11B(3He, d)12C spectroscopic factors

doi:10.1016/0375-9474(69)90050-5

Nuclear Physics A

Volume 136, Issue 1, 13 October 1969, Pages 229-240

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Abstract

Particle-identification techniques have been used to study the ¹¹B(³He, d)¹²C reaction. Angular distributions have been measured for incident ³He energies of 10, 12 and 18 MeV for residual states in ¹²C up to 16.11 MeV excitation. Elastic scattering of ³He by ¹¹B has been measured at the same energies in order to extract optical-model parameters. The angular distributions have been analysed using DWBA calculations in order to obtain absolute spectroscopic factors. Zero-range DWBA was used with and without radial cut-off, and approximate finite-range DWBA calculations were also performed. Comparisons of the spectroscopic factors extracted using ¹¹B(³He, d)¹²C and ¹¹B(d, n)¹²C are given.

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Inelastic scattering in the 6Li + 9Be system leading to unbound excited states of either nucleus
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Complete angular distributions for elastic scattering and inelastic scattering to the first excited state (3⁺, 2.186 MeV) of ⁶Li and the second excited state ( $52^{−}$ , 2.43 MeV) of ⁹Be in the system $^{6} Li +^{9} Be$ are presented for energies E_cm. = 7, 10 and 12 MeV. The inelastic-scattering cross sections for these particle-unbound excited states are measured by detecting the corresponding recoil nucleus. The wide range of the inelastic-scattering angular distributions (30° ≲ θ_c.m. ≲ 170°) is achieved by interchanging appropriately the role of the projectile and target nuclei. Excitation functions for the studied elastic and inelastic scattering covering the energy range 4 ≲ E_c.m. ≲ 12 MeV are reported also. In the analysis, the channels with the nucleus ⁶Li excited and with the nucleus ⁹Be excited are coupled to the ground states in one coupled-channels calculation, using an optical potential with a real double-folded part and a Woods-Saxon imaginary part. The inelastic-scattering data are fitted using deformation lengths that exhibit some energy dependence and that approach at lower c.m. energies more closely those deduced from the B(E2) values. Compound-nucleus contributions to the observed cross sections are calculated using the Hauser-Feshbach formalism, but are found to be rather small in this system, except at backward scattering angles. In addition, the effect of elastic and inelastic triton transfers is examined by performing finite-range DWBA calculations and such contributions are found also to be unimportant.
Energy levels of light nuclei A = 11-12
1980, Nuclear Physics, Section A
Coupled-channels analysis of energy-dependent isospin violation in the 12C(d, α)10B(1.74 MeV, T = 1) reaction
1978, Nuclear Physics, Section A
We have studied the isospin non-conserving ¹²C(d, α)¹⁰B(1.74 MeV, 0⁺, T= 1) reaction at several incident energies of 9 ≦ E_d ≦ 16 MeV in terms of a coupled-channels method. The reaction processes involved in the present analysis are the successive single-nucleon pick-up processes as well as the inelastic scattering of deuterons from ¹²C. It is assumed that the isospin violation should occur in the intermediate mirror cluster states of ³He + ¹¹B and t + ¹¹C, due to the Coulomb interaction. The calculation reproduces fairly well the observed features of the reaction, i.e. the decreasing cross section with increasing incident energy, and the variation of the angular distribution. We also note that the calculation shows the energy-dependent localization of isospin violation in the angular momentum space, i.e. a specifically narrow localization at the lower incident energies studied and its broadening at the higher energies. This fact is associated with the variation of the angular distribution from a forward-backward symmetry at the lower incident energies to a forward peak at the higher energies.
Isospin mixing in 12C
1976, Physics Letters B
Gamma-ray decays of the 12.71 and 16.11 MeV states of ¹²C are investigated in a coincidence study of the ¹⁰B(τ, pγ) reaction, and using the 163 keV ¹¹B(p, γ) resonance. This information together with existing data on M1 transitions and stripping and pickup spectroscopic factors is used to determine the isospin mixing between the 12.71 and 15.11 MeV levels. A charge dependent mixing matrix element of 110 ± 30 keV is deduced.
Multistep contributions to 11B(h, α)10B from 8.0 to 12.0 MeV
1973, Physics Letters B
Various improvements to the usual distorted-wave Born approximation description of direct reactions on light nuclei are investigated, using ¹¹B(h, α)¹⁰B as an example, and including finite-range effects, compound nuclear contributions, and deformation as well as inelastic process in the entrance and exit channels. It is found that only the inelastic processes and deformation play an important role, and that their inclusion, via the coupled-channel Born approximation, very satisfactorily describes the available data in shape and magnitude.
A study of the 11B(3He, p)13C reaction at 12, 10, 8, 6 and 4 MeV
1973, Nuclear Physics, Section A
Angular distributions for eight proton groups corresponding to states in ¹³C have been measured at incident ³He energies of 4, 6, 8, 10 and 12 MeV. These states are p₀(ground state), P₁(3.09), p₁(3.68), p₃(3.85), p₄(6.86), p₇(7.68), pio(9.50) and p₁₁ (9.90). The angular distributions have been fitted with DWBA analyses using a zero-range approximation. No radial cut-offs were used. In general the data are reasonably well fit at incident energies of 10 and 12 MeV.

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Nuclear Physics A

Abstract

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Cited by (28)

Inelastic scattering in the <sup>6</sup>Li + <sup>9</sup>Be system leading to unbound excited states of either nucleus

Energy levels of light nuclei A = 11-12

Coupled-channels analysis of energy-dependent isospin violation in the <sup>12</sup>C(d, α)<sup>10</sup>B(1.74 MeV, T = 1) reaction

Isospin mixing in <sup>12</sup>C

Multistep contributions to <sup>11</sup>B(h, α)<sup>10</sup>B from 8.0 to 12.0 MeV

A study of the <sup>11</sup>B(<sup>3</sup>He, p)<sup>13</sup>C reaction at 12, 10, 8, 6 and 4 MeV