Statistical model analysis of cross sections of (n, t) and (n,He3) reactions induced by 14.6 MeV neutrons on target nuclei withA=27 to 59

Total cross sections of 14.6 MeV neutron induced reactions ($n, n^{\prime }$), ($n, p$), ($n, d$), ($n, \alpha$), ($n, t$), and ($n$, ${}_{}{}^3{}_{}{}^{}\mathrm{He}$), on the target nuclei in the mass region $A=27\mathrm{} \mathrm{to} 59$, have been calculated (for the first stage decay) by the Hauser-Feshbach method using a unified set of optical model parameters. The strong reaction channels are described well by the calculations. The ($n, t$) reaction on target nuclei in the ($2s, 1d$) shell seems to proceed predominantly via statistical processes; for heavier nuclei nonstatistical contributions become important. In the case of ($n$, ${}_{}{}^3{}_{}{}^{}\mathrm{He}$) reactions, the few experimentally measured cross sections are much higher than those obtained by theoretical calculations.