(See Energy Level Diagrams for 11B)
Complex reactions involving 11B:(1978VO10, 1979AL22, 1979BO22, 1979GE1A, 1979SA27, 1979SA26, 1979SC1D, 1979ST1D, 1980GR10, 1980MI01, 1980MO28, 1980RI06, 1980WI1L, 1981BH02, 1981CI03, 1981ME13, 1981MO20, 1981TA16, 1981TA22, 1982BI1C, 1982FU04, 1982JA1C, 1982LU01, 1982LY1A, 1982MO1K, 1982WU1B, 1983CH23, 1983EN04, 1983FU04, 1983HA1C, 1983OL1A, 1983SA06, 1983SC1L, 1983SI1A, 1983SO08, 1983WA1F, 1983WI1A, 1984GO03, 1984GR08, 1984HI1A, 1984VO06).
Pion and kaon capture and reactions (See also reactions 21, 32 and 50.):(1979AL1J, 1979AL21, 1979BA16, 1979BU1C, 1979KI1G, 1979PE1D, 1979PI1C, 1979ZI05, 1980DE11, 1980GR1G, 1980LE02, 1980SO05, 1980ZI1B, 1981BE63, 1981FE2A, 1981FR17, 1981GE1B, 1981RO1L, 1981RO1R, 1981TH1B, 1981ZI01, 1982DE1K, 1982ER04, 1983AN1F, 1983BA71, 1983FE07, 1983GE12, 1983GE13, 1983MO1F, 1983RO07, 1983ZE1C).
Ground-state properties of 11B (See also reactions 31 and 32.):(1979AL26, 1979NI06, 1979SA27, 1980BA45, 1980FU1G, 1980HO14, 1981AV02, 1981BO1Y, 1981OL01, 1981SE06, 1982BA37, 1982BO01, 1982LO13, 1982NG01, 1983ANZQ, 1983BU07, 1983MI08, 1983VA31, 1984KU07, 1984MIZM).
Q = 40.65(26) mb [see (1980AJ01)],
B(E2; 3/2- → 1/2-) = 2.1 ± 0.4 e2 · fm4 (1980FE07).
Angular distributions have been measured for proton groups to states with Ex < 9.3 MeV at E(6Li) = 2.4 to 9.0 MeV: see (1980AJ01).
Table 11.7 (in PDF or PS) displays the thresholds and resonances observed in this reaction. (1981SE04) have measured thick-target yields (± 6%) for Eα = 4.385 to 5.1 MeV at a number of angles: a broad resonance is observed near Eα = 4.7 MeV. Thick-target yields have also been reported from threshold to 9.00 MeV (1979BA48).
The elastic scattering and the scattering to 7Li*(0.48) have been studied at many energies to Eα = 22.5 MeV. Recent measurements are reported by (1979ST25; α0; Eα = 1.36 - 3.20 MeV) and (1981WA1P; α0; Eα = 5.0 and 6.0 MeV). Observed resonances are displayed in Table 11.8 (in PDF or PS) here. Additional parameters are shown in Table 11.9 (in PDF or PS) of (1975AJ02). See also (1982WA23) and (1980BA2K; theor.).
Angular distributions have been measured at E(7Li) = 2.10 to 5.75 MeV. At E(7Li) = 79.6 MeV transitions are observed to several 11B states. 11Bg.s. is particularly strongly populated. See (1975AJ02) for references.
The 90° γ0 differential cross section has been measured for Ed = 0.5 to 11.9 MeV: see (1975AJ02). The behavior of the γ0, γ1 and γ2+3 total cross sections and of the angular distributions of these γ-rays indicate two resonances at Ed = 1.98 ± 0.05 and 3.12 ± 0.05 MeV with Γlab = 225 ± 50 and 320 ± 100 keV, corresponding to 11B*(17.43, 18.37). The higher resonance was not observable in the γ2 + γ3 cross section which was not measured beyond Ed = 2.5 MeV. The maximum γ0 cross section observed is 10.1 ± 3.5 μb at Ed ≈ 0.96 MeV. Resonant behavior is observed in the 90° γ0 cross section at Ed ≈ 3.4 and 9.65 MeV (11B*(18.6, 23.7)) in addition to a wide structure at 4.7 MeV (11B*(19.7)). The angular distributions of γ0 from 11B*(18.6, 23.7) are typical of E1 transitions. The (d, γ0) reaction appears to proceed via excitation of the T = 1/2 component of the giant dipole resonance in 11B.
The cross section follows the Gamow function for Ed = 70 to 110 keV. The fast-neutron and gamma yield rise smoothly to Ed = 1.8 MeV except for a possible "resonance" at Ed ≈ 0.94 MeV. The fast neutron yield then remains approximately constant to 3 MeV: see (1968AJ02) for references. The excitation functions for n0 → n4, and n to 10B*(5.1, 6.57) have been measured for Ed = 14 to 16 MeV: no strong fluctuations are observed: see (1975AJ02). Thick-target yields for γ-rays have been measured at Ed = 48 to 170 keV (1982CE02; also deduced astrophysical S-factors). Thick-target yields are also reported at Ed = 14.8, 18.0 and 23.0 MeV: see (1980AJ01). Polarization measurements have been carried out at Ed = 0.4 to 5.5 MeV [see (1975AJ02, 1980AJ01)] and at Ed-bar = 12.3 MeV (1981BR1E, 1983LIZW; VAP; n0, n1, n2). See also (1979GR2D; applied) and 10B in (1984AJ01).
Measurements of proton yields have been carried out at Ed up to 6.0 MeV for p0 and p1 [see (1975AJ02, 1980AJ01)] and at Ed-bar = 29 to 170 keV (1981CE04; thick target yield; σ(θ) at 150°; deduction of astrophysical S(θ, E)) and at Ed-bar = 1.4 to 2.5 MeV (1980DE45; p0, p1). The p0 and p1 yields show a resonance at Ed = 750 ± 15 keV [11B*(16.43), Γ ≈ 40 keV] and the p1 yield resonates at 1.85 MeV [11B*(17.33), Γc.m. ≈ 1.0 MeV] and 2.3 MeV [11B*(17.70), sharp]. See also (1975AJ02) and (1980DE45) for other possible structures. Polarization of the protons have been measured at Ed = 1 to 21 MeV [see (1975AJ02, 1980AJ01)] and at Ed-bar = 1.4 to 2.5 MeV (1980DE45; VAP; p0, p1) and 2.0 to 2.8 MeV (1984AN1R; p0, p1). See also 10Be in (1984AJ01) and (1984DE1W; theor.).
The yeild of α-particles (reaction (b)) has been measured for Ed = 0.3 to 14.43 MeV [see (1975AJ02, 1980AJ01)], at Ed-bar = 1.4 to 2.4 MeV (1980DE42, 1980DE43, 1980DE44; yields of α0, α1 and VAP) and 2.0 to 2.8 MeV (1984AN1R; α0, α1). The 0.75 MeV resonance, observed in reaction (a), is weakly populated in the α0 yield. See also 7Li in (1984AJ01).
The cross section for reaction (c) has been measured for Ed = 0.15 to 19 MeV: see (1968AJ02, 1975AJ02, 1980AJ01). Polarization measurements are reported at Ed-bar = 12 and 15 MeV [see (1980AJ01)] and at Ed-bar = 2.0 to 2.8 MeV (1984AN1R; t0). There is no clear evidence of resonance structure. See also 8Be in (1984AJ01).
Excitation functions for elastically scattered deuterons have been measured for Ed = 0.4 to 7.0 MeV and for 12.17 to 14.43 MeV (also d1, d2) [see (1975AJ02, 1980AJ01)] and at Ed-bar = 2.0 to 2.8 MeV (1982DE1P; also VAP). Polarization measurements have also been reported at Ed-bar = 6.3 to 15 MeV [see (1975AJ02, 1980AJ01)]. See also 9Be in (1984AJ01).
Angular distributions have been measured at Et = 1.1 to 1.7 MeV (n0, n1, n2, n6, n8, n9): see (1980AJ01).
Proton groups have been observed to a number of 11B states: see Table 11.9 (in PDF or PS). Angular distributions have been obtained at a number of energies in the range E(3He) = 1.0 to 14 MeV [see (1980AJ01)], at E(3He) = 13.0 to 14.2 MeV (1983PO13; p0), at E(3He) = 33 MeV (1983LE17; p0 → p3) and at E(3He) = 38 MeV (1982ZW02). It is suggested that the T = 1/2 strength is strongly fragmented (1982ZW02). See also (1983BI1P, 1983ZW1A).
At E(3He) = 13.6 MeV (1982HA06) find equal values for the polarization in this reaction, and the analyzing power in the 11B(p, 3He) reaction, showing no violation of time-reversal invariance. This is confirmed by (1983RO22) at E(3He) = 33 MeV. See also (1981SL03, 1984PO02), (1968AJ02) and 12C.
Angular distributions have been measured at a number of energies in the range Eα = 23.4 to 28.3 MeV [see (1980AJ01)] and at 30.1 MeV (1983VA1H; d0 → d3). The predominant L-transfers are L = 0, 2; 0; 0 for 11B*(0, 2.12, 5.02). The angular distribution to 11B*(4.44) is flat at Eα = 27 MeV. At Eα = 48 MeV, 11B*(16.44, 17.69, 18.0, 19.15) are not excited suggesting that these states are rather pure T = 3/2 states (1982ZW02): see Table 11.9 (in PDF or PS). See also (1983ZW1A).
Angular distributions have been determined for seven α-groups at E(6Li) = 3 to 4 MeV, and at 24 MeV to 11B*(0, 2.12) and to a number of unresolved levels with Ex ≤ 13.2 MeV: see (1968AJ02, 1975AJ02). For the breakup reactions see (1975AJ02). See also (1981OS1H).
The yield of γ0 has been measured at 90° for Ep = 0.6 to 6.3 MeV. Observed resonances are displayed in Table 11.10 (in PDF or PS). T = 3/2 assignments are made for the states at Ex = 12.56, 12.91, 14.33 and 15.32 MeV whose energies match those of the first four states of 11Be [compare with the T = 3/2 states reported in 9Be(3He, p)11B - Table 11.9 (in PDF or PS)]. See also Table 11.16 (in PDF or PS). Several known T = 1/2 states in 11B are not observed in this reaction: see Table 11.4 (in PDF or PS) (1970GO04, 1973GO09).
The scattering amplitude (bound) a = -0.2 ± 0.4 fm, σ(free) = 2.23 ± 0.06 b (1983KO17). The total scattering cross section is constant at 2.23 ± 0.06 b for En = 0.7 to 10 keV and then rises to 2.97 b at En = 127 keV.
Total cross-section measurements in the range En = 10 to 500 keV show a broad maximum near En = 0.23 MeV, also observed in the (n, α) cross section. At higher energies the total cross section shows broad maxima at En = 1.9, 2.8 and 4.3 MeV: see Table 11.11 (in PDF or PS). In the range En = 5.5 to 16 MeV σtot is constant at 1.5 b. See also (1983DA22).
Polarization measurements (0.075 to 2.2 MeV and 2.63 MeV) and measurements of differential cross sections (0.075 to 4.4 MeV) have been analyzed using R-matrix calculations: the results are shown in Table 11.12 (in PDF or PS). They are consistent with results from 10B(n, n'γ) and 7Li(α, n). See (1980AJ01) for references.
Elastic and inelastic cross sections have also been reported at En = 4 to 14.1 MeV: see (1980AJ01). The yield of 0.7 MeV γ-rays has been studied from threshold to En = 5.2 MeV: observed resonances are displayed in Table 11.11 (in PDF or PS). Inelastic scattering cross sections for formation of various 10B states have been measured at a number of energies in the range En = 1.45 to 14.8 MeV: see (1975AJ02). See also 10B in (1984AJ01), (1979CZ1A) and (1979GLZV; theor.).
The "recommended" value of the thermal isotropic absorption cross section is 3837 ± 9 b (1981MUZQ). The α0/α1 branching for thermal neutrons is (6.733 ± 0.008)% (1967DE15), (6.699 ± 0.012)% (1979ST03). At En = 2 and 24 keV the values are (7.05 ± 0.16)% and (7.13 ± 0.15)%, respectively (1979ST03).
The cross section for this reaction has been measured for En = 1.0 to 14.8 MeV [see (1975AJ02, 1980AJ01)] and at 0.025 eV to 25 keV (1980BO1V), 0.5 eV to 10 keV (1979CA1C, 1980CA1R) and 98 to 2200 keV (1979VI04). Evaluations of the cross-section data are presented by (1978LI32, 1981IN1B, 1982HA1Y). For observed resonances see Tables 11.11 (in PDF or PS) and 11.12 (in PDF or PS).
Parity violation has been studied using polarized thermal neutrons: a small left-right asymmetry had been reported in the (pol. n, α0) reaction (1979BO1E, 1981VE08). However, (1984VEZW) find ap < 8 × 10-6 and < 1.5 × 10-6, respectively for the transitions to 7Li*(0, 0.48). See also 7Li in (1984AJ01), (1979BO1Q, 1980CZ1A) and (1977WA1B).
Angular distributions have been obtained at Ep = 168 to 186 MeV [see (1980AJ01)] and at 154.5 MeV (1981SJ02; to 11B*(0, 2.12, 4.44; also Ay), 320, 410, 483 and 605 MeV (1980DI02, 1981CO1L; to 11B*(0, 2.12)) and 800 MeV (1981NAZY, 1982NA1K; to 11B*(0, 2.12, 4.44, 5.02, 6.74 + 6.79, 7.29)). At Ep = 200 MeV the relative yields to 11B*(0, 2.12, 4.44, 5.02, 6.74 + 6.79, 7.29, 8.0, 8.56, 8.92, 9.19 + 9.28) have been measured: they are similar to the relative yields in the (d, p) reaction except that 11B*(8.93, 9.19 + 9.27) are much less strongly excited in the (p, π+) reaction (1980SO05). (1979MA38, 1979MA39) have measured the cross section for π+ production near threshold. See also (1979ME2A, 1980AJ01, 1981AU1C, 1982CO1J, 1982HO1C, 1982LE1L, 1982WA1G).
Reported proton groups are displayed in Table 11.14 (in PDF or PS) of (1980AJ01). Angular distributions have been studied at many energies in the range Ed = 0.17 to 28 MeV [see (1968AJ02, 1975AJ02, 1980AJ01)]. See also (1983HA1Q). The lowest five levels are formed by ln = 1 except for 11B*(2.12) which appears to involve a spin-flip process. They are presumed to comprise the set 3/2-, 1/2-, 5/2-, 3/2-, 7/2- expected as the lowest p7 levels (a/K ≈ 4.0). 11B*(9.19, 9.27) [Jπ = 7/2+, 5/2+] show strong ln = 0 stripping and are ascribed to capture of a 2s neutron by 10B: see (1968AJ02) for a listing of all the relevant references. Studies of pγ correlations are discussed in reaction 14 of (1968AJ02) and displayed in Table 11.5 (in PDF or PS) of this paper. See also 12C and (1978CO1D, 1980BO1T, 1981CE04) and (1982GO05; theor.).
Angular distributions have been measured at Eα = 56 MeV for the ground-state transitions in this, and in the analog (α, t) reactions: the average ratio of the (α, 3He) to the (α, t) differential cross sections is 1.2 ± 0.1: see (1975AJ02).
At E(7Li) = 24 MeV angular distributions are reported to 11B*(0, 6.74, 8.92). 11B*(4.44, 5.02) are also populated. The (7Li, 6He) reaction [see reaction 15 in 11C] has also been studied: see (1980AJ01).
The total reaction cross section for 9Be + 10B has been studied for E(10B) = 2.2 to 10.4 MeV: at low energies there is evidence for this neutron transfer reaction with the excitation of 11B*(8.92, 9.19) (1979CH22).
11Be decays to many states of 11B: see Table 11.13 (in PDF or PS) for the observed β- and γ-transitions (1982MI08). 11B*(9.88) decays via α-emission to 7Li*(0, 0.48) with branching ratios (87.4 ± 1.2)% and (12.6 ± 1.2)%, respectively (1981AL03). A study of the βν angular correlation in the first-forbidden decay of 11Be to the 1/2- state 11B*(2.12) has been performed: the β-transition is dominated by rank-0 matrix elements and is of interest as a test of meson-exchange effects (1982WA18). See also (1980RI06; theor.).
The giant dipole resonance is shown to consist mainly of T = 1/2 states in the lower-energy region and of T = 3/2 states in the higher energy region by observing the decay to states in 10B and 10Be (reactions (a) and (b)). Absolute measurements of the 11B(γ, all n) cross section have been carried out from threshold to 35 MeV: the cross section exhibits a main peak at Eγ = 25 to 28 MeV and weak shoulders at 13 and 16 MeV. The integrated cross section to 35 MeV is 69.1 ± 0.8 MeV · mb: see (1980AJ01). (1979KA35) report the transition to 10B*(1.74). For other structures reported in the (γ, n) and (γ, p) cross sections see (1975AJ02). The (γ, d0) cross section peaks at ≈ 19 MeV, lower than it would if T = 3/2 states were involved. The yield of 3.37 MeV γ-rays (from 10Be*(3.37), reaction (b)) has been measured for Ebs = 100 to 800 MeV.
Magnetic elastic scattering at θ = 180° shows strong M3 effects: the derived ratio of static M3/M1, 2.9 ± 0.2 fm2, suggests a jj-coupling scheme for 11Bg.s.. The quadrupole contribution to the elastic form factor is best accounted for by the undeformed shell model, Q = 3.72 (± 20%) fm2, r(rms) = 2.42 fm. [From muonic X-rays < r2 > 1/2 = 2.47 ± 0.04 fm.] See (1980AJ01) for references. The excitation of 11B*(2.1, 4.4, 5.0, 8.6, 8.9) has been studied by (1975KA02: Ee = 52 to 90 MeV). The giant-resonance region, centered at ≈ 18 MeV, is characterized by a lack of prominent features except for a pronounced peak at Ex = 13.0 ± 0.1 MeV (mixed M1 - E2) and a broad transverse group at Ex = 15.5 MeV (1975KA02). At Ee = 121, 186 and 250 MeV form factors (and B(Eλ)↑) are obtained for 11B*(4.4, 6.7, 8.5, 8.9, 13.00 ± 0.15) and the excitation of 11B*(14.50 ± 0.15, 16.7 ± 0.2) is also reported (1979PO1B).
The proton matter distribution in 11Bg.s. has a radius of 2.368 ± 0.021 fm, assuming that for 12C to be 2.44 fm. The result is not sensitive to the details of the optical-model calculations (1980BA45; Eπ+ = 38.6 and 47.7 MeV). See also the "General" section here.
Angular distributions have been reported for En = 4 to 14.1 MeV [see (1980AJ01)] and at 2.6 to 8.0 MeV (1980WH01; n0), 4.86 to 7.55 MeV (1983KO03; n0, n1 and, at the higher energies, n2, n3) and at 8 to 14 MeV (1983DA22). See also 12B, and (1979GLZV, 1983KO1F; theor.).
Observed proton groups are displayed in Table 11.15 (in PDF or PS). Angular distributions have been measured for Ep = 6 to 185 MeV [see (1980AJ01)] and at 1 GeV (1979AL26). See also (1980FA07). The analysis of the 3/2- → 1/2- transition [11B*(0 → 2.12) at Epol. p = 32 MeV shows less spin-flip than predicted by DWBA (1981CO08). See also 12C, (1981HO13) and (1979RO1B, 1980KO1V; theor.).
The elastic scattering has been studied at Ed = 5.5 MeV and 11.8 MeV: see (1980AJ01).
The elastic scattering has been studied at Et = 1.8 and 2.1 MeV: see (1980AJ01).
The elastic scattering has been studied at E(3He) = 8 to 74 MeV: see (1975AJ02, 1980AJ01). At E(3He) = 17.5 and 40 MeV angular distributions have also been studied for the 3He ions to 11B*(2.12, 4.44, 5.02, 6.74) (1977SH09). T = 3/2 states observed in this reaction are displayed in Table 11.16 (in PDF or PS). There is a weak indication also of a state at Ex = 14.51 MeV: see (1975AJ02).
The elastic scattering has been studied at E(11B) = 18.8 to 34.1 MeV and at E(12C) = 15 to 24 MeV and at 87 MeV [see (1980AJ01)] as well as at E(11B) = 25, 40 and 50 MeV (1982MA20) and 28 MeV (1983SR01). The population of 11B*(2.12, 4.44, 6.79) and of 12C*(0, 4.43) are also reported. For yield and fusion studies see (1979FR05, 1981MA18, 1982MA20, 1983MA53, 1984MAZZ) for reaction (a) and (1983DA20) for reaction (b). See also (1982FR1T, 1983BI13, 1983DU13) and (1978DZ1A, 1979IS07, 1979ZE1B, 1981YO05, 1982HA42; theor.).
The elastic scattering in reaction (a) has been studied at E(16O) = 14.5 to 60 MeV and at E(11B) = 115 MeV [see (1975AJ02, 1980AJ01)] as well as at E(11B) = 41.6 and 49.5 MeV (1980PA01). A study of the elastic scattering in reaction (b) is reported at E(11B) = 115 MeV (1980PR09). See also (1983GO13; theor.).
The elastic angular distribution has been obtained at E(11B) = 115 MeV (1981GO11).
The elastic scattering angular distributions have been studied at E(11B) = 79.6 MeV (1982FU09).
The γ-decay of 11B*(2.12) has been observed (1981GI08).
The fraction of transitions to the ground and to excited states of 11B (and to 11C states reached in the (γ, n) reaction) has been measured at Ebs = 21.7 to 42 MeV: the ground state is predominantly populated [see (1980AJ01) and (1980IS1F)]. The population of analog states in the (γ, n) and (γ, p) reactions are similar: see 11C. Differential cross sections for populating several states of 11B have been measured at Eγ = 21.7 → 31 MeV (1980IS1F) and at 60, 80 and 100 MeV: see (1980AJ01). The cross section for reaction (b) has been measured for Ee = 21, 25, 35, 45 and 55 MeV. The production of 11B in astrophysical sites with large densities of high-energy electrons is discussed by (1983HO15). See also 12C, (1979KI04), (1980GO13), (1982SC1E; astrophys.) and (1981BO14, 1982LO08, 1983OR03; theor.).
At Eπ+ = 100 MeV [and 129.7 to 199.8 MeV (1981ZI01)] the reaction proceeds primarily to 11Bg.s.. At Eπ = 200 MeV the ratios for σn/σp for the first excited states in 11C/11B are 1.4 ± 0.2 for π- and 1/1.8 ± 0.2 for π+. At Eπ+ = 60 to 300 MeV 11B*(4.44) [Jπ = 5/2-] is strongly populated, as is the analog state in the mirror reaction. See (1980AJ01) for references. See also reaction 21 in 11C, 12C, (1983HUZZ, 1983MO1F) and (1982CH13; theor.). For the reaction 12C(π-, n)11B see (1983CE04).
At Ep = 98.7 MeV well-resolved groups are observed to 11B*(0, 2.12, 4.44, 5.02, 6.79). DWIA calculations lead to relative spectroscopic factors of 2.0, 0.37, 0.15, 1.08, 0.25 for these states [normalized to 2.0 for 11Bg.s.; overlap calculation]. No evidence is seen for the formation of giant resonances as the intermediate step in multistep reaction processes to 11B*(4.44, 6.74) (1979DE35). For the earlier work see (1975AJ02, 1980AJ01). See also (1983CH1B) and (1981AM01, 1983IK03; theor.).
Angular distributions of 3He ions have been measured for Ed = 20 to 80 MeV: see (1975AJ02, 1980AJ01). reported C2S for 11Bg.s. are 3.22 or 4.42 depending on the choice of parameters (1978CO13; Ed = 29 MeV; see also (d, t) results - reaction 24 in 11C) while (1975MA41; Ed = 52 MeV) find 2.98, 0.69, 0.31 for 11B*(0, 2.12, 5.02). For a polarization study see (1981MA14). See also 14N in (1986AJ01) and (1982ST1A; theor.).
Angular distributions have been measured for Et = 1 to 3.4, 10.1 and 13 MeV: see (1975AJ02).
At Eα = 65 MeV, 11B*(0, 2.12, 6.74 + 6.79) are strongly populated (1978SA26).
Angular distributions involving the ground-state transitions have been measured at E(12C) = 93.8 MeV (1979FU04) and 114 MeV (1974AN36). For yield measurements see (1980CO10). See also (1981CH1R) and (1981XU1A; theor.).
At E(19F) = 40, 60 and 68.8 MeV angular distributions involving 11B*(0, 2.12) and 20Ne*(0, 1.63) have been measured: see (1980AJ01).
At Ep = 50.5 MeV, in addition to 11B*(0, 2.12, 4.44, 5.02, 6.74, 8.92), a state is observed at Ex = 12.94 ± 0.05 MeV, Γ = 350 ± 50 keV. Comparison of the angular distributions of the 3He and of the tritons [in the analog reaction] at Ep = 43.7 and 50.5 MeV lead to the assignments Jπ = 1/2-, T = 3/2 for this state and for 11C*(12.50): the strong proton and the weak α-decay are consistent with this assignment: see Table 11.16 (in PDF or PS). Angular distributions have been measured at Ep = 26.9 to 49.6 MeV, involving the states above except for 11B*(8.92) [see (1975AJ02, 1980AJ01)] and at Epol. p = 65 MeV (1982KA01; to 11B*(0, 2.12); also analyzing power). See also 14N in (1986AJ01).
Angular distributions have been measured for En = 4.9 to 18.8 MeV [see (1975AJ02, 1980AJ01)] and at En = 12.2, 14.1 and 18 MeV (1978BU28; α0). At En = 14.1 and 15.7 MeV various states of 11B with 8.9 < Ex < 14.5 MeV appear to be involved in the sequential decay to 7Li. Angular correlation results are consistent with J = 7/2 and 5/2 for 11B*(9.19, 9.27) respectively: see (1975AJ02).
See (1983OS08; theor.).