Nuclear level densities of 64,66Zn from the analysis of neutron evaporation spectra

The neutron spectra from the reactions $^{63}$Cu(d,n)$^{64}$Zn and $^{65}$Cu(d,n)$^{66}$Zn have been measured using deuteron energies 6 and 7.5 MeV. These results have been compared with the cross sections obtained from the Hauser-Feshbach calculations using the EMPIRE code. Different level density models have been tested, which include three phenomenological (Gilbert-Cameron model, generalized superfluid model and enhanced generalized superfluid model) and one microscopic (Hartree-Fock-Bogoliubov microscopic model), and it was found that by using the Gilbert-Cameron model the calculated cross section closely agrees with the experimental results. We have also studied the non-compound component of the reactions by analyzing the neutron angular distributions. The non-compound component has been shown to be forward-peaked and is more pronounced at high neutron emission energies. We have also observed a slight enhancement of the non-compound contribution as the incident deuteron energy is increased.