
^{10}B (1974AJ01)(See Energy Level Diagrams for ^{10}B) 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 αparticle 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 γdeexcitation of ^{10}B*(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). Groundstate properties: (1965CO25, 1966MA1P, 1966WI1E, 1967BA78, 1967SH05, 1967SH14, 1968PE16, 1969LE1B, 1969VA1C, 1969WU1A, 1970HI08, 1971TA1A, 1972LE1L, 1972VA36, 1973CO1P, 1973MA1K, 1973SA30, 1973SU1B).
μ = +1.8007 nm (1969FU11, 1971SH26); Q = +0.08 b (1969FU11); [+0.0847 ± 0.0006 b (1970NE05); theor.]; see also (1968SC18).
Six resonances are observed in the range E_{α} = 0.5 to 3.8 MeV, corresponding to ^{10}B*(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 ^{10}B*(6.13) may also be present (1966FO05). Angular distribution and branching ratio measurements are consistent with 3^{+} for ^{10}B*(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).
The excitation functions for neutrons (1963ME08: from threshold to E_{α} = 15.5 MeV) and for d_{0} particles (1963BL20: E_{α} = 9.5 to 11.4 MeV) do not show resonance structure. See also ^{8}Be, ^{9}Be and ^{9}B.
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 ^{10}B*(5.18) supports the proposal by (1961TR1B) that it is a member of the doublet formed by twonucleon excitation into the 2s shell, whose other member is the J^{π} = 0^{+}; T = 1 state at 7.56 MeV. Excitation functions of α_{0} 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 highenergy 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 ^{10}B*(14.0) (1970BI1B, 1971BI12). Excitation functions for α_{0} and α_{1} [to ^{6}Li*(2.19)] at E_{α} = 9.5 to 12.5 MeV do not show resonance structure (1963BL20). See also (1969TR1B, 1972RI10; theor.).
Angular distributions of deuteron groups have been determined at E(^{6}Li) = 2.4 to 9.0 MeV (d_{0}, d_{1}, d_{3}) and 7.35 and 9.0 MeV (d_{4}, d_{5}) (1966KI09). The d_{2} 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 ^{12}C in (1975AJ02).
Angular distributions of the t_{0} and t_{1} groups have been measured at E(^{6}Li) = 3.3 MeV (1967GA06) and E(^{7}Li) = 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 ^{13}C in (1976AJ04).
Capture γrays have been observed for E(^{3}He) = 0.8 to 3.0 MeV (1965PA02, 1971LI20) and 3.0 to 6.0 MeV (1968LI03). The γ_{0} and γ_{5} yields [to ^{10}B*(0, 4.77)] show resonances at E(^{3}He) = 1.1 and 2.2 MeV [E_{res} = 0.92 and 2.1 MeV: see (1971LI20)], the γ_{1} and γ_{4} yields [to ^{10}B*(0.72, 3.59)] at 1.4 MeV and the γ_{4} 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 [^{10}B*(18.4, 19.3)] appear to result from swave capture; the subsequent decay is to two 3^{+} states [^{10}B*(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 α_{2} to ^{6}Li*(3.56) which has J^{π} = 0^{+}; T = 1: see reaction 11] (1965PA02, 1971LI20). The assignment for ^{10}B*(18.8) [1.4 MeV resonance] is 1^{+} or 2^{+} but there appears to be α_{2} decay and therefore J^{π} = 2^{+}. ^{10}B*(20.2) [3.4 MeV resonance] has an isotropic angular distribution of γ_{4} and therefore J^{π} = 0^{+}, 1^{}, 2^{}. The γ_{2} 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).
The excitation curve is smooth up to E(^{3}He) = 1.8 MeV (1962SE1A, 1963DU12, 1966DI04) and the n_{0} yield shows resonance behavior at E(^{3}He) = 2.2 and 3.25 MeV, Γ_{lab} = 270 ± 30 and 500 ± 100 keV. No other resonances are observed up to E(^{3}He) = 5.5 MeV (1966DI04). See also Table 10.10 (in PDF or PS).
The yield of p_{0} and p_{2} has been measured for E(^{3}He) = 0.60 to 1.25 MeV (1971ST35): it is suggested that ^{10}B*(18.4) is formed. The yield of protons is relatively flat for E(^{3}He) = 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 γrays from the decay of the T = 3/2 state of ^{9}Be at 14.39 MeV to ^{9}Be*(0, 2.4) has been studied at E(^{3}He) = 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).
Yields of tritons have been measured for E(^{3}He) = 0.65 to 1.25 MeV (1971ST35; d_{0}), 2.0 to 4.2 MeV (1969OR01; t_{0}), 8.0 to 10.0 MeV (1968MA1W; t_{0}, t_{1}) and 10 to 16 MeV (1969NU1A; t_{0}, t_{1}). A broad peak is reported at E(^{3}He) ≈ 3.5 MeV (1969OR01). For reaction (a) see ^{8}Be.
Excitation functions have been measured at E(^{3}He) = 1.3 to 5.4 MeV (1965FO07; α_{0}, α_{1}, α_{2}), 2.0 to 4.2 MeV (1969OR01; α_{0}), 2.5 to 4.2 MeV (1969OR01; α_{2}), 5.0 to 8.0 MeV (1970OR03; α_{0}, α_{1}, α_{2}) and 16.0 to 18.0 MeV (1971ZA07; α_{0}). The α_{0} 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(^{3}He) = 4.5 and 5.5 MeV. Integrated α_{0} and α_{1} yields rise monotonically to 4 MeV and then tend to decrease (1965FO07). Angular distributions give evidence of the resonances at E(^{3}He) = 1.4 and 2.1 MeV seen in ^{7}Li(^{3}He, γ)^{10}B: J^{π} = 2^{+} or 1^{}; T = (1) for both [see, however, reaction 7]: Γ_{α} is small (1965PA03). The α_{2} yield [to ^{6}Li*(3.56), J^{π} = 0^{+}; T = 1] shows some structure at E(^{3}He) = 1.4 MeV and a broad maximum at ≈ 3.3 MeV (1965FO07, 1969OR01): see Table 10.10 (in PDF or PS).
Angular distributions have been measured for the n_{0} group at E_{α} = 4.78 to 7.85 MeV (1972VA02) and 13.5 and 13.9 MeV (1962KJ05), and for the n_{1} group [to ^{10}B*(0.7)] at E_{α} = 6.71 to 7.85 MeV (1972VA02). The n_{2} group has also been seen in this reaction (1972VA02). Slowneutron threshold measurements have been reported corresponding to the formation of ^{10}B*(0, 0.72, (4.77), (6.42)): see (1957BI84, 1963ME08) and (1966LA04). The lifetime of ^{10}B*(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 γdecay of ^{10}B*(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).
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 γtransitions from this and other reactions. The E_{p} = 0.33 MeV resonance (^{10}B* = 6.88 MeV) is ascribed to swave protons because of its comparatively large proton width [see ^{9}Be(p, p)] and because of the isotropy of the γradiation. The strong transition to ^{10}B*(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 ^{10}B*(0.7, 2.1) indicates T = 1. The amplitudes for the T = 0 and T = 1 parts of the wave function for ^{10}B*(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 (^{10}B* = 7.56 MeV) is formed by pwave protons, J^{π} = 0^{+} [see ^{9}Be(p, p), ^{9}Be(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 groundstate radiation shows resonance at E_{p} = 992 (Γ = 80 keV) and 1290 keV (Γ = 230 keV) (1962EL06, 1964HO02). Elastic scattering studies indicate swave 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 γrays, 1 + 0.1sin^{2}θ, is consistent with swave formation with some dwave admixture (1953PA22) or with some contribution from a nearby pwave resonance (1956MO90); possibly a J^{π} = 2^{+} level at E_{p} = 980 keV (1956MO90, 1962EL06: see, however, (1964HO02)). The angular distribution of groundstate 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 ^{10}B*(0.7) [γ_{1}] 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 ^{10}B*(0.7) (1953MA1A). It appears from the width that this resonance corresponds to that observed in ^{9}Be(p, α), J^{π} = 2^{+}; T = 1 and not to the ^{9}Be(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 γ_{0} 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 ^{10}B*(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 γ_{0} yield with a 90° differential cross section ≈ 1.5 μb/sr. The average yield of γ_{1} is ≈ 2/3 of the γ_{0} yield. The broad giant resonance peak is centered at E_{x} ≈ 14.5 MeV. Fluctuations in the γ_{1} yield are reported at E_{x} ≈ 12.6, 13.3 and 14.1 MeV. These states presumably decay by M1 to ^{10}B*(0.7) [J^{π}_{f} = 1^{+}] and therefore J^{π}_{i} = 0^{+}, 1^{+}, 2^{+}. The weak γ_{2} yield (to ^{10}B*(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 γ_{3} yield (to ^{10}B*(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. ^{10}B*(12.9) appears to have positive parity. Angular distributions of γ_{0}, γ_{1}, γ_{2} and γ_{3} are also reported (1970FI1B; G.A. Fisher, private communication). See also (1969FI1C). The magnetic moment of ^{10}B*(0.72) has been studied via γ  γ correlations from ^{10}B*(7.56): g = +0.63 ± 0.12 (1972AV01). For measurements of the mean life of ^{10}B*(0.72), see Table 10.20 (in PDF or PS). See also (1965ZO1A, 1966ED1A) and (1966LA04, 1973SU1E).
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 n_{1} 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 ^{9}B 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 ^{9}Be(p, α) and ^{9}Be(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 ^{10}Be*(7.37). For J^{π} = 3^{}, θ^{2}_{n} = 0.135, θ^{2}_{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 ^{9}B. For polarization measurements see (1966LA04) and (1972SH1K). See also (1969VE02, 1970DA26, 1971JU05, 1973NE1G). For astrophysical considerations see (1969BA1N).
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 swaves are present exhibiting resonance at E_{p} = 330 keV [^{10}B*(6.88)], J^{π} = 1^{}. Between E_{p} = 0.8 to 1.6 MeV polarization and crosssection measurements are well fitted by a phaseshift analysis, using only the ^{3}S_{1}, ^{5}S_{2}, ^{5}P_{1} and ^{5}P_{2} 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 (p_{0}): these are ascribed to T = 1 analogs of the 3^{} and 2^{+} states ^{10}Be*(7.37, 7.52) (1969AN27). A resonance corresponding to ^{10}B*(8.89) is also reported by (1956DE33). The yield of p_{0}, p_{1} and p_{2} 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 p_{2} yield and at E_{p} ≈ 5.1 MeV in the p_{1} yield (1972YA06). Excitation curves for the p_{0} 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 p_{0} 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 coupledchannels analyses were made (1973VO02) found that a quadrupoledeformed optical model potential with a deformation β = 1.1 gives an improved description of the (p, p_{0}) data and good fits to data obtained for (p, p_{2}). 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 p_{1}), 16.2 to 29.1 MeV (1973MO02; σ_{R}, and also σ for p_{2} and p_{3}), 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 p_{2} 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 p_{2}), 49.8 MeV (1971MA13, 1971MA44; also p_{2}), 138.2 and 145 MeV (1966JA08, 1966JA1F) and 990 MeV (1972VO20). Polarization measurements on the proton group to ^{9}Be*(2.4) [p_{2}] 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.).
See ^{7}Be.
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 d_{0} and α_{0} 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 Rmatrix 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 d_{0}, α_{0} and α_{1} 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 α_{0} and d_{0} have also been measured for E_{p} = 0.3 to 0.9 MeV by (1968BE1N), and the yield of d_{0} has been obtained at several angles for E_{p} = 6 to 15 MeV (1972VO1H). The total cross sections for d_{0} and d_{1} 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; d_{0}, α_{0}), 0.33 MeV (1967RO07; d_{0}), 1.6 to 3.8 MeV (1965DA05, 1968FR10; d_{0}), 3, 4 and 5 MeV (1966VE03; d_{0}), 4.91, 6.90, 8.27, 9.80 MeV (1967IV01; d_{0}), 5 to 12 MeV (1969LO1E; d_{0}), 13.0 and 15.0 MeV (1972VO1H; d_{0}) and 185 MeV (1968IN02, 1969IN1C; d to ^{8}Be*(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).
Neutron groups are observed corresponding to the ^{10}B states listed in Table 10.16 (in PDF or PS). Thresholds for slowneutron production corresponding to ^{10}B 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; n_{0}, n_{2}, n_{3}) 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 ^{10}B*(1.74) (J^{π} = 0^{+}; T = 1) are brought into accord with shell model predictions when the tbar · Tbar 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 ^{10}B*(3.59) and ≤ 0.3% relative to ^{10}B*(2.16). See also (1965MA50). Observed γtransitions 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 ^{10}B 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 ^{10}B have even parity [from l_{p}]. The ground state is known to have J = 3, by direct measurement, and ^{10}B*(1.74) has J^{π} = 0^{+} and is the T = 1 analogue of the ^{10}C_{g.s.} [from the β^{+} decay of ^{10}C]. Then looking at the branching ratios and lifetimes of the other states, the sequence for ^{10}B*(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 ^{11}B and (1965FO1C, 1966FI01, 1970SR01, 1970WI1C, 1972SR04, 1972SR02, 1973WE1T, 1973WE19), (1966WA1C, 1967LE1F) and (1970FO1B, 1970MI1G, 1973CO16; theor.).
Deuteron groups have been seen corresponding to a number of states of ^{10}B: 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).
Angular distributions have been obtained at E_{α} = 27 MeV (1973KE1E; t_{0}, t_{1}, t_{3}), 28.3 MeV (1965KA14; t_{0}, t_{1}) and E_{α} = 43 MeV (1967DE1K, 1967SI1A; t_{0}, t_{2}). At E_{α} = 27 MeV, ^{10}B*(1.7) is not observed (1973KE1E). See also (1966LA04).
See ^{13}C in (1970AJ04, 1976AJ04)
See ^{10}Be.
Absolute measurements have been made of the ^{10}B(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 ^{10}B 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).
See (1967LO1B).
The quadrupole contribution to the elastic form factor is best accounted for by the undeformed shell model, Q = 7.45 (± 20%) fm^{2}, < r^{2} >^{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 ^{10}B*(0.7)): there is no evidence of an M3 contribution  the magnetic octupole moment ≲ 1.6 fm^{2}, a_{0} = 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 ^{10}B*(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 ^{10}B*(7.48). See also (1972THZF). See also (1966PE1E), (1966IS1A, 1967LE1E, 1968GO1J) and (1967KA1A, 1969UB1B, 1969VI02, 1970LA13; theor.).
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 ^{10}B*(0.7)), angular distributions have been obtained for the neutrons to ^{10}B*(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 ^{10}B states with E_{n} < 6.1 MeV has been studied by (1970NE03). See also (1969HA1R), (1966LA04) and ^{11}B in (1975AJ02).
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 ^{10}B*(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 ^{10}B states: see (1962SC12, 1965HA17, 1969DE1N, 1969WA23): B(E2↑) = 26 ± 5 fm^{4} 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 ^{11}C in (1975AJ02).
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).
Deuteron groups have been observed corresponding to twelve states of ^{10}B: see Table 10.20 (in PDF or PS) (1953BO70, 1962AR02, 1964AR04, 1972ST1M). The very low intensity of the group to ^{10}B*(1.74) (1972ST1M) and the absence of the group to ^{10}B*(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; d_{0}), 7.0 and 9.0 MeV (1972ST1M; d_{2} and d_{3}), 11.8 MeV (1967FI07; d_{0}, d_{1}. d_{3}, d_{4}, d_{5}, d_{6} and d to unresolved 6 MeV states) and 28 MeV (1968GA13, 1968ME1E; d_{0}; see for optical parameters). See also (1966BR1G), (1968NE1A, 1969NE08; theor.) and ^{12}C in (1975AJ02).
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).
Angular distributions of elastically scattered ^{3}He have been measured at E(^{3}He) = 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(^{3}He) = 32.5 MeV to ^{10}B*(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 ^{3}He ions to ^{10}B*(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).
Angular distributions of elastically scatted αparticles have been measured at E_{α} = 5 to 30 MeV (1972DA04) and at 56 MeV (1969GA11). For optical model parameters see (1970ZE03, 1972DA04). Inelastic αgroups are also reported to ^{10}B*(0.72, 2.16, 3.59, 4.77, 5.11 + 5.17 + 5.18, 5.92 + 6.03, 6.13, 6.56) (1972DA04). ^{10}B*(1.74) is not seen (1967CO1P, 1972DA04). At E_{α} = 24 MeV, analysis of the angular distributions of the αparticles emitted in the decay of ^{10}B*(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 ^{14}N in (1970AJ04).
For reaction (a) see (1970BO1W). The elastic scattering in reaction (b) has been studied at E(^{7}Li) = 24 MeV (1972WE08). See also (1969RO1G; theor.).
See (1967BE1T).
The elastic scattering angular distribution has been measured at E(^{10}B) = 18 MeV (1968VO1A, 1969VO10).
See (1970IS1A).
The elastic scattering in reaction (a) has been studied with E(^{16}O) = 15.0 to 32.5 MeV: see (1968OK06, 1968OK1B, 1969KR03); that in reaction (b) has been studied for E(^{18}O) = 20, 24 and 30.5 MeV (1971KN05). See also (1970BL1E).
The elastic scattering has been studied for E(^{19}F) = 20 and 24 MeV (1971KN05).
The halflife 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 ^{10}B*(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 ^{10}B*(1.7) is G^{V}_{β} = (1.396 ± 0.009) × 10^{49} erg · cm^{3} (1972RO03). See also (1972FR1L). The excitation energies of ^{10}B*(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).
The intensities of the transitions to ^{10}B*(3.59, 5.17) [T = 0 and 1, respectively] depend on the region of the giant dipole resonance in ^{11}B 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 ^{10}Be, and ^{11}B in (1975AJ02). See also (1969MU10).
Angular distributions of deuteron groups have been measured at E_{p} = 19 MeV (1963LE03; d_{0}, d_{1}, d_{2}, d_{3}, d_{4}), 33.6 MeV (1968KU04, 1970KU1D; d_{0}, d_{1}, d_{2}, d_{3}, d_{4}, d_{5} and deuterons to states at 5.18 (unres.), 6.04 (unres.)) and 154.8 MeV (1969BA05, 1969TO1A; d_{0}, d_{1}, d_{2}, d_{3}, d_{4} 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 ^{10}B*(11.4) = 1.1 ± 0.2 MeV (1969BA05). Spectroscopic factors have been extracted by [(1963LE03): PWBA; (1968KU04): DWBA; (1969BA05) and (1969TO1A): DWBA].
Angular distributions have been measured at E_{d} = 11.8 MeV (1967FI07; t_{0}, t_{1}, t_{2}, t_{3}; l = 1; S = 1.88, 0.94, 1.35, 1.35, respectively) and at E_{d} = 21.6 MeV (1967DE1M; t_{0} → t_{5} and t to ^{10}B*(5.1); S_{rel} extracted). A dependence of the angular distribution on the isospin of the final state is discussed by (1967FU04).
Reported levels are listed in Table 10.22 (in PDF or PS) (1965GO05, 1967PU04). See also (1966LA04). Angular distributions have been measured at E(^{3}He) = 1.0, 1.8, 2.15 MeV (1966LO15; α_{0} → α_{3}), 8, 10, 12 MeV (1973CO19; α_{0}) 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 ^{10}B*(5.92, 6.03, 6.13, 6.56, 7.00). The results are consistent with J^{π} = 2^{+} and 4^{+} for ^{10}B*(5.92, 6.03) and require J^{π} = 3^{} for ^{10}B*(6.13). There is substantial interference between levels of opposite parity for the αparticles due to ^{10}B*(6.56, 7.00): the data are fitted by J^{π} = 3^{+} for ^{10}B*(7.00) and (3, 4)^{} for ^{10}B*(6.56) [the ^{6}Li(α, α) results then require J^{π} = 4^{}] (1971YO05). See, however, (1973SI27) in reaction 17. See also (1970LI1K).
See (1968OK06) and (1969BR1D).
See (1972SK08).
Not reported.
Angular distributions of ^{3}He ions have been measured at E_{p} = 39.8 MeV (1973HO10: to ^{10}B*(0, 0.72, 1.74, 2.16, 3.59)) and 185 MeV (1968TI1A, 1972DA26: to ^{10}B*(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.).
Alpha groups have been observed to the known states of ^{10}B below E_{x} = 7.1 MeV: see Table 10.23 (in PDF or PS) (1962AR02, 1965PE17, 1970AN1J). Angular distributions have been determined for α_{0}, α_{1}, α_{3} and α_{4} 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; α_{0}, α_{1}), 6.2 to 6.8 MeV (1965NE10; α_{0}, α_{1}), 12 MeV (1970AN1J; α to ^{10}B*(4.77, 5.11, 5.17, 5.92, 6.03, 6.13, 6.56), 24 MeV (1965PE17; α to ^{10}B*(4.77, 5.17, 6.03)). See also (1969CU08). The population of the isospinforbidden group to ^{10}B*(1.74) [α_{2}] 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 ^{14}N]; 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 α_{2} 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.).
At E_{α} = 42 MeV angular distributions have been measured for the transitions to ^{6}Li_{g.s.} + ^{10}B_{g.s.}, ^{6}Li_{g.s.} + ^{10}B^{*}_{0.72}, (^{6}Li^{*}_{2.19} + ^{10}B_{g.s.}) + (^{6}Li_{g.s.} + ^{10}B^{*}_{2.15}), ^{6}Li_{g.s.} + ^{10}B^{*}_{2.15}, ^{6}Li^{*}_{2.19} + ^{10}B^{*}_{0.72} (1972RU03). See also ^{16}O in (1977AJ02).
See (1969BR1D, 1972MO1E, 1973SC1J).
Angular distributions have been measured at E_{p} = 43.7 and 50.5 MeV for the αparticle groups to ^{10}B*(1.74) [L = 1] and ^{10}B*(6.03) [L = 3] (1972MA21).
See (1969BR1D, 1972MO1E, 1973SC1J).
For reaction (a) see (1959AJ76); for reaction (b) see (1961CL09).
See (1970MC1G).
At E(^{3}He) = 41 MeV, the population of ^{10}B*(0, 0.72, 2.16, 3.59, 6.1) has been observed. The transition to ^{10}B*(1.74) [T = 1] is very weak (1971DE37).
See (1969BR1D).
See (1969HO1H).
See (1969BR1D).
