
^{10}B (1966LA04)(See Energy Level Diagrams for ^{10}B) GENERAL: See (1959BA1F, 1959BR1E, 1960TA1C, 1961TR1B, 1962IN02, 1963BU1C, 1963KU03, 1963ME01, 1963MO1F, 1963OL1B, 1963VL1A, 1963WA1M, 1964AM1D, 1964BA29, 1964FR1D, 1964GR1J, 1964MA1G, 1964NE1E, 1964OL1A, 1964ST1B, 1964VA1D, 1965FA1C, 1965NE1C). See also Table 10.6 [Table of Energy Levels] (in PDF or PS). Ground State:
Six resonances are observed in the range E_{α} = 0.5 to 2.6 MeV, corresponding to ^{10}B*(4.76  6.06 MeV): see Table 10.8 (in PDF or PS). No other resonances appear for E_{α} < 3.8 MeV (^{10}B*(6.74)) (1957ME27, 1961SP02). The 4.77 MeV state decays mainly to ^{10}B*(0.7): the ground state decay is < 3% (1957WA07), 8% (1957ME27): see also Table 10.7 (in PDF or PS). The angular distribution of γrays indicates J = 2^{+}, with E2/M1 = 1.8 (1957ME27), 0.64 (1957WA07). The measured ωΓ_{s} ≡ ωΓ_{γ}Γ_{α}/(Γ_{γ} + Γ_{α}) is 0.05 eV: Γ(M1) ≈ 0.01 Γ_{W}, Γ(E2) ≳ 10 Γ_{W}, consistent with the ΔT selection rule for M1 and considerable collective enhancement for E2 (1957ME27, 1957WA07, 1958ME81, 1963WA17). The angular distribution of the γrays from the 5.11MeV state can be made consistent with J = 2^{}; T = 0 if M2/E1 ≈ 0.01 is assumed (1957ME27, 1958ME81). The distributions from E_{x} = 5.17 MeV are consistent with J^{π} = 2^{+} (1957ME27): observations in ^{9}Be(d, n)^{10}B indicate Γ_{α} ≈ Γ_{γ} = 1.3 eV and hence T = 1 (1958ME81, 1959WA16, 1962WA21). A study of αcapture near E_{α} = 1.18 MeV shows the formation of a broad J = 1; T = 0 state (E_{x} = 5.18 MeV, Γ_{c.m.} = 200 ± 30 keV), and its subsequent decay via 3.44 MeV γrays to the J^{π} = 0^{+}; T = 1 state at 1.74 MeV. The observed width corresponds to 0.86 of the single particle limit for swave αformation (1961SP02: see, however, (1962DE10)). See also (1962WA21). For the 5.92 MeV level, J^{π} = 2^{±}, 3^{+}, and 4^{+} are possible. Only J^{π} = 4^{+} gives a satisfactory account of the angular distribution from the 6.03 MeV level (1957ME27).
Reported anomalies in the elastic scattering are listed in Table 10.9 (in PDF or PS) (1962BA03, 1962DE10, 1965SI1B). Angular distributions indicate J^{π} = 1^{+} and 2^{+}, respectively for the 5.18 and 5.92 MeV states. The 1^{+} assignment supports the proposal by (1961TR1B) that the 5.18 MeV state is a member of the doublet formed by twonucleon excitation into the 2s shell, whose other member is the 0^{+}; T = 1 state at 7.56 MeV. The excitation functions for α_{0} and α_{1} (to the 2.18 MeV state of ^{6}Li) particles (1963BL20: E_{α} = 9.50 to 12.50 MeV), d_{0} particles (to the ground state of ^{8}Be) (1963BL20: E_{α} = 9.50 to 11.4 MeV) and neutrons (1963ME08: from threshold, E_{α} = 6.623 MeV, to 15.5 MeV) do not show resonance structure. See also (1956WA29, 1964DE1K).
Reactions (a) and (b) have been studied up to 6 MeV bombarding energy. Deuteron and triton groups have been observed leading to the first four states of ^{10}B with intensities which depend on the incident energy: typically the group to the 0.7 MeV state is very strong and that to the 1.74 MeV state is very weak (1960MO17, 1961BR35, 1961MO02, 1964KI02). See also (1962BE24, 1962BU1C, 1962MC12, 1963LE09, 1964BL1C). For reaction (c) see (1962MC12, 1963NO02).
The excitation curve for reaction (a) is smooth up to E(^{3}He) = 1.8 MeV (1962SE1A, 1963DU12), and shows resonance behavior at E(^{3}He) = 2.2 and 3.25 MeV: the 2.2 MeV resonance has Γ ≈ 280 keV; the 3 MeV resonance is broader (1963DI01, 1963DU12, 1964DI1C). Capture γrays have been observed for E(^{3}He) = 0.8 to 3.0 MeV. The excitation functions for the transitions to the ground and 4.77 MeV states show peaks at E(^{3}He) = 1.1 and 2.2 MeV; those to the 0.72 and 3.59 MeV states show a broad maximum at 1.4 MeV. The observed gamma widths are comparatively large (see Table 10.10 (in PDF or PS)) (1965PA02). The yield of protons (reaction (b)) is relatively flat for E(^{3}He) = 2.5 to 4.8 MeV, with some indication of a weak maximum at ≈ 3.3 MeV at 20° and 50° (1961WO05). The yield of ground state αparticles at 8° (reaction (d)) 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. Angular distributions of α_{1} in the range E(^{3}He) = 2 to 5.5 MeV suggest that the reaction proceeds mainly by pickup (1965FO07: se also (1961WO05)). Angular distributions for E(^{3}He) = 0.8 to 3.0 MeV give indications of the resonances at E(^{3}He) = 1.4 and 2.2 MeV seen in ^{7}Li(^{3}He, γ): J^{π} = 2^{+} or 1^{}; T = (1) for both: Γ_{α} is small (1965PA03).
Observed slow neutron thresholds are listed in Table 10.11 (in PDF or PS) (1957BI84, 1963ME08). At E_{α} = 13.5 and 13.9 MeV, angular distributions of the groundstate neutrons have been determined (1962KJ05). See also (1959HE1B, 1962GA1L).
Parameters of observed resonances are listed in Tables 10.12 (in PDF or PS) and 10.13 (in PDF or PS). Table 10.7 (in PDF or PS) summarizes the γtransitions from this and other reactions. The E_{p} = 0.33 MeV resonance (^{10}B*(6.88)) 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) indicate a T = 1 admixture of 20% or more (1956WI16, 1959ME85). A small P_{2} term in the angular distribution at resonance suggests a dwave admixture. The angular correlation of 6.88 → 0.72 → g.s. is consistent with J^{π} = 1^{} but does not exclude 2^{} (1964BI18). The proton capture data near E_{p} = 1 MeV appears to require at least 5 resonant states, at E_{p} = 938, (980), 992, 1086 and 1290 keV. The narrow E_{p} = 1086 keV level (^{10}B*(7.56)) is formed by pwave protons, J^{π} = 0^{+} [see ^{9}Be(p, p) and ^{9}Be(p, α)]. The isotropy of the gamma rays supports this assignment (1961TA02). The strong M1 transitions to J = 1^{+}; T = 0 levels at 0.7, 2.15 and 5.18 MeV (Table 10.13 (in PDF or PS)) indicate T = 1 (1959WA16). 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 = 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 + 0.1 sin^{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 correlation of internal pairs is consistent with an E1/M1 mixture of 3 : 2 (1962EL06). Earlier difficulties with the T = 1 assignment may be resolved if the (p, d) and (p, α) resonances are ascribed to another level (1964HO02). The angular distribution of groundstate radiation at E_{p} = 1330 keV is isotropic and Γ_{γ} = 14.6 ± 1.5 eV (1963FU11), 8.5 eV (1964HO02), supporting E1, T = 1 for this level, E_{x} = 7.75 MeV. Transitions to ^{10}B*(0.7) 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). A resonance for capture radiation at E_{p} = 2.567 ± 0.003 (E_{x} = 8.896 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 = 2^{+}; T = 1 and not to the ^{9}Be(p, n) resonance at the same energy (1956MA55). A fourth resonance is reported at E_{p} = 4.72 ± 0.01 MeV, Γ ≈ 0.5 MeV (1952HA10). For the mean life of the 0.7 MeV state, see Table 10.20 (in PDF or PS). See also (1959KA69, 1959SI1C, 1960GO23, 1960SI04, 1961RI08, 1962BL10, 1962HU05, 1963CO1K, 1964SI03).
Resonances in neutron yield occur at E_{p} = 2.56 and 4.6 MeV: see Table 10.14 (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). Angular distributions in the range E_{p} = 2 to 11 MeV are reported by (1956MA55, 1961AL07, 1963KE03, 1965WA04). Polarization studies have been made by (1961CR1A, 1963KE03, 1965WA04). 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 = 3^{} or 3^{+}: the former assignment is in better accord with charge symmetry and indicates correspondence with ^{10}Be*(7.38). 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). See also (1963HA1G, 1963VA1C).
Elastic scattering has been studied for E_{p} = 0.2 to 2.6 MeV by (1956DE33, 1956MO90): see Table 10.15 (in PDF or PS). Below E_{p} = 0.7 MeV, only swaves are present, exhibiting resonance at E_{p} = 330 keV, J = 1^{} or 2^{}: both proton and deuteron widths are large, while θ^{2}_{α} is small. Further swave resonances, with J = 2^{}, appear at E_{p} = 998 and 1330 keV and a sharp pwave resonance, J = 0^{+}, occurs at 1084 keV. The behavior of pwave phase shifts indicates an additional J = 2^{+} resonance at 980 keV (1956MO90) or near 1100 keV (1956DE33). The behavior at E_{p} = 2.56 MeV requires J ≥ 2 and a large proton width (1956DE33). See also (1959AJ76, 1963AN12, 1964HO02). The yield of p_{0} and p_{1} (to 2.43 MeV state of ^{9}Be) has been determined by (1961RE03) in the range E_{p} = 3.6 to 6.0 and 4.2 to 6.0 MeV, respectively, and for E_{p} = 5.7 to 8 MeV by (1963BL20). Total cross sections and yields of the p_{1} group have also been determined by (1964BI19) for E_{p} = 5 to 15 MeV: a broad maximum near E_{p} = 8 MeV is indicated. Total cross sections have also been measured at E_{p} = 10.2, 142 and 180 MeV (1961JO17, 1961TA06, 1962IG1A, 1963WI12, 1963WI1D). See also (1961JO18) and (1959AJ76). Elastic scattering of polarized protons has been studied at E_{p} = 8.5 and 11.4 MeV (1961RO05, 1961RO13); inelastic scattering has been studied at E_{p} = 7 and 12 MeV (1965FU03). See also (1964BE03, 1964CR1B, 1965BO1L).
See ^{7}Be.
The (p, d) and (p, α) reactions have been studied in the range E_{p} = 0.8 to 3.0 MeV by (1949TH05, 1951NE03, 1956MO90, 1956WE37), E_{p} = 1 to 4.6 MeV by (1965MO27) and for E_{p} = 3.5 to 12.5 MeV by (1963BL20); the (p, α_{2}) reaction, leading to ^{6}Li*(3.56), has been studied from E_{p} = 2.3 to 5.4 MeV by (1954MA26, 1956MA55, 1959MA20). Observed resonances are exhibited in Table 10.16 (in PDF or PS). Both alphas and deuterons are isotropic at the E_{p} = 0.33 MeV resonance, confirming its swave formation: proton and deuteron widths are large, while θ^{2}_{α} is small (1956MO90). A strong maximum for α and d appears at E_{p} = 0.93 MeV, Γ = 130 ± 30 keV, followed by weaker maxima for d at E_{p} = 1.25, 1.65 and 2.3 MeV. Alpha particles show a weak effect at the E_{p} = 2.56 MeV, T = 1 resonance, indicating a small isospin impurity (1956WE37). Angular distributions in the range E_{p} = 0.4 to 1.0 MeV (1951NE03) and 0.8 to 3.0 MeV (1956WE37) show strong interference effects. Analysis of the latter data suggests contributions from three levels, at E_{p} = 0.938 (2^{}), 1.15 (1^{+}) and 1.65 MeV (2^{}) (1964HO02). There is no evidence of further structure in the yield of d_{0}, α_{0} or α_{1} for E_{p} < 12 MeV: in this range direct interaction appears to dominate (1961RE03, 1963BL20, 1965MO27). Polarization of d_{0} has been studied by (1960BA26, 1961LA17, 1964BO33). The yield of 3.56 MeV γrays, associated with α_{2} leading to ^{6}Li*(3.56) (J^{π} = 0^{+}; T = 1), shows strong resonances at E_{p} = 2.56 and 4.49 MeV and a broad rise at E_{p} = 3.5 MeV, suggesting that these states, which are also observed in (p, n), have T = 1 and are the analogues of ^{10}Be*(7.55, 9.26, 9.4) (1959MA20). See also (1959LE27, 1961BE1E, 1961ST1D).
Neutron groups are observed corresponding to ^{10}B states listed in Table 10.17 (in PDF or PS). There have been various reports of additional states: see (1960HJ01, 1960JU04, 1961GA1G, 1962CO23, 1962MO12, 1963KO15) and (1959AJ76). Thresholds for slow neutron production corresponding to ^{10}B states from 4.77 to 6.57 MeV are reported in Table 10.18 (in PDF or PS) (1954BO79). Angular distributions have been studied at many energies (see (1959AJ76) for a summary of the earlier work and (1960BA46, 1961MO15, 1963FE1B, 1964BU14, 1965SI12)). The data, analyzed by stripping theories, show J ≤ 3 and even parity for the first five states of ^{10}B (1952AJ22, 1961MO15) and for the 5.17 MeV state (1962GA11, 1963RI08) while the 5.11 MeV state is well fitted by l_{p} = 0 (1963RI08). Observed γtransitions are listed in Tables 10.7 (in PDF or PS) and 10.19 (in PDF or PS). Reported values of the mean life of the 0.72 MeV state are given in Table 10.20 (in PDF or PS). With an intermediate coupling parameter a/K = 4.75, a mean E2 lifetime of 4 nsec is predicted: the experimental value indicates either a lower value of a/K or some collective enhancement (1957FR1B, 1957KU58, 1962LO02). [Since the ^{10}C βdecay is allowed, J = 0^{+}, 1^{+} for E_{x} = 0.72 MeV; the γtransition from E_{x} = 1.74 MeV established J = 1^{+}.] The 1.74 MeV state, J = 0^{+}; T = 1 analogue of ^{10}Be and ^{10}C, decays via the 0.72 MeV state. The 2.15 MeV state decays relatively strongly to E_{x} = 1.74 MeV, arguing against J = 0, 2, 3: therefore J = 1^{+}. The E2 branch to the ground state is relatively strong compared to IPM predictions (1957KU58). The mean life is 1.35 ± 0.16 psec (1965WA1P). Correlation measurements in the cascade E_{x} = 3.59 → 0.7 → g.s. exclude J = 0 or 3 for the 3.59 MeV state (1956SH94); a spin 1 assignment would permit a strong transition to E_{x} = 1.74 MeV, therefore J = 2^{+}. The 3.59 → 0.7 transition is either M1/E2 = 93/7 or pure E2 (1956SH94). The nγ correlation is isotropic (1962GA11). The large intensity relative to the ground state transition does not fit the IPM (1963WA17). The mean life is 0.096 ± 0.036 psec (1965WA1P). See also (1959CH28, 1959GO78). The 4.77 MeV state has J^{π} = 2^{+}; T = 0 [see ^{6}Li(α, γ)]. No gamma radiation is observed in the present reaction: Γ_{γ}/Γ < 0.05. The relative weakness of the groundstate branch and the absence of the present level in the IPM scheme suggests a collective excitation based on E_{x} = 0.72 MeV (1963WA17). Three levels exist near 5 MeV, at 5.11, 5.17 and 5.18 MeV. For the E_{x} = 5.17 MeV level, the small Γ_{α} and large Γ_{γ} suggest T = 1 (1959WA16) [confirmed in ^{10}B(d, d')]: Γ_{α} ≈ Γ_{γ} = 0.6 eV (1963WA17), Γ_{γ}/Γ = 0.7 ± 0.35 (1962WA21), Γ_{γ}/Γ=1 ± 0.2 (1963RI08). The mean life is < 0.08 psec (1965WA1P). Angular correlations confirm the even parity assignment and indicate J^{π} = 2^{+} (1962GA11, 1963WA17). The 5.18 MeV level is excited only weakly, if at all, in the present reaction (1963FE1B, 1963RI08). See also (1959HA1K, 1959LE1E, 1959SI1A, 1961HO1D, 1962LE1C, 1963MO1L, 1964BA1V, 1964SI02, 1965MA1K).
At E(^{3}He) = 5.7, 8.8 and 10.2 MeV, deuteron groups are observed corresponding to the ground state and to states at 0.72, 1.74, 2.15 and 3.58 MeV (1959HI69, 1960HI08: see Table 10.21 (in PDF or PS)). Angular distributions of deuterons to these states have been determined at a number of energies up to E(^{3}He) = 25 MeV (1959HI69, 1960HI08, 1960WE04). Deuteron groups have also been observed to ^{10}B*(4.77, 5.11, 5.17, 5.92, 6.03, 6.13 and 6.57 MeV). There is no indication of earlier reported levels at E_{x} = 5.58 and 6.40 MeV (1965CR1C, 1965YO1E). See also (1962WE1C).
See (1960GO04, 1960VL03, 1962WE1C).
See (1964BO1M).
See ^{10}Be.
Energy levels are reported in ^{10}B [from reaction (a)] at E_{x} = 10.25, 10.75, 11.85, 12.25, 14.7 and 16.9 MeV, assuming that the neutron transitions are to the ground state of ^{9}B. The giant dipole resonance appears to peak at 11 MeV (1962FI07). Cross sections have been measured with monoenergetic γrays for E_{γ} = 8.9 to 10.8 MeV: the value at 8.9 MeV leads to Γ_{γ} = 0.6 ± 0.3 eV for the E_{x} = 8.89 MeV level(s) (1964GR40). For reactions (b), (c), (d), see (1959AJ76) and (1962CH26, 1962VO1D).
See (1964LO1C).
Elastic scattering at θ = 180° gives evidence of an M3 contribution (1965GO1K: see also (1965RA1D)). At E_{e} = 41.5 MeV (θ = 180°) evidence is reported for the M1 excitation of three states with J^{π} = 2^{+}, 3^{+} or 4^{+} at E_{x} = 7.9, 11.8 and 14.0 MeV, with Γ_{γ} in the range 10 to 40 eV (1962ED02). At E_{e} = 55 MeV, transitions are observed to ^{10}B*(6.02 ± 0.02 and 7.48 ± 0.02 MeV), the latter with Γ = 40 keV, Γ_{γ}(M1) = 11 ± 2 eV, assuming J^{π} = 2^{+} (1965SP04: see E_{x} = 7.47, Table 10.15 (in PDF or PS)). See also (1959ME24, 1962BA1D, 1963GO04, 1963RO1M). At 100  200 MeV, (1965FR07) find strong E2 excitation of the 6.02 MeV level.
See (1956DA23, 1960AN14, 1963GL1F).
Excited states observed in inelastic scattering are listed in Table 10.22 (in PDF or PS). Levels observed at E_{x} = 5.92, 6.03, 6.13 and 6.55 MeV correspond well with those reported in ^{9}Be(d, n)^{10}B: no level at E_{x} = 6.43 MeV is seen in the present reaction. A broad level at E_{x} = 7.00 MeV may correspond to a peak reported in ^{9}Be(p, d) at E_{p} = 0.48 MeV. The J = 2^{}; T = 1, 7.48 MeV state is seen here, but not in (d, d') (1964AR04). At E_{p} = 17.9 MeV angular distributions are strongly peaked forward. Comparison of σ(p, p') with E2 transition rates suggests that the strongest (p, p') transitions correspond to states having large E2 coupling to the ground state: the strength of the 6.04 MeV 4^{+} level is particularly significant (1962SC12), B(E2) = 29 fm^{4} (1964JA03). At E_{p} = 185 MeV, the Q = 6.1 MeV peak is dominant. Others are observed corresponding to E_{x} = 0, 2.2, 3.6, 5.2, 7.55, 11.0 and 13.0 MeV. The angular distribution of the Q = 7.55 MeV group is similar to that of the Q = 3.6 MeV group of ^{6}Li (1965HA17). Inelastic cross sections at E_{p} = 153 MeV yield M^{2} = 11, 0.02, and 0.66 for γtransitions from ^{10}B*(2.15) to g.s., 0.7 and 1.74 (1961CL09). At E_{p} > 3 MeV, γrays with E_{γ} = 710 ± 15, 1023 ± 5, 1438 ± 5, 2120 ± 60, 2880 ± 10 and 3560 ± 50 keV are observed (1957HU79, 1957MC35). Upper limits to the transitions 1.74 → g.s. and 3.59 → 1.74 are 2 and 3% (1964SI03). See also (1965SE1F).
The summed proton energy spectrum, observed at E_{p} = 150 to 460 MeV shows peaks corresponding to removal of an l ≠ 0 proton at Q = 6.7, 11.9 and 17.1 MeV; for removal of an l = 0 proton, Q = 30.5 MeV (1966TY01). See also (1962DI1A, 1963BE42, 1964BA1C, 1964LI1D, 1965RI1A) and ^{9}Be.
Deuteron groups have been observed corresponding to eleven excited states of ^{10}B: see Table 10.22 (in PDF or PS). The absence of the groups (upper limit to intensity 1.5%  4%) corresponding to the 1.74 and 5.17 MeV states is good evidence of their T = 1 character (1962AR02). See also (1959TO1A, 1962SL03).
See (1963HO19).
See (1961AN07).
The half life is 19.48 ± 0.05 sec (1962EA02), 19.27 ± 0.08 sec (1963BA52): E_{β+}(max) = 1.865 ± 0.015 MeV (1963BA52). The β^{+} decay is to the first two excited states of ^{10}B: relative transition probabilities to the 0.72, 1.74 and 2.15 MeV levels are 98.4/1.65 ± 0.2/< 0.1 (1953SH38): ft (from τ_{1/2} = 19.41 sec, Q_{m} above) are 1.0 × 10^{3} and 2.2 × 10^{3} to the 0.72 and 1.74 MeV states, respectively (1966BA1A).
See (1951SH63).
At E_{p} = 19 MeV, the ground state and the first four excited states have been observed. From the angular distributions, analyzed by PWBA, l_{n} = 1, θ^{2} = 0.011, 0.029, 0.011 and 0.0031 (1961LE1A, 1963LE03). At E_{p} = 155 MeV, deuteron groups are reported to states at 0, 2.0, 5.0, 6.9 and 11.4 MeV (1963BA2F). See also (1956RE04, 1960NE1C, 1961CL09, 1964SH07).
Reported levels are listed in Table 10.23 (in PDF or PS). No evidence is found for previously reported levels at E_{x} = 2.86, 5.58 and 6.40 MeV (1963GA03, 1965GO05). See also (1965RO01). The apparent absence of the E_{x} = 5.18 MeV group is ascribed partly to its breadth and partly to its presumptive twoexcited nucleon character (1965GO05). The angular distributions of alpha particles corresponding to the lower states indicate strong direct interactions, l = 1 at E(^{3}He) = 2.3 to 5.5 MeV (1960TA12, 1965FO06: see also (1965GO05)); the distributions of α_{2} (E_{x} = 1.74 MeV) vary strongly with energy (1965FO06). Alphagamma coincidence studies yield Γ_{γ}/Γ < 4 × 10^{4} for ^{10}B*(4.77), ≈ 1 for ^{10}B*(5.17) (1965RO01). See also (1961BO33, 1964EL1B, 1964GA1B). The τ_{m} of the 1.74 MeV state is 0.15 ± 0.02 psec (1965LO04).
Not reported.
Alpha groups have been observed to all of the known states of ^{10}B up to 5.1 MeV: the intensity of the α_{2}group to the 0^{+}; T = 1 state at 1.74 MeV is usually sharply reduced (1957EL12, 1961PE09, 1961YA08, 1962AR02, 1963AL16, 1963YA1B, 1965BA06, 1965VO1B, 1966HA09); but its yield varies appreciably with small energy changes (1963AL16). The identification of the αgroups to the 5.1 MeV states indicates that the T = 1 state at 5.17 MeV is not excited at E_{d} = 10 MeV (1962AR02). See Table 10.22 (in PDF or PS). Angular distributions of the α_{0}, α_{1}, α_{3} and α_{4}groups have been determined for E_{d} = 9.2 to 19.7 MeV (1961YA08, 1963YA1B, 1965BA06). See also (1958CA1F, 1959HE1C, 1961GA13, 1963JA03, 1963PE07, 1964BA54).
At E_{p} = 12.2 MeV, αgroups are observed to the ground state and to the first three excited states (1963PE07). See also (1962HA1F).
For reaction (a) see (1959AJ76); for reaction (b) see (1961CL09).
