C12(He3, n)O14Reaction at 19, 22, and 25 MeV

Abstract

With the aid of neutron detectors having thresholds at 1, 5, and 12 MeV, the angular distributions and average cross sections of the ${\mathrm{C}}^{12}({\mathrm{He}}^3, n){\mathrm{O}}^{14}$ reaction have been investigated at 19-, 22-, and 25-MeV ${\mathrm{He}}^3$ energy. All angular distributions show strong forward peaking suggestive of direct interactions. One case, involving only transitions to the ground state, exhibits a type of structure similar to that of protons from the ${\mathrm{C}}^{12}({\mathrm{He}}^3, p){\mathrm{N}}^{14}$ reaction to the first excited state, the $T=1\mathrm{}$ analog of the ${\mathrm{O}}^{14}$ ground state. However, the momentum transfer at a reasonable radius is such that plane-wave theory would predict a minimum at 0° instead of the strong forward peak observed.