Pre-equilibrium and equilibrium emission of neutrons inCd114(α,xn)reactions

Abstract

The ${}^{114}\mathrm{Cd}(\alpha ,\mathit{xn})$ reaction has been studied for $E_{\alpha }=35\text{−}55\mathrm{MeV}$ following neutron emission and $\gamma$-ray deexcitation. Excitation functions of various $(\alpha ,\mathit{xn})$ channels measured from $\gamma$-ray yields have been compared with theoretical calculations based on ALICE-91 and CASCADE codes. Neutron energy spectra were generated from $\gamma$-gated neutron time of flight spectra. Neutron energy spectra corresponding to $(\alpha ,3n)$ and $(\alpha ,4n)$ reactions at $E_{\alpha }=50\mathrm{MeV}$ have been theoretically reproduced taking into account the contributions of equilibrated source with level density parameter $a=A/11$, along with the contributions from the pre-equilbrium process.