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

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.