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10B (1988AJ01)
(See Energy Level Diagrams for 10B)
GENERAL: See also (1984AJ01) and Table 10.5 [Table of Energy Levels] (in PDF or PS).
Shell and deformed models: (1983VA31, 1984VA06, 1984ZW1A, 1987KI1C, 1988OR1C, 1988WO04).
Cluster and α-particle models: (1983SH38, 1984NI12, 1985KW02).
Special states: (1983BI1C, 1983FE07, 1983VA31, 1984NI12, 1984VA06, 1984ZW1A, 1985GO1A, 1985HA18, 1985HA1J, 1986BA1X, 1986XU02, 1987AB1H, 1987BA2J, 1987KI1C, 1988KW02).
Electromagnetic transitions and giant resonances: (1983GM1A, 1984NI12, 1985GO1A, 1987BA2J, 1987KI1C).
Astrophysical questions: (1982AU1A, 1982CA1A, 1984TR1C, 1985CA41, 1985WA1K, 1987AR1C, 1987AU1A, 1987RO25, 1988KR1G, 1988RE1B).
Complex reactions involving 10B: (1983EN04, 1983GU1A, 1983NA08, 1983OL1A, 1984GR08, 1984HI1A, 1984HO23, 1984RE14, 1984TE1A, 1985KAZQ, 1985LI1B, 1985MO08, 1985WI18, 1986AV1A, 1986CA30, 1986HA1B, 1986MA19, 1986ME06, 1986MO13, 1986SA30, 1986SH1F, 1986UT01, 1986XU02, 1986XU1B, 1987AK1A, 1987AR19, 1987BA38, 1987BA39, 1987BU07, 1987DE37, 1987FE1A, 1987GE1B, 1987HE1H, 1987HI05, 1987JA06, 1987KO15, 1987LY04, 1987MU03, 1987NA01, 1987PO23, 1987RO10, 1987ST01, 1987TR05, 1987WA09, 1987YA16, 1988BL09, 1988CA06, 1988KI05, 1988KR11, 1988RU01, 1988SA19, 1988SI01, 1988TS03).
Applications: (1983AM1A, 1983KU1C, 1985KO47, 1986EN1A, 1986WE1E).
Muon and neutrino capture and reactions: (1983GM1A, 1985MI1D, 1987KU23, 1987SU06).
Pion and kaon capture and reactions (See also reactions 23 and 48.): (1982BE1D, 1983AN1F, 1983BA71, 1983FE07, 1983GE12, 1983GE13, 1983GE1C, 1983GM1A, 1983MA40, 1983ZIZZ, 1984BA1U, 1984CO1D, 1984ER1B, 1984KA1C, 1984MA1F, 1985IM1A, 1985RO17, 1985TU1B, 1985ZI04, 1986BE1P, 1986GA1F, 1986GA1H, 1986MA1C, 1986PE05, 1986RA16, 1986RO03, 1988AB05, 1987LE1E, 1987NA04, 1987SI18, 1988GIZU, 1988GIZT, 1988RIZZ).
Hypernuclei: (1982KA1D, 1983FE07, 1983SH38, 1983SH1E, 1984BO1H, 1984CH1H, 1984ER1A, 1984MA1F, 1984MI1C, 1984MI1E, 1984SH1J, 1984ZH1B, 1985AH1A, 1985DEZY, 1985GU1J, 1986AN1R, 1986CH1P, 1986DA1B, 1986GA1H, 1986MA1C, 1986MA1W, 1987BO1L, 1987MI38, 1987PO1H).
Other topics: (1983BI1C, 1985AN28, 1986IS04, 1986YA1F, 1987BA2J, 1988AJ1B, 1988KW02, 1988OR1C).
Ground-state properties of 10B: (1983ANZQ, 1983VA31, 1984BR25, 1984MIZM, 1984NI12, 1984VA06, 1985AN28, 1985GO1A, 1985HA18, 1985ZI05, 1986DO1E, 1986GL1A, 1986RO03, 1987KI1C, 1987LE33, 1988VA03, 1988WO04).
Q = +84.72 ± 0.56 mb: see (1978LEZA).
Mass of 10B: (1988WA18) have re-evaluated the evidence on the mass of 10B: the mass excess is 12050.99 ± 0.27 keV. This readjustment includes the value obtained by (1984EL05): 12937.32 ± 0.57 μu [mass spectrometer]. I am indebted to A.H. Wapstra for his comments.
Isotopic abundance: (19.9 ± 0.2)% (1984DE53).
B(E2)↓ (V) = 4.18 ± 0.02 e2 · fm4 (1983VE03).
| 1. 6Li(α, γ)10B | Qm = 4.4596 |
Observed resonances are displayed in Table 10.8 (in PDF or PS). For a discussion of isovector parity mixing between 10B*(5.16, 5.11) [2+; T = 1 and 2-; T = 0] see (1984NA07). For a preliminary report involving a target of laser-polarized 6Li atoms see (1987MU13). See also (1984YA1A, 1985CA41; astrophys.).
| 2. (a) 6Li(α, n)9B | Qm = -3.977 | Eb = 4.4596 |
| (b) 6Li(α, p)9Be | Qm = -2.1261 | |
| (c) 6Li(α, d)8Be | Qm = -1.5669 |
The excitation functions for neutrons [from threshold to Eα = 15.5 MeV] and for deuterons [Eα = 9.5 to 25 MeV; d0, d1 over most of range] do not show resonance structure: see (1974AJ01, 1979AJ01). See also (1985GU1J; theor.).
| 3. (a) 6Li(α, α)6Li | Eb = 4.4596 | |
| (b) 6Li(α, 2α)2H | Qm = -1.4750 |
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 10.9 (in PDF or PS). Elastic scattering and VAP measurements are reported for E(pol. 6Li) = 15.1 to 22.7 MeV [see (1984AJ01)] and at E(pol. 6 Li) = 19.8 MeV (1986CAZT; also TAP; prelim.). Small anomalies have been reported in reaction (b) corresponding to 10B*(8.67, 9.65, 10.32, 11.65): see (1984AJ01). See, however, Table 10.5 (in PDF or PS). See also 6Li, (1987BU27), (1986ST1E; applications) and (1986GA1F, 1986YA15, 1988LE06: theor.).
| 4. 6Li(6Li, d)10B | Qm = 2.985 |
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). The d2 group is also observed but its intensity is weak: see (1974AJ01) and 12C in (1980AJ01).
| 5. 7Li(3He, γ)10B | Qm = 17.7873 |
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], 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) in (1979AJ01). 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 α2 to 6Li*(3.56) which has Jπ = 0+, T = 1: see reaction 9]. 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. See (1974AJ01) for references.
| 6.7Li(3He, n)9B | Qm = 9.351 | Eb = 17.7873 |
The excitation curve is smooth up to E(3He) = 1.8 MeV 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. See Table 10.10 (in PDF or PS) in (1979AJ01), (1986AB10; theor.) and (1974AJ01).
| 7. 7Li(3He, p)9Be | Qm = 11.2016 | Eb = 17.7873 |
The yield of protons has been measured for E(3He) = 0.60 to 4.8 MeV: there is some indication of weak maxima at 1.1, 2.3 and 3.3 MeV. Measurements of Ay for the ground-state group at E(pol. 3He) = 14 MeV (1983LE17, 1983RO22) and 33 MeV (1983LE17) and of the polarization at E(3He) = 14 MeV (1984ME11, 1984TR03) have been reported. P = A in this and in the inverse reaction [see reaction 4 in 12C in (1985AJ01) for some additional comments]. For earlier references see (1984AJ01). See also (1986AB10; theor.).
| 8. (a) 7Li(3He, d)8Be | Qm = 11.7606 | Eb = 17.7873 |
| (b) 7Li(3He, t)7Be | Qm = -0.880 | |
| (c) 7Li(3He, 3He)7Li |
Yields of deuterons have been measured for E(3He) = 1.0 to 2.5 MeV (d0) and yields of tritons are reported for 2.0 to 4.2 MeV (t0): a broad peak is reported at E(3He) ≈ 3.5 MeV in the t0 yield. See (1979AJ01) for references. Polarization measurements are reported at E(pol. 3He) = 33.3 MeV for the deuteron groups to 8Be*(16.63, 17.64, 18.15) and for the triton and 3He groups to 7Be*(0, 0.43) and 7Li*(0, 0.48, 4.63): see (1984AJ01).
| 9. 7Li(3He, α)6Li | Qm = 13.328 | Eb = 17.7873 |
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 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. 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 5]: Γα is small. 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: see Table 10.10 (in PDF or PS) in (1979AJ01). Polarization measurements are reported at E(pol. 3He) = 33.3 MeV to 6Li*(0, 2.19, 3.56): see (1984AJ01). See also (1983AN1D, 1984PA1E).
| 10. 7Li(α, n)10B | Qm = -2.7905 |
Angular distributions are reported at Eα = 28 and 32 MeV for the n0, n1 and n2 groups (1985GUZQ; prelim.). See (1979AJ01, 1984AJ01) for the earlier work.
| 11. 9Be(p, γ)10B | Qm = 6.5857 |
Parameters of observed resonances are listed in Tables 10.10 (in PDF or PS) and 10.11 (in PDF or PS). Table 10.6 (in PDF or PS) summarizes the γ-transitions from this and other reactions. For references to the discussion below, see (1974AJ01, 1979AJ01, 1984AJ01).
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. For the 5.16 → 1.74 decay see Table 10.6 (in PDF or PS). 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. The strong M1 transitions to Jπ = 1+, T = 0 levels at 0.72, 2.15 and 5.18 MeV (Table 10.11 (in PDF or PS)) indicate T = 1. The width of 10B*(5.18) observed in the decay is 100 ± 10 keV.
The excitation function for ground-state radiation shows resonance at Ep = 992 (Γ = 80 keV) and 1290 keV (Γ = 230 keV). Elastic scattering studies indicate s-wave formation and Jπ = 2- for both. For the lower level (Ex = 7.48 MeV) the intensity of the g.s. capture radiation, Γγ = 25 eV indicates E1 and T = 1. The angular distribution of γ-rays, 1 + 0.1 sin2θ, is consistent with s-wave formation with some d-wave admixture or with some contribution from a nearby p-wave resonance; possibly a Jπ = 2+ level at Ep = 980 keV.
The angular distribution of ground-state radiation at Ep = 1330 keV is isotropic and Γγ = 8.5 eV, supporting E1, T = 1 for this level (Ex = 7.75 MeV).
Transitions to 10B*(0.7) [γ1] show resonance at Ep = 992, 1290 and 938 keV, Γ = 155 keV. 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.
A resonance for capture radiation at Ep = 2.567 ± 0.003 (Ex = 8.895 MeV) has a width of 40 ± 2 keV and decays mainly via 10B*(0.7) (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. A further resonance is reported at Ep = 4.72 ± 0.01 MeV, Γ ≈ 0.5 MeV.
In the range Ep = 4 to 18 MeV, the γ0 yield at 90° shows [unpublished Ph.D. thesis] the resonance at Ep = 4.7 MeV (Ex = 10.7 MeV) and fluctuations suggest states at Ex ≈ 14.6, 15.6 and 19.7 MeV. 10B*(19.7) possibly 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) [Jfπ = 1+] and therefore Jiπ = 0+, 1+, 2+. The weak γ2 yield (to 10B*(1.74) [Jπ; T = 0+; 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*(2.15) [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 [in an 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. See also (1985KI1B, 1985NE1C; applications), (1984YA1A; astrophysics) and (1983GO28, 1986NA15; theor.).
| 12. 9Be(p, n)9B | Qm = -1.851 | Eb = 6.5857 |
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*(8.890, 10.83, 9.7): see Table 10.13 (in PDF or PS) in (1974AJ01). Cross section measurements for the (p, n) and (p, n0) reactions have been obtained by (1983BY01; Ep = 8.15 to 15.68 MeV) [see also for a review of earlier work]. They indicate possible structure in 10B near 13 - 14 MeV (1983BY01).
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. 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-, θn2 = 0.135, θp2 = 0.115 (R= 4.47 fm): see (1974AJ01).
The analyzing power for n0 has been measured for Ep = 2.7 to 17 MeV (1980MA33, 1983BY02, 1986MU07) as has the polarization in the range Ep = 2.7 to 10 MeV (1983BY02). See (1983BY02, 1986MU07) for discussions of the σ(θ), Ay(θ) and P(θ) measurements. Polarization measurements have also been reported at Epol. p = 3.9 to 15.1 MeV and 800 MeV: [see (1984AJ01)] and at 53.5, 53.9 and 71.0 MeV (1988HE08) [Ky'y, Kz'z]. See also 9B, (1985TE1C), (1985CA41; astrophys.), (1986AL1J; applications) and (1988ZVZZ; theor.).
| 13. (a) 9Be(p, p)9Be | Eb = 6.5857 | |
| (b) 9Be(p, pn)8Be | Qm = -1.6654 | |
| (c) 9Be(p, pα)5He | Qm = -2.47 |
The elastic scattering has been studied for Ep = 0.2 to 9.5 MeV [see (1974AJ01, 1979AJ01, 1984AJ01)] and at Ep = 2.0 to 3.8 MeV (1983AL10). 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 10.12 (in PFD or PS). Pronounced minima at Ep = 2.48 and 2.55 MeV are observed in the polarization (p0): these are ascribed to T = 1 analogs of the 3- and 2+ states 10Be*(7.37, 7.52). A strong anomaly is observed at Ep = 6.7 MeV: see Table 10.12 (in PDF or PS).
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, 1979AJ01)] as well as at Epol. p = 780 MeV and at 1 GeV [see (1984AJ01)]. Recently, Ay measurements have been reported at Epol. p = 200 MeV (1985GLZZ; p0; prelim.) and 220 MeV (1985RO15; p0, p2). For inclusive proton scattering at Epol. p = 303 MeV see (1987MO04). See also (1985SE15). For reaction (b) see (1984WA21, 1986MEZZ, 1988BO47). Reaction (c) at Epol. p = 150.5 MeV has been studied by (1985WA13; Ay). For other high energy studies see (1984AJ01). See also 9Be, (1982BA78, 1985RO1C, 1985TR1A, 1986KO1R), (1984ZU01, 1985SA1G, 1986BA88, 1986MU07) and (1983KA37, 1984SH1K, 1985DY03, 1986HA1K; theor.).
| 14. (a) 9Be(p, t)7Be | Qm = -12.082 | Eb = 6.5857 |
| (b) 9Be(p, 3He)7Li | Qm = -11.2016 |
Polarization measurements (reaction (b)) are reported at Epol. p = 23.06 MeV: see (1984AJ01). For a study at Ep = 190 and 300 MeV see (1987GR11). See also (1985SE15).
| 15. (a) 9Be(p, d)8Be | Qm = 0.5592 | Eb = 6.5857 |
| (b) 9Be(p, α)6Li | Qm = 2.126 |
Knowledge of the cross sections of these two reactions at low energies is of importance for power generation and astrophysical considerations. 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 σ d0 = 470 ± 30 mb. The data (including angular distributions), analyzed by an R-matrix compound nucleus model, were fitted by assuming three states at 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): see (1979AJ01). See also (1988ABZW).
Measurements of excitation functions for deuterons and α-particles have been reported at a number of energies to Ep = 15 MeV: see (1974AJ01, 1979AJ01). Observed resonances are displayed in Table 10.13 (in PDF or PS).
Polarization measurements have been made in the range Ep = 0.30 to 15 MeV and at 185 MeV [see (1974AJ01, 1979AJ01)] and at Epol. p = 60 MeV (1987KA25; Ay; inclusive deuteron spectra). For a fragmentation study at Ep = 190 and 300 MeV see (1987GR11). See also (1983AN1D, 1984BA1L, 1985SE15, 1986ER1B), (1984YA1A, 1985CA41; astrophysics), (1984PA1E) and (1982BR1A; theor.).
| 16. 9Be(d, n)10B | Qm = 4.3612 |
Neutron groups are observed corresponding to the 10B states listed in Table 10.14 (in PDF or PS). Angular distributions have been measured for Ed = 0.5 to 16 MeV [see (1974AJ01, 1979AJ01)], at 8 MeV (1986BA40; n0 → n5, n6+7+8; also at 4 MeV to the latter) and at 18 MeV (1987KAZL; n0, n1). Observed γ-transitions are listed in Table 10.16 (in PDF or PS) of (1979AJ01). See Tables 10.6 (in PDF or PS) and 10.7 (in PDF or PS) here for the parameters of radiative transitions and for τm.
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)].
See also 11B in (1985AJ01), (1983TA17, 1985SM08) and (1986OV1A; applications).
| 17. 9Be(3He, d)10B | Qm = 1.0922 |
Deuteron groups have been observed to a number of states of 10B: see Table 10.14 (in PDF or PS). Angular distributions have been reported at E(3He) = 10 to 33.3 MeV [see (1974AJ01, 1979AJ01, 1984AJ01)]. Spectroscopic factors obtained in the (d, n) and (3He, d) reactions are not in good agreement: see the discussions in (1974KE06, 1980BL02). See also (1986AV01; theor.).
| 18. 9Be(α, t)10B | Qm = -13.2282 |
Angular distributions have been studied at Eα = 27, 28.3 and 43 MeV [see (1979AJ01)], at 30.2 MeV (1984VA07; t0, t1, t3, t4) and at 65 MeV (1980HA33). In the latter experiment DWBA analyses have been made of the distributions to 10B*(0, 0.72, 1.74, 2.15, 3.59, 5.2, 5.92, 6.13, 6.56, 7.00, 7.5, 7.82, 8.9) and spectroscopic factors were derived. The distributions to 10B*(4.77, 6.03) could not be fitted by either DWBA or coupled channel analyses. In general coupled-channels calculations give a better fit to the 65 MeV data than does DWBA (1980HA33; see also for a comparison with the (d, n) and (3He, d) results).
| 19. 9Be(7Li, 6He)10B | Qm = -3.389 |
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): see (1979AJ01). See also (1988AL1G).
| 20. 10Be(β-)10B | Qm = 0.5561 |
See 10Be.
| 21. 10Be(p, n)10B | Qm = -0.2261 |
The yield of the n1 group has been studied for Ep = 0.9 to 2.0 MeV: see 11B in (1990AJ01), (1986TE1A).
| 22. (a) 10B(γ, n)9B | Qm = -8.436 |
| (b) 10B(γ, p)9Be | Qm = -6.5857 |
| (c) 10B(γ, pn)8Be | Qm = -8.2511 |
| (d) 10B(γ, π+)10Be | Qm = -140.125 |
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: see (1979AJ01) and (1988DI02). 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): see (1979AJ01). (1987AH02) [and H. H. Thies, private communication] [using bs] report two broad [Γ ≈ 2 MeV] maxima at 20.2 and 23.0 MeV [± 0.05 MeV] (σ = 5.0 and 6.0 mb, respectively; ± 10%) and a minor structure at Ex = 17.0 MeV. For reactions (b) and (c) see (1988SU14). For reaction (d) see 10Be. See also (1974AJ01) and (1983GO28, 1985GO1A, 1987KI1C; theor.).
| 23. (a) 10B(e, e)10B | |
| (b) 10B(e, en)9B | Qm = -8.436 |
| (c) 10B(e, ep)9Be | Qm = -6.5857 |
| (d) 10B(e, eπ+)10Be | Qm = -140.125 |
Inelastic electron groups are displayed in Table 10.15 (in PDF or PS). (1986FRZZ; prelim.) have measured the form factors for 10B*(0, 1.74, 5.16). For reactions (b) and (c) see (1984AJ01). For reaction (d) see 10Be. See also (1984DO20, 1986PE05, 1987DE43, 1987HI1F) and (1986HA1M; theor.).
| 24. 10B(n, n)10B |
Angular distributions have been studied for En = 1.5 to 14.1 MeV [see (1974AJ01, 1979AJ01)] and at 3.02 to 12.01 MeV (1986SAZR, 1987SAZX; prelim; n1 → n5), 8 to 14 MeV (1983DA22; n0) and 9.96 to 16.94 MeV (1986MU08; prelim.; n0). See also 11B in (1985AJ01, 1990AJ01), (1984TU02) and (1983KO1F; theor.).
| 25. (a) 10B(p, p)10B | |
| (b) 10B(p, 2p)9Be | Qm = -6.5857 |
Angular distributions have been measured for a number of energies between Ep = 3.0 and 800 MeV [see (1974AJ01, 1979AJ01, 1984AJ01)] and at 10 to 17 MeV (1986MU08; p0; prelim.). Table 10.16 (in PDF or PS) displays the states observed in this reaction. The γ-ray results are shown in Table 10.6 (in PDF or PS). See also (1979AJ01). For τm see Table 10.7 (1983VE03).
Axions may cause e+e- pairs in competition with γ-ray emission in an isoscalar M1 transition: a search for axions was undertaken in the case of the 3.59 → g.s. [2+ → 3+] transition. It was negative (1986DE25). A beam dump experiment and other attempts to observe axions are discussed in (1987HA1O). For reaction (b) at Ep = 1 GeV see (1985BE30, 1985DO16; prelim.) and (1974AJ01). See also (1988KRZY), (1985KI1B, 1988KOZL; applied) and 11C in (1985AJ01, 1990AJ01).
| 26. 10B(d, d)10B |
Angular distributions have been reported at Ed = 4 to 28 MeV: see (1974AJ01, 1979AJ01). Observed deuteron groups are displayed in Table 10.16 (in PDF or PS). The very low intensity of the group to 10B*(1.74) and the absence of the group to 10B*(5.16) is good evidence of their T = 1 character: see (1974AJ01).
| 27. 10B(t, t)10B |
Angular distributions of elastically scattered tritons have been measured at Et = 1.5 to 3.3 MeV: see (1974AJ01).
| 28. 10B(3He, 3He)10B |
Angular distributions have been measured at E(3He) = 4 to 46.1 MeV [see (1974AJ01, 1979AJ01, 1984AJ01)] and at 2.10 and 2.98 MeV (1987BA34; elastic). L = 2 gives a good fit of 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) of (1979AJ01). See also Table 10.16 (in PDF or PS) here, 13N in (1986AJ01) and (1987RA36; theor.).
| 29. (a) 10B(α, α)10B | |
| (b) 10B( α, 2α)6Li | Qm = -4.4596 |
Angular distributions have been measured for Eα = 5 to 56 MeV [see (1974AJ01, 1979AJ01, 1984AJ01)] and at 91.8 MeV (1985JA12; α0). Reaction (b) has been studied at Eα = 24 and 700 MeV: see (1979AJ01, 1984AJ01). See also (1983GO27, 1985SH1D; theor.).
| 30. (a) 10B(6Li, 6Li)10B |
| (b) 10B(7Li, 7Li)10B |
Elastic-scattering angular distributions have been studied at E(6Li) = 5.8 and 30 MeV and at E(7Li) = 24 MeV: see (1979AJ01).
| 31. 10B(9Be, 9Be)10B |
Elastic angular distributions have been measured at E(10B) = 20.1 and 30.0 MeV (1983SR01). For yield and cross section measurements see (1983SR01, 1986CU02). See also (1984IN03, 1986RO12; theor.).
| 32. (a) 10B(10B, 10B)10B |
| (b) 10B(11B, 11B)10B |
Elastic angular distributions (reaction (a)) have been studied at E(10B) = 8, 13 and 21 MeV. For yields and reaction (b) see (1979AJ01). See also (1985BE1A, 1985CU1A) and (1984HA43, 1986RO12; theor.).
| 33. (a) 10B(12C, 12C)10B |
| (b) 10B(13C, 13C)10B |
Elastic angular distributions have been measured at E(10B) = 18 and 100 MeV for reaction (a) [see (1979AJ01)] and at 18 - 46 MeV [see (1984AJ01)] and 42.5, 62.3 and 80.9 MeV for reaction (b) (1985MA10). For yield, cross section and fusion experiments see (1983DA20, 1983MA53, 1985MA10, 1988MA07) and (1984AJ01). See also (1984DEZX, 1984HAZK, 1987SAZW), (1982BA1D, 1985BA1T; astrophysics), (1983BI13, 1983DU13, 1984FR1A, 1984HA53, 1985BE1A, 1985CU1A, 1986MA19) and (1983HA1E, 1984HA43, 1984IN03, 1984MAZT, 1985KO1J, 1986RO12; theor.).
| 34. 10B(14N, 14N)10B |
Angular distributions have been reported at E(10B) = 100 MeV and E(14N) = 73.9 and 93.6 MeV: see (1979AJ01, 1984AJ01). For fusion cross section studies see (1979AJ01, 1984AJ01) and (1983DE26). See also (1983BI13, 1983DA10, 1984FR1A, 1984HA53, 1985BE1A, 1985CU1A) and (1983GO13, 1984HA43, 1984IN03, 1985KO1J, 1986RO12; theor.).
| 35. (a) 10B(16O, 16O)10B |
| (b) 10B(17O, 17O)10B |
| (c) 10B(18O, 18O)10B |
Elastic angular distributions (reaction (a)) have been studied at E(16O) = 15.0 to 32.5 MeV and at E(10B) = 33.7 to 100 MeV: see (1979AJ01, 1984AJ01). The elastic scattering for reaction (c) has been studied at E(18O) = 20, 24 and 30.5 MeV: see (1974AJ01). For yield and fusion cross section measurements see (1984AJ01) and (1984GO05). See also (1983BI13, 1984FR1A, 1984HA53) and (1983GO13, 1985HU04; theor.).
| 36. (a) 10B(19F, 19F)10B |
| (b) 10B(20Ne, 20Ne)10B |
The elastic scattering has been investigated for E(19F) = 20 and 24 MeV for reaction (a) and E(10B) = 65.9 MeV for reaction (b): see (1974AJ01, 1984AJ01).
| 37. (a) 10B(24Mg, 24Mg)10B |
| (b) 10B(25Mg, 25Mg)10B |
The elastic scattering for both reactions has been studied at E(10B) = 87.4 MeV: see (1984AJ01). The elastic scattering for reaction (b) has been measured at E(10B) = 34 MeV by (1985WI18).
| 38. (a) 10B(27Al, 27Al)10B |
| (b) 10B(28Si, 28Si)10B |
| (c) 10B(30Si, 30Si)10B |
The elastic scattering for all three reactions has been studied at E(10B) = 41.6 and ≈ 50 MeV [and also at 33.7 MeV for reaction (b)]: see (1984AJ01). See also (1984TE1A).
| 39. (a) 10B(39K, 39K)10B |
| (b) 10B(40Ca, 40Ca)10B |
The elastic scattering has been studied at E(10B) = 44 MeV for reaction (a) (1985WI18) and at 46.6 MeV for reaction (b): see (1984AJ01).
| 40. 10C(β+)10B | Qm = 3.6481 |
The half-life of 10C is 19.255 ± 0.53 sec [see (1974AJ01, 1979AJ01)]: the decay is to 10B*(0.72, 1.74) with branching ratios of (98.53 ± 0.02)% and (1.465 ± 0.014)% and log ft= 3.047 for the transition to 10B*(0.72) and 3.492 ± 0.005 for that to the analog state, 10B*(1.74): see Table 10.20 (in PDF or PS) in (1979AJ01). The excitation energies of the two states are 718.32 ± 0.09 and 1740.16 ± 0.17 keV [Eγ = 718.29 ± 0.09 and 1021.78 ± 0.14 keV]. See (1979AJ01) for a further discussion of the decay. See also (1988GI02, 1988KRZY).
| 41. 11B(γ, n)10B | Qm = -11.4542 |
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: see 11B in (1980AJ01). See also 11B in (1985AJ01, 1990AJ01) and (1984AL22).
| 42. (a) 11B(p, d)10B | Qm = -9.2296 |
| (b) 11B(p, pn)10B | Qm = -11.4542 |
Angular distributions of deuteron groups have been measured at several energies in the range Ep = 17.7 to 154.8 MeV [see (1979AJ01)] and at 18.6 MeV (1985BE13; d0, d1). The population of the first five states of 10B and of 10B*(5.2, 6.0, 6.56, 7.5, 11.4 ± 0.2, 14.1 ± 0.2) is reported. For reaction (b) see (1985BE30, 1985DO16; 1 GeV; prelim.). See also (1988GUZW) and (1988BE1I; theor.).
| 43. 11B(d, t)10B | Qm = -5.1969 |
Angular distributions have been measured at Ed = 11.8 MeV ( t0 → t3; l = 1) [see (1974AJ01)] and at 18 MeV (1987GUZZ, 1988GUZW; prelim.).
| 44. (a) 11B(3He, α)10B | Qm = 9.1236 |
| (b) 11B(3He, 2α)6Li | Qm = 4.6640 |
Reported levels are displayed in Table 10.17 (in PDF or PS). Angular distributions have been measured at a number of energies between E(3He) = 1.0 and 33 MeV [see (1974AJ01)] and at 23.4 MeV (1987VA1I; α0, α1; prelim.). For the decay of observed states see Table 10.6 (in PDF or PS).
The α-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-]. See, however, reaction 15, and see (1974AJ01) for the references. See also (1988GOZB; theor.).
| 45. 11B(7Li, 8Li)10B | Qm = -9.421 |
Angular distributions have been measured at E(7Li) = 34 MeV involving 10B*(0, 0.72, 1.74, 2.15) and 8Lig.s. (as well as 8Li*(0.98) in the case of the 10Bg.s. transition) (1987CO16).
| 46. (a) 12C(γ, d)10B | Qm = -25.1868 |
| (b) 12C(γ, pn)10B | Qm = -27.4114 |
For reaction (a) see (1986SH1M) and 12C in (1990AJ01). For reaction (b) see 12C in (1985AJ01). See also (1984DO17) and (1984CH1A, 1986GU1G; theor.).
| 47. 12C(n, t)10B | Qm = -18.9295 |
See (1985FR07, 1987FR16; En = 319 to 545 MeV). See also (1986DO12).
| 48. 12C(π± , π±d)10B | Qm = -25.1868 |
At Eπ+ = 180 MeV and Eπ- = 220 MeV, 10B*(0.72, 2.15) are populated: see (1984AJ01). At Eπ+ = 150 MeV momentum distributions of pions to unresolved states of 10B are reported by (1987HU13).
| 49. (a) 12C(p, 3He)10B | Qm = -19.6933 |
| (b) 12C(p, pd)10B | Qm = -25.1868 |
Angular distributions of 3He ions have been measured for Ep = 39.8, 51.9 and 185 MeV: see (1979AJ01). 10B*(0, 0.72, 1.74, 2.15, 3.59, 4.77, 5.16, 5.92, 6.56, 7.50, 8.90) are populated. For reaction (b) see (1985DE17; Ep = 58 MeV; 10B*(0.72, 1.74)) and (1984AJ01). See also (1986VDZY) and (1986GO28, 1986ZH03, 1987GA08, 1987KW01; theor.).
| 50. 12C(d, α)10B | Qm = -1.3401 |
Alpha groups have been observed to most of 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 40 MeV: see (1979AJ01). 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). A study of the ms = 0 yield at Ed = 14.5 MeV (θ = 0°) leads to assignments of 3+, 2- and (3+, 4-) for 10B*(4.77, 5.11, 6.56). The population of the isospin-forbidden group to 10B*(1.74) [α2] has been studied with Ed up to 30 MeV: see 14N in (1986AJ01). See also (1984LOZZ).
| 51. 12C(α, 6Li)10B | Qm = -23.7118 |
Angular distributions have been reported at Eα = 42 and 46 MeV: see (1979AJ01). At Eα = 65 MeV, an investigation of the 6Li breakup shows that 10B*(0, 0.72, 2.16, 3.57, 4.77, 5.2, 5.9, 6.0) are involved: see (1984AJ01). See also (1987GA20).
| 52. 12C(7Li, 9Be)10B | Qm = -8.492 |
At E(7Li) = 78 MeV angular distributions have been measured to 10B*(0, 2.15) (1986GLZV; prelim.).
| 53. (a) 12C(12C, 14N)10B | Qm = -14.9144 |
| (b) 12C(14N, 16O)10B | Qm = -4.4505 |
Angular distributions (reaction (a)) involving 10B*(0, 0.7) have been studied at E(12C) = 49.0 to 75.5 and 93.8 MeV. Angular distributions (reaction (b)) involving 10B*(0, 0.72, 2.15, 3.59) have been measured at E(14N) = 53 MeV and 78.8 MeV (not to 10B*(3.59)): see (1979AJ01, 1984AJ01) for references. See also (1986AR04, 1986CR1A, 1986MOZV).
| 54. 13C(p, α)10B | Qm = -4.0618 |
Angular distributions have been measured at Ep = 5.8 to 18 MeV and 43.7 and 50.5 MeV: see (1979AJ01). See also 14N in (1986AJ01) and (1985MAZG; theor.).
| 55. 14N(p, pα)10B | Qm = -11.6125 |
See (1986VDZY; Ep = 50 MeV; prelim.). See also (1986GO28; theor.).
| 56. 14N(d, 6Li)10B | Qm = -10.137 |
At Ed = 80 MeV angular distributions are reported to 10B*(0, 0.72, 2.15, 3.59, 4.8, 6.04, 7.05, 8.68): see (1984AJ01).
| 57. 16O(9Be, 15N)10B | Qm = -5.542 |
See (1985WI18).