(See Energy Level Diagrams for 10B)
Pion capture and reactions: (1965CH12, 1968BA2G, 1968BO32, 1968NO1A, 1968RI1H, 1968WI1B, 1968TA1C, 1969BU1C, 1969CH1C, 1969CH19, 1969GO1C, 1969KA1L, 1969MO1E, 1970CH1F, 1970BA1E, 1971CA01, 1971CA1J, 1972FU1C†, 1972HU1A, 1972KA1F, 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.
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, 1969LE1B, 1969PE1D, 1969VA1C, 1969WU1A, 1970HI08, 1971TA1A, 1972LE1L, 1972VA36, 1973CO1P, 1973MA1K, 1973SA30, 1973SU1B).
Six resonances are observed in the range Eα = 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).
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 Jπ = 0+; T = 1 state at 7.56 MeV.
Excitation functions of α0 have been reported since (1966LA04) at Eα = 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 Eα = 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 Eα = 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(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 τm measurements see Table 10.9 (in PDF or PS) (1969TH01). See also (1971PO1D), (1966BR1G), (1966RO1E; theor.) and 12C in (1975AJ02).
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 τm measurements see Table 10.9 (in PDF or PS) (1969TH01). See also (1968DA20), (1972GA1E), (1966LA04) and 13C in (1976AJ04).
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 [Eres = 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 Jπ = 2-; T = 1 for both [there appears to be no decay of these states via α2 to 6Li*(3.56) which has Jπ = 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 Jπ = 2+. 10B*(20.2) [3.4 MeV resonance] has an isotropic angular distribution of γ4 and therefore Jπ = 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).
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, Γlab = 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).
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 Ex ≈ 23 MeV, Γ ≈ 0.5 MeV (1968HA1K: unpublished results; W.D. Harrison, private communication).
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.
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: Jπ = 2+ or 1-; T = (1) for both [see, however, reaction 7]: Γα is small (1965PA03). The α2 yield [to 6Li*(3.56), Jπ = 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).
Angular distributions have been measured for the n0 group at Eα = 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 Eα = 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), τm = 2.16 ± 0.43 psec: the "best" value for τm based on this and on other measurements [see Table 10.9 (in PDF or PS)] is 2.4 ± 0.3 psec corresponding to Γγ = 275 ± 35 μeV. The γ-decay of 10B*(2.15) involves Eγ = 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).
The Ep = 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 Jπ = 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 Ep = 1 MeV appears to require at least five resonant states, at Ep = 938, (980), 992, 1083 and 1290 keV. The narrow Ep = 1083 keV level (10B* = 7.56 MeV) is formed by p-wave protons, Jπ = 0+ [see 9Be(p, p), 9Be(p, α)]. The isotropy of the gamma rays supports this assignment (1961TA02). The strong M1 transitions to Jπ = 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 Ep = 992 (Γ = 80 keV) and 1290 keV (Γ = 230 keV) (1962EL06, 1964HO02). Elastic scattering studies indicate s-wave formation and Jπ = 2- for both (1956MO90). For the lower level (Ex = 7.48 MeV) the intensity of the g.s. capture radiation, Γγ = 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 Jπ = 2+ level at Ep = 980 keV (1956MO90, 1962EL06: see, however, (1964HO02)).
The angular distribution of ground-state radiation at Ep = 1330 keV is isotropic and Γγ = 8.5 eV (1964HO02), supporting E1, T = 1 for this level (Ex = 7.75 MeV). See, however, (1973RO24): reaction 15.
Transitions to 10B*(0.7) [γ1] show resonance at Ep = 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 Jπ = 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 Ep = 2.567 ± 0.003 (Ex = 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), Jπ = 2+; T = 1 and not to the 9Be(p, n) resonance at the same energy (1956MA55). A further resonance is reported at Ep = 4.72 ± 0.01 MeV, Γ ≈ 0.5 MeV (1952HA10).
In the range Ep = 4 to 18 MeV, the γ0 yield at 90° shows the resonance at Ep = 4.7 MeV (Ex = 10.7 MeV) and shows fluctuations suggesting states at Ex ≈ 14.6, 15.6 and 19.7 MeV. It is suggested that 10B*(19.7) decays via E1 and therefore Jπ = 2-, 3-, 4-. The other three states presumably decay by M1 and therefore Jπ = 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 Ex ≈ 14.5 MeV. Fluctuations in the γ1 yield are reported at Ex ≈ 12.6, 13.3 and 14.1 MeV. These states presumably decay by M1 to 10B*(0.7) [Jπf = 1+] and therefore Jπi = 0+, 1+, 2+. The weak γ2 yield (to 10B*(1.74) [Jπ = 0+; T = 1]) seems to exhibit a broad peak centered near Ex = 15 MeV (maximum 90° differential cross section ≈ 0.5 μb/sr) and possibly some structure near Ex = 20 MeV. The γ3 yield (to 10B*(2.16) [Jπ = 1+]) increases to ≈ 0.4 μb/sr at Ex ≈ 16 MeV and seems to remain constant beyond that energy, with some suggestion of a fluctuation corresponding to Ex ≈ 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).
Resonances in neutron yield occur at Ep = 2.56 and 4.7 MeV: see Table 10.13 (in PDF or PS). There is some indication of a broad maximum near Ep = 3.5 MeV; a peak reported at Ep = 4.9 MeV for n1 neutrons may reflect the effect of this level (1959MA20). A sharp break at Ep = 6.55 ± 0.03 MeV is ascribed to a level in 9B at 4.04 MeV (1964BA16). See also (1972VO17).
The Ep = 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 Jπ = 3- or 3+: the former assignment is in better accord with 10Be*(7.37). For Jπ = 3-, θ2n = 0.135, θ2p = 0.115 (R = 4.47 fm). The Jπ = 2+ level should contribute about 10% to the cross section at Ep = 2.56 MeV (1962AL1A).
Elastic scattering has been studied for Ep = 0.2 to 2.7 MeV by (1956DE33, 1956MO90, 1969MO29, 1973RO24). Below Ep = 0.7 MeV only s-waves are present exhibiting resonance at Ep = 330 keV [10B*(6.88)], Jπ = 1-. Between Ep = 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 Ex = 7.48 MeV, a sharp 0+ state at Ex = 7.56 MeV, and a 1- state at 7.82 MeV: see Table 10.14 (in PDF or PS) (1956MO90, 1973RO24).
Pronounced minima at Ep = 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) (1970AN1B). A resonance corresponding to 10B*(8.89) is also reported by (1956DE33). The yield of p0, p1 and p2 has been measured for Ep = 4.2 to 6.0 MeV by (1972YA06): structures are reported at Ep ≈ 4.7 MeV (Γ ≈ 0.3 MeV) in the p2 yield and at Ep ≈ 5.1 MeV in the p1 yield (1972YA06). Excitation curves for the p0 group have been measured for Ep = 6.0 to 15.0 MeV (1972VO17, 1973VO02): a strong anomaly is observed at Ep = 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 Ep = 13 to 30 MeV: only the volume real potential depth VR and the surface imaginary potential depth WS 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, 1970SI1F, 1971SI1K), are in error: see (1970CO06, 1972GO1Q). See also (1965HU10, 1967CA1K, 1967MC1E, 1970BO1Y).
Cross section measurements have also been reported at Ep = 6.36 to 6.48 MeV (1971VA34; yield of p1), 16.2 to 29.1 MeV (1973MO02; σR, and also σ for p2 and p3), 24.4 to 45.9 MeV (1969MC1A; σR), and 232 to 553 MeV (1972RE06; σR). See also (1966LA04) for the earlier work.
Polarization measurements involving the elastic group have been carried out at Ep = 0.9 to 2.7 MeV (1973RO24), 0.9 to 3.0 MeV (1970AN1B), 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 Ep = 11.0 MeV), 14.5 MeV (1965RO22), 17.8 MeV (1966BA2B), 25 MeV (1973BI1H, 1973BI1N), 30.3 MeV (1967WA1G), 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 (1973VO1L). Polarization measurements on the proton group to 9Be*(2.4) [p2] have also been carried out at Ep = 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.).
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 Ep = 28 to 697 keV with ± 5 - 6% uncertainty. The value of Sc.m. (E = 0) for the combined cross sections is estimated to be (35+45-15) MeV · b. At the 0.33 MeV resonance (Jπ = 1-), σα0 = 360 ± 20 mb and σd0 = 470 ± 30 mb. The data (including angular distributions), analyzed by an R-matrix compound nucleus model, were fitted by assuming three states at Ep(c.m.) = -20 keV (Jπ = 2+; 3+ possible) [Ex = 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 Ep = 0.2 to 2.0 MeV have been reported by (1969TU1A): the total cross section is reported to show definite peaks at Ep = 0.330, 0.450, 0.935 and 1.80 MeV. The yields of α0 and d0 have also been measured for Ep = 0.3 to 0.9 MeV by (1968BE1N), and the yield of d0 has been obtained at several angles for Ep = 6 to 15 MeV (1972VO1H). The total cross sections for d0 and d1 have been measured for Ep = 17.0, 21.0, 25.0 and 29.1 MeV (1973MO02). See also (1970BO1Y, 1971GU23). Polarization measurements have been made at Ep = 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 Ep = 1 to 3 GeV by (1969ED02). See also (1966MI1E, 1969CO1J), and (1969KO1P, 1971MC1H, 1971SA1J).
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: Ed = 2.6 to 3.2, and 7 MeV; see Table 10.16 (in PDF or PS)), (1967FI01: Ed = 3.0, 3.5 and 5.5 MeV; see Table 10.16 (in PDF or PS)), (1967FU04: Ed = 5.5 MeV; n0, n2, n3) and (1973PA14: Ed = 7.0, 12.0, 15.0, 16.0 MeV; Ex < 6.6 MeV). See also (1969RO14, 1971DE2C). The values of lp 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) (Jπ = 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: Ed = 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 τm 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 lp]. The ground state is known to have J = 3, by direct measurement, and 10B*(1.74) has Jπ = 0+ and is the T = 1 analogue of the 10Cg.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 Jπ = 3+, 1+, 0+, 1+, 2+, respectively [see discussion in (1966LA04, 1966WA10)].
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 Ex = 5.58 and 6.40 MeV (1966FO08). Angular distributions obtained at Ed = 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 lp and the spectroscopic factors shown in Table 10.19 (in PDF or PS). See also (1971BI1D), (1967LE1F) and (1968TA1A, 1972DZ1A, 1973CO16; theor.). For τm measurements see Table 10.9 (in PDF or PS) (1966FI01, 1968FI09).
Angular distributions have been obtained at Eα = 27 MeV (1973KE1E; t0, t1, t3), 28.3 MeV (1965KA14; t0, t1) and Eα = 43 MeV (1967DE1K, 1967SI1A; t0, t2). At Eα = 27 MeV, 10B*(1.7) is not observed (1973KE1E). See also (1966LA04).
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 Ex = 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 (1964GR1A) 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 [Jπ = 2+], 9.2 ± 0.1 [3+] and (≈ 10.5) [π = +] MeV, with T = 1. See (1959AJ76, 1966LA04) for reactions (c) and (d).
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 Ee = 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 Ee = 29.2 to 57.8 MeV (1966SP02) has studied the inelastic groups corresponding to Ex = 6.014 ± 0.020 (Jπ = 4+, E2) and 7.477 ± 0.020 MeV (Jπ = 2+, M1)†: Γγ0 = 0.122 ± 0.020 eV and 12.0 ± 2.2 eV††, and Γγ0/Γw = 14 and 1.4, respectively. Γtot ≈ 40 keV for 10B*(7.48) (1966SP02). A number of other inelastically scattered electron groups are reported by (1966KO08) at Ee = 50 MeV: Γγ0 values are given (± 50%). See also (1965FR07, 1965VA1G).
† See, however, Table 10.11 (in PDF or PS).
Elastic angular distributions have been measured for En = 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: En = 7.02 and 7.55 MeV), (1970CO12: En = 9.72 MeV) and (1968AL1E, 1970VA19: En = 14.1 MeV). The gamma decay of 10B states with En < 6.1 MeV has been studied by (1970NE03). See also (1969HA1R), (1966LA04) and 11B in (1975AJ02).
Angular distributions of elastically scattered protons have been measured at Ep = 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 Ep = 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 Eγ = 718.5 ± 0.2 keV and 1021.5 ± 0.5 keV (1966FR09: from decay of Ex = 718.5 ± 0.2 and 1740.0 ± 0.6 keV) and Eγ = 720.1 ± 2.0, 1022.0 ± 2.0, 1435.1, 2155.6 ± 2.0 and 2868.5 ± 2.0 keV (1969PA09: from decay of Ex = 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 τm measurements (1966FI01, 1968FI09). See also (1971SC1N) and (1969TI02, 1973HU05, 1973KA04, 1973ZW1A; theor.). See also 11C in (1975AJ02).
The summed proton spectrum (reaction (a)), observed at Ep = 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 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 Ed = 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).
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 βL are shown in Table 10.20 (in PDF or PS) (1968SQ01). See also (1967CO1J, 1970BA1P) and (1968HO1C).
Angular distributions of elastically scatted α-particles have been measured at Eα = 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 Eα = 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).
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).
The elastic scattering has been studied for E(19F) = 20 and 24 MeV (1971KN05).
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 GVβ = (1.396 ± 0.009) × 10-49 erg · cm3 (1972RO03). See also (1972FR1L). The excitation energies of 10B*(0.7, 1.7) are Ex = 718.32 ± 0.09 and 1740.16 ± 0.17 keV [Eγ = 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 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).
Angular distributions of deuteron groups have been measured at Ep = 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 Γc.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].
Angular distributions have been measured at Ed = 11.8 MeV (1967FI07; t0, t1, t2, t3; l = 1; S = 1.88, 0.94, 1.35, 1.35, respectively) and at Ed = 21.6 MeV (1967DE1M; t0 → t5 and t to 10B*(5.1); Srel 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(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 Jπ = 2+ and 4+ for 10B*(5.92, 6.03) and require Jπ = 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 Jπ = 3+ for 10B*(7.00) and (3, 4)- for 10B*(6.56) [the 6Li(α, α) results then require Jπ = 4-] (1971YO05). See, however, (1973SI27) in reaction 17. See also (1970LI1K).
Angular distributions of 3He ions have been measured at Ep = 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.).
Alpha groups have been observed to the known states of 10B below Ex = 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 Ed = 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 Ed up to 30 MeV. For Ed ≲ 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 Ed = 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).
At Eα = 42 MeV angular distributions have been measured for the transitions to 6Lig.s. + 10Bg.s., 6Lig.s. + 10B*0.72, (6Li*2.19 + 10Bg.s.) + (6Lig.s. + 10B*2.15), 6Lig.s. + 10B*2.15, 6Li*2.19 + 10B*0.72 (1972RU03). See also 16O in (1977AJ02).
Angular distributions have been measured at Ep = 43.7 and 50.5 MeV for the α-particle groups to 10B*(1.74) [L = 1] and 10B*(6.03) [L = 3] (1972MA21).
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).