Elsevier

Nuclear Physics

Volume 70, Issue 3, August 1965, Pages 553-560
Nuclear Physics

A comparison of the C12(He3, p) and (He3, n) reactions leading to analogue states in N14 and O14

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Abstract

Angular distributions and excitation functions have been measured for the C12(He3, n)O14 (ground state) and the C12(He3, p)N14 (first excited state) reactions at energies between 6.5 and 11 MeV. Angular distributions of both protons and neutrons show strong forward peaking at all energies. At small angles the data can be fitted with the predictions of a simple plane-wave direct-interaction theory using a fixed value of r = 5.0 fm for the interaction radius. At larger angles the measured differential cross sections are greater than those predicted by the simple theory although they are generally much smaller than the 0° cross sections observed at the same energies. Excitation functions were obtained at a laboratory angle of 10° by the simultaneous measurement of the yields of neutrons and protons from the same target. A marked energy dependence was observed in each case. The ratio (dσn/dσp)10° was found to be nearly constant over the entire energy range. The ratio found was approximately two, which is the value to be expected if isobaric spin is conserved in the reaction and if Coulomb scattering and Coulomb energy effects (Q value differences), can be neglected.

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Work supported by the U.S. Atomic Energy Commission. This paper is a revised version of A.E.C. Report NYO-10034 which was issued February 5, 1962.

Present address: Swarthmore College.

††

Present address: Indian Institute of Technology, Kanpur, India.

†††

Present address: University of California, Los Angeles, calif.

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