A study of 3He capture in light nuclei

doi:10.1016/0375-9474(83)90091-X

Nuclear Physics A

Volume 395, Issue 1, 7 March 1983, Pages 119-151

https://doi.org/10.1016/0375-9474(83)90091-X Get rights and content

Abstract

Excitation functions at θ = 90° have been measured for $^{16} O (^{3} He, γ_{0−2, 3−5, 6})^{19} Ne$ , $^{15} N (^{3} He, γ_{0, 1−4})^{18} F,^{14} N (^{3} He, γ_{0, 1,2,3})^{17} F$ , and $^{20} Ne (^{3} He, γ_{0 + 1})^{23} Mg$ , in the range E_{3_He = 3–19 MeV}. The first reaction has also been studied at θ = 40°. Excitation functions at 90° have also been measured for $^{40} Ca (^{3} He, γ_{0−2})^{43} Ti for E_{3_{He}= 4–17MeV}$ and $^{4} He (^{3} He, γ_{0 + 1})^{7} Be$ for E₃_He = 19–26 MeV. Angular distributions have been measured for the first four reactions.

For the most excitation functions, a broad peak is observed, several MeV wide, centred at about E_x≈ 20 MeV. Superimposed on this, in some cases, are narrower peaks, with width ≈ 1 MeV. Energies and widths have been extracted for all resonances.

Cluster-model calculations have been carried out, using methods similar to those which have proved successful for low-lying states in A= 18–19 nuclei. No satisfactory correspondence with the present results was found. The shell model has been used to calculate Γ_{3_He} and Γ_γ for 1ħω excitations in the final nuclei. These generally show good agreement with the trends of the experimental data. The results are consistent with the excitation of the giant dipole resonance in ³He capture, but much more weakly than in proton capture.

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  - γ-ray mixing ratios σ,
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  - lifetimes γ_m or widths Λ,
- •
  - neutron, proton, or α-particle resonances,
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Figures are presented of the level schemes of all nuclei and, for each A-chain, an overview of the relative energies of the ground states and lowest analogue states of all nuclei in the chain.
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^†: Present address : Physics Department, University of British Columbia, Vancouver, BC, Canada V6T 2A6.

^††: Present address: Nuclear Physics Laboratory, Keble Road, Oxford OX1 3RH, England.

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A study of 3He capture in light nuclei

Abstract

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A study of ³He capture in light nuclei