particle groups to ¹⁰B*(1.74) [L = 1] and ¹⁰B*(6.03) [L = 3] (1972MA21).

53. ¹³C(¹¹B, ¹⁴C)¹⁰B Q_m = -3.2790

See (1969BR1D, 1972MO1E, 1973SC1J).

54. (a) ¹⁴N(γ, α)¹⁰B Q_m = -11.6134
(b) ¹⁴N(p, αp)¹⁰B Q_m = -11.6134

For reaction (a) see (1959AJ76); for reaction (b) see (1961CL09).

55. ¹⁴N(d, ⁶Li)¹⁰B Q_m = -10.140

See (1970MC1G).

56. ¹⁴N(³He, ⁷Be)¹⁰B Q_m = -10.027

At E(³He) = 41 MeV, the population of ¹⁰B*(0, 0.72, 2.16, 3.59, 6.1) has been observed. The transition to ¹⁰B*(1.74) [T = 1] is very weak (1971DE37).

57. ¹⁵N(¹¹B, ¹⁶N)¹⁰B Q_m = -8.966

See (1969BR1D).

58. ¹⁶O(p, ⁷Be)¹⁰B Q_m = -20.533

See (1969HO1H).