(See Energy Level Diagrams for 10B)
Astrophysical questions: (1973CO1B, 1973TI1A, 1973TR1B, 1973WE1D, 1974AU1A, 1974JA11, 1974RE1A, 1975ME1E, 1975TR1A, 1976AU1B, 1976AU1C, 1976BO1E, 1976CO1B, 1976EP1A, 1976HA1F, 1976RO12, 1976SI1C, 1976SI1D, 1976VI1A, 1977AU1B, 1977DW1A, 1977HA1L, 1977KO1L, 1977MA1H, 1977PR1D, 1977SC1D, 1977SI1D, 1977ST1J, 1977WE1D, 1978AU1C, 1978DW1A).
Special reactions: (1974BA70, 1974FO22, 1974JA11, 1974LA18, 1975KU01, 1975RA21, 1976BU16, 1976CH28, 1976HI05, 1976LE1F, 1976MI13, 1976NA11, 1976OS04, 1976RA1C, 1976RO12, 1977AR06, 1977FO04, 1977KU1D, 1977SH1D, 1977ST1J, 1977YA1B, 1978BI08, 1978FA1D, 1978GE1C, 1978WE1E, 1978ZE02).
Pion capture and reactions: (1973GO41, 1974CA1G, 1974DA27, 1974DI20, 1974HU14, 1974LE12, 1974LI15, 1974TA18, 1975BA52, 1975GI1B, 1975HU1D, 1975RO1G, 1975VE05, 1976AS1B, 1976BA1R, 1974BO1U, 1976ED1A, 1976EN02, 1976GI01, 1976LI26, 1976RO14, 1976SH01, 1977AM1B, 1977BA2H, 1977BA51, 1977BA1Q, 1977BA2G, 1977BE1W, 1977DO06, 1977HO1B, 1977MA35, 1977PI1C, 1977SM06, 1977TE1A, 1977WA02, 1978BH01, 1978KI08, 1978PE1D).
Q = +84.72 ± 0.56 mb (1978SH1E).
The excitation functions for neutrons [from threshold to Eα = 15.5 MeV (1963ME08)] and for deuterons [Eα = 9.5 to 11.4 MeV (1963BL20; d0); 12 to 25 MeV (1974KO24, 1974LE14, 1976LE1K; d0, d1)] do not show resonance structure. See also 9B, 9Be and 8Be.
Excitation functions of α0 and α1 have been reported for Eα ≤ 18.0 MeV and 9.5 to 12.5 MeV, respectively: see (1974AJ01). Reported anomalies are displayed in Table 10.8 (in PDF or PS). Polarization measurements are reported at E(6Li-bar) = 21.3 and 22.8 MeV (1976EG1A, 1976KA1E). See also 6Li, (1974AJ01, 1974LO1B) and (1975CL01, 1975CL1C, 1975RE1C, 1977BA1N; 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 also (1974AJ01) and 12C in (1975AJ02, 1980AJ01).
Capture γ-rays have been observed for E(3He) = 0.8 to 6.0 MeV. 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). 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 2-, T = 1 for both [there appears to be no decay of these states via α0 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 [see (1974AJ01)] 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 protons has been measured for E(3He) = 0.60 to 4.8 MeV [see (1974AJ01)] and for 1.0 to 2.5 MeV (1975BO55; p0, p2): there is some indication of weak maxima at 1.1, 2.3 and 3.3 MeV. Polarization measurements are reported at E(3He) = 14 MeV by (1976IR02; p0). The evidence for a T = 2 state at Ex ≈ 23 MeV has not been published: see (1974AJ01). See also (1975FO19; astrophys.).
Yields of deuterons have been measured for E(3He) = 1.0 to 2.5 MeV (1975BO56, 1977BO29; d0) and yields of tritons are reported for 2.0 to 4.2 MeV (1969OR01; t0): a broad peak is reported at E(3He) ≈ 3.5 MeV (1969OR01). See also (1974AJ01, 1974LO1B), 8Be and 7Be. For reaction (c) see 7Li.
Excitation functions have been measured for E(3He) = 1.3 to 18.0 MeV: see (1974AJ01). The α0 group (at 8°) shows a broad maximum at ≈ 2 MeV, a minimum at 3 MeV, followed by a step 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). See also (1974LO1B) and 6Li.
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). Slow-neutron threshold measurements have been reported corresponding of the formation of 10B*(0, 0.72, (4.77), (6.42)): see (1974AJ01). 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). For τm measurements see Table 10.9 (in PDF or PS). See also (1978LO1C).
See (1975FO19; astrophsyics).
The Ep = 0.32 MeV resonance (10B* = 6.87 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*(6.87) are 0.92 and 0.39, respectively (1972RE07). See also (1975AU02).
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 γ-rays supports this assignment (1961TA02). The strong M1 transitions to Jπ = 1+, T = 0 levels at 0.72, 2.15 and 5.18 MeV (Table 10.12 (in PDF or PS)) indicate T = 1 (1959WA16). The width of 10B*(5.18) observed in the decay is 100 ± 10 keV (1975AU02).
The exciation 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 + 0.1 sin2 θ, 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 and (1975AU02).
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): unpublished Ph.D. Thesis). 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 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 braod 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*(2.15) [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); unpublished Ph.D. thesis).
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 10.9 (in PDF or PS). See also (1966YO1A, 1973SZ07, 1974SO1D).
Resonances in the neutron yield occur at Ep = 2562 ± 6, 4720 ± 10 and, possibly, at 3500 keV with Γc.m. = 84 ± 7, ≈ 500 and ≈ 700 keV. These three resonances correspond to 10B*(8.889, 10.84, 9.7): see Table 10.13 (in PDF or PS) in (1974AJ01).
The Ep = 2.56 MeV resonance is considerably braoder 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).
Polarization measurements have been carried out for Ep-bar = 2.4 to 2.9 MeV by (1976RO05) who find that it is unlikely that both states at Ex = 8.89 MeV have even parity. (1976BY1A, 1976LI1J, 1977BY1A; abstracts) have compared the polarization and the analyzing power for Ep = 3 to 10 MeV. (1976CR1B; abstract) report measuring an excitation function for Ep-bar = 3.6 to 5.6 MeV as well as the angular distribution of the analyzing power at the 4.72 MeV resonance. The polarization transfer coefficient has been studied for Ep-bar = 3.9 to 15.1 MeV by (1976LI08): negative values of Ky'y (0) are reported near Ep-bar = 7 MeV in a region where several states are known to exist in 10B; a spin-flip mechanism may also be involved.
Differential cross sections have been measured at 0° at Ep = 14.7 and 19.7 MeV (1975MC18) and 29.4, 39.2 and 50.6 MeV (1976RO10). See also (1973AT01, 1975SE1G, 1977LO10), (1976AR1F, 1976NO1E, 1976WA1B, 1976WA1C) and 9B. The 8B yield (reaction (b)) has been measured for Ep = 22.0 to 47.5 MeV (1974DA18). See also (1978BY1B, 1978DE37; theor.).
The elastic scattering has been studied for Ep = 0.2 to 2.7 MeV [see (1974AJ01)] and at 1.95 to 2.8 MeV (1973MA59), 2.3 to 2.7 MeV (1977KI04), 4.0 to 6.0 MeV (1974YA05, 1974YA1C; also p1, p2) and 6.3 to 9.5 MeV (1974WI21; also p2). 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 10.13 (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 strong anomaly is observed at Ep = 6.7 MeV: see Table 10.13 (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).
Polarization measurements have been reported at Ep = 0.9 to 49.8 MeV, at 138.2 and 145 MeV, and at 990 MeV: see (1974AJ01). Recent measurements have been carried out at Ep = 2.0 to 2.8 MeV (1973MA59, 1976MA64) and 5.8 MeV (1974VA03) and at Ep-bar = 32 MeV (1976MO1B). The angular distributions of the depolarization parameter, D, have been studied at Ep-bar = 17 and 25 MeV (1974BI14, 1976BA1Q, 1976BL1B). See also (1970BE1B). Total reaction cross sections are reported at Ep = 20.1 to 46.2 MeV (1974MC19, 1975SL02). For earlier measurements see (1974AJ01). For reaction (b) see 8Be. For spallation studies see (1976KO03, 1977AV01). See also (1973GO41, 1974GU23, 1975CA1L, 1975SE1G, 1978FR1D), (1974LO1B, 1976SH1J), (1974GU24, 1974GU13, 1975BA05, 1975BL10, 1975MA1H, 1976MA58, 1976RA1F, 1977KO1M, 1978BY1B, 1978FA04; theor.) and reactions 20 and 21 in 9Be.
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 (inclusing 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] [see, however, Table 10.8 (in PDF or PS)], 310 keV (1-) and 410 keV (1+; 2+ or 3+ possible) (1973SI27).
Measurements of exciation functions for deuterons and α-particles have been reported at a number of energies to Ep = 15 MeV: see (1974AJ01). Recent measurements include those of (1973MA59: 2.2 to 2.8 MeV; α0), (1977KI04: 2.50 to 2.64 MeV; α2γ), (1974YA1C: 4.0 to 6.0 MeV; d0, α0, α1, α2) and (1974WI21: 6.3 to 9.5 MeV; d0, α0). Observed resonances are displayed in Table 10.14 (in PDF or PS).
Polarization measurements have been made in the range Ep = 0.30 to 15 MeV and at 185 MeV: see (1974AJ01). A recent study is reported at Ep-bar = 15 MeV by (1976DA15; d0, d1). See also 6Li, 8Be, (1976KO03, 1977AV01) and (1974LO1B).
Neutron groups are observed corresponding to the 10B states listed in Table 10.15 (in PDF or PS). Thresholds for slow-neutron production corresponding to 10B states with 4.7 < Ex < 6.6 MeV are displayed in Table 10.17 (in PDF or PS) of (1974AJ01). Angular distributions have been measured from Ed = 0.5 to 16 MeV [see (1959AJ76, 1966LA04, 1974AJ01)] and at 15.25 MeV (1975AZ02; n to 10B*(0, 0.7, 1.7 + 2.2, 3.6, 5.11 + 5.16, 5.92 + 6.03, 6.35 + 6.50)). Observed γ-transitions are listed in Tables 10.6 (in PDF or PS) and 10.16 (in PDF or PS). Reported values of τm are displayed in Table 10.9 (in PDF or PS).
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 analog 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, 2.15, 3.59) is Jπ = 3+, 1+, 0+, 1+, 2+ [see discussion in (1966LA04, 1966WA10)].
At Ed = 83.7 MeV the relative neutron yield down to En = 4 MeV is bell-shaped with a peak at about 34 MeV and a FWHM of ≈ 22 MeV (1976MA43). See also 11B in (1980AJ01), (1973SR1A, 1974KA34, 1975SR01, 1977BA2K, 1977LO10, 1977RI08, 1978LO1C) and (1975AU1C, 1976EA1A; applications).
Deuteron groups have been seen corresponding to a number of states of 10B: see Table 10.17 (in PDF or PS). Angular distributions have been measured at Ed = 10 to 25 MeV [see (1974AJ01)] and at E(3He-bar) = 33.3 MeV (1976KA23) and lead to the lp and spectroscopic factors shown in Table 10.17 (in PDF or PS). For τm see Table 10.9 (in PDF or PS). See also (1973CL1D, 1977RI08) and 12C in (1980AJ01).
Angular distributions have been studied at Eα = 27 MeV (1974KE06; t0, t1, t3), 28.3 MeV (1965KA14; t0, t1) and Eα = 43 MeV (1967SI1A; t0, t2). The transition to 10B*(1.74) [0+; T = 1] is suppressed by at least a factor of five compared to the transitions to the T = 0 states (1974KE06). See also 13C in (1976AJ04).
At E(7Li) = 34 MeV angular distributions have been obtained for the 6He ions to the first four states of 10B. Absolute values of the spectroscopic factors are S = 0.88, 1.38 (p1/2 or p3/2), 1.40 and 0.46 (p1/2), 0.54 (p3/2) for 10B*(0, 0.74, 1.74, 2.15) (FRDWBA analysis) (1977KE09). See also (1974KE06).
Absolute measurements have been made of the 10B(γ, Tn) cross section from threshold to 35 MeV with quasimonoenergetic photons; the integrated cross section is 0.54 in units of the classical dipole sum (60 NZ/A MeV · mb). The (γ, 2n) + (γ, 2np) cross section is zero, within statistics, for Eγ = 16 to 35 MeV (1976KN04). 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 (σmax ≈ 5.5 mb for each of the two maxima) (1973HU09, 1976KN04). 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). See also (1974BU1A, 1976BE1H).
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).
Inelastic groups are displayed in Table 10.18 (in PDF or PS). There is evidence for M1 transition strength to at least one level at Ex ≈ 11 MeV (1976FA13). See also (1977YE1A). No sharp states are observed for 15 < Ex < 20 MeV (1977YE1A). See also (1974AJ01, 1974DE1E, 1975FA1A) and (1973GA19, 1974TA20, 1976DU05, 1978BO09; theor.). At Ee = 700 MeV the proton separation spectra (reaction (b)) are similar to those observed in (p, 2p) except for an upward shift in the exciation (1978NA05).
Angular distributions have been studied for En = 1.5 to 14.1 MeV [see (1974AJ01)] and at En = 4.08 to 8.03 MeV (1978KN01; elastic) and 14.1 MeV (1974HY01; to 10B*(0 + 0.7, 1.7 + 2.2, 3.59, 6.03 and groups of unresolved states at higher Ex). The breakup of 10B + n into 2α + d + n has been studied at En = 14.4 MeV (1975AN1C). See also 11B in (1975AJ02).
Angular distributions have been measured for Ep = 3.0 to 49.5 MeV [see (1974AJ01)] and at 30.3 MeV (1976DE15: to 10B states with Ex < 6.6 MeV). Table 10.19 (in PDF or PS) displays the observed results. The 4+ state at 6.03 MeV is the most strongly excited of the 10B states [see (1974AJ01)]; B(E2↑) = 26 ± 5 fm4 and Γ(E2↓) = 0.14 eV (1965JA1A).
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 40. (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 5.16 → 1.74 is < 0.5% and 5.16 → 3.59 is (4.5 ± 1)% [see Table 10.6 (in PDF or PS)] (1967PA01). See Table 10.9 (in PDF or PS) for τm measurements. See also 11C in (1980AJ01), (1977CO1G) and (1974GU13, 1977PH02; theor.).
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 (1974AJ01). For reaction (b) see (1977WA05) and for reaction (c) see (1974AJ01).
Deuteron groups have been observed corresponding to twelve states of 10B: see Table 10.19 (in PDF or PS). The very low intensity of the group to 10B*(1.74) (1974ST01) and the absence of the group to 10B*(5.16) (1962AR02) is good evidence of theor T = 1 character. Angular distributions have been reported at Ed-bar = 4 to 28 MeV [see (1974AJ01)] and at 6.5 to 12.0 MeV (1974ST01; d2, d3), 13.6 MeV (1975ZA08; d0) and at Ed-bar = 15 MeV (1974BU06; d0). See also 12C in (1980AJ01) and (1977IZ01; theor.).
Angular distributions of elastically scattered tritons have been measured at Et = 1.5 to 3.3 MeV: see (1974AJ01).
Angular distributions of elastically scattered 3He have been measured at E(3He) = 4 to 32.5 MeV: see (1974AJ01). Angular distributions have also been measured at E(3He) = 32.5 MeV to 10B*(0.72, 1.74, 2.15, 3.59, 4.77, 5.11 + 5.16 + 5.18, 6.03, 6.56). L = 2 gives a good fit to the distributions of 3He ions to 10B*(0.72, 2.15, 3.59, 6.03): derived βL are shown in Table 10.19 (in PDF or PS) (1968SQ01).
Angular distributions have been measured at Eα = 5 to 30 MeV and at 56 MeV [see (1974AJ01)] as well as at 24 MeV (1976DE34; to 10B*(0, 0.72, 2.15, 3.59, 4.77, 5.11 + 5.18, 5.92 + 6.03)), 30, 32, 34 and 40 MeV (1976BE1M; α0) and at 50.6 MeV (1976BE1M; α0, α1, α3, α4, α5). 10B*(1.74) is not observed. Sα for 10Bg.s. = 0.29 (1976WO11).
Elastic scattering angular distributions (reaction (a)) have been studied at E(6Li) = 5.8 (1976PO02) and 30 MeV (1977KE09). The elastic scattering in reaction (b) has been studied at E(7Li) = 24 MeV (1972WE08). See also (1974KO1G).
Elastic scattering angular distributions have been measured at E(10B) = 18 MeV (1968VO1A, 1969VO10) and 100 MeV (1975NA15, 1977TO02). For fusion cross section measurements see (1976ST12, 1977HI01). See also (1973BR1C) and (1978AV1A; theor.).
The elastic scattering angular distribution has been studied at E(10B) = 100 MeV (1975NA15). For fusion cross-section measurements see (1977HI01, 1977WU1B, 1978KO1J, 1978WU1B, 1978WU1C). See also (1978RO1D; astrophys.) and (1977MO1J; theor.).
Elastic scattering angular distributions (reaction (a)) have been studied with E(16O) = 15.0 to 32.5 MeV [see (1968OK06, 1968OK1B, 1969KR03)] and at E(10B) = 100 MeV (1975NA15, 1977TO02). For fusion cross section measurements see (1977GO1C). The elastic scattering in reaction (b) has been studied for E(18O) = 20, 24 and 30.5 MeV (1971KN05).
The elastic scattering has been investigated for E(19F) = 20 and 24 MeV (1971KN05).
The weighted mean of earlier values of the half-life is 19.42 ± 0.06 sec: see (1974AJ01). Recent values are τ1/2 = 19.28 ± 0.02 sec (1974AZ01). And 19.151 ± 0.026 sec (1974RO21): we adopt the average, τ1/2 = 19.255 ± 0.053 sec (1975HA45). The decay is to 10B*(0.7, 1.7): see Table 10.20 (in PDF or PS) for branching ratios and log ft. The "corrected" ft value for the transition to 10B*(1.7) is then 3108 ± 31 sec, based on Eβ+(max) = 1910.22 ± 0.59 keV to 10B*(0.7) [see 10B(p, n)10C] (1975HA45). 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). Based on the decay 10Cg.s. → 10B*(1.7) and on other 0+ → 0+ decays, (1975HA45, 1977TO11) find an effective coupling constant G'V = (1.4128 ± 0.0005) × 10-49 erg · cm3, in agreement with the CVC hypothesis. The Fierz interference constant bF ≤ 0.006 (1975HA45). See also (1975RA37), (1974AS07, 1974WI02, 1975KR14, 1977AZ02, 1977RI08, 1977SZ03, 1978SZ03; theor.) and this footnote (Note added in proof: Q0 = -23360.74 ± 0.5 keV (J.A. Nolen, private communication): this leads to an atomic mass excess of 15699.9 ± 0.5 keV for 10C.).
The intensities of the transitions to 10B*(3.59, 5.16) [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 11B in (1980AJ01).
Angular distributions of deuteron groups have been measured at Ep = 17.7 MeV (1977GU14; d0, d1), 19 MeV (1963LE03; d0 → d4), 33.6 MeV (1968KU04; d0 → d5 and deuterons to states at 5.18 (unres.), 6.04 (unres.)), and 154.8 MeV (1969BA05, 1969TO1A; d0 → 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 (1969FI1A; t0 → t3; l = 1; S = 1.88, 0.94, 1.35, 1.35, respectively). The transition to 10B*(2.15) proceeds predominantly via a p3/2 transfer whereas a dominant p1/2 transfer occurs for the transition to 10B*(0.72) (1974VA1E; Ed-bar = 27.8 MeV). See also (1974AJ01) and 13C in (1981AJ01).
Reported levels are displayed in Table 10.21 (in PDF or PS). Angular distributions have been measured at a number of energies between E(3He) = 1.0 and 33 MeV: see (1974AJ01). For the decay of the observed states see Table 10.6 (in PDF or PS); for lifetime measurements see Table 10.9 (in PDF or PS).
The αα 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 18.
Angular distributions of 3He ions have been measured at Ep = 39.8 MeV (1973HO10; to 10B*(0, 0.72, 1.74, 2.15, 3.59)), 51.9 MeV (1977YA10; to 10B*(0, 0.72, 1.74, 2.15, 3.59, 4.77, 5.16, 5.92, 6.56, 7.50, 8.90)) and 185 MeV (1972DA26; to 10B*(0, 1.0, 1.7, 2.5, 3.5, 4.8, 6.0, 7.3)). See also (1974KA15). In reaction (b) (1978DE1N) report the excitation of the first four states of 10B. See also (1977GR04: Ep = 75 MeV; spectroscopic factors). See also (1976HU1B) and (1974ZH01, 1975BA1H; 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) in (1974AJ01). Angular distributions have been measured for Ed = 5.0 to 29.1 MeV [see (1974AJ01)] and at 13.8 to 16.0 MeV (1974JO01; α2), 14 and 15 MeV (1974JO01; α0, α1, α3), at Ed-bar = 20.7 and 29 MeV (1977CO17; α0, α1, α3, α4, α5), and at Ed = 40 MeV (VA76; α0, α1, α3, α4, α5). Single particle S-values are 1.5, 0.5, 0.1, 0.1 and 0.3 for 10B*(0, 0.72, 2.15, 3.59, 4.77) (1976VA07; ZRDWBA). A study of the ms = 0 yield at Ed-bar = 14.5 MeV (θ = 0°) leads to assignments of 3+, 2- and (3+, 4-) for 10B*(4.77, 5.11, 6.56) (1975KU15).
For reaction (a) see (1974AJ01). For reaction (b) see (1974AN36). Angular distributions (reaction (c)) have been measured at E(14N) = 53 MeV (1976ZE04; to 10B*(0, 0.72, 2.15, 3.59)) and 78.8 MeV (1977MO1H; to 10B*(0, 0.72, 2.15)). See also 16O in (1982AJ01).
Angular distributions have been measured for Ep = 5.8 to 18.0 MeV (1975OB01; α0 and α2 from Ep = 7.95 MeV) and at 43.7 and 50.5 MeV (1972MA21; α2 (L = 1) and α to 10B*(6.03) (L = 3)). See also 14N in (1976AJ04).