Elsevier

Nuclear Physics

Volume 13, Issue 1, 1 October 1959, Pages 1-31
Nuclear Physics

Mechanisms for the O16(He3, He4)O15 reaction

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Abstract

Excitation curves for the O16(He3α)O15 and O16(He3p)F18 reactions show pronounced resonance structure in the He3 energy range from 2.0 to 3.0 MeV. It has been demonstrated that the energy dependence of the alpha particle angular distribution coefficients in the region of the strongest resonance structure requires interference between compound states with angular momentum 12 and 52 and like parity at excitations of 10.44 and 10.46 MeV in Ne19. Total and partial widths for both resonances have been extracted from the data; the He3 partial width of the 12 resonance is 67% of the single particle limit. In fitting the experimental data it has been necessary to include the energy dependence of the resonance parameters. Alpha particle angular distributions measured between resonances, in contrast, indicate a direct interaction mechanism for the reaction. A small, relatively constant direct interaction reaction amplitude and a markedly energy dependent compound system amplitude which is dominant in the vicinity of compound system resonances are suggested by these measurements. An upper limit of 0.8 μb has been established for the He3 capture cross section proceeding through the 12 resonance.

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