Neutron and proton evaporation spectra from the ${}^6\mathrm{Li}+{}^{55}\mathrm{Mn}$ and $d+{}^{59}\mathrm{Co}$ reactions have been analyzed with the Hauser-Feshbach approach using different input models for nuclear level densities of ${}^{60}\mathrm{Ni}$ and ${}^{60}\mathrm{Co}$ nuclei. It has been found that models with a Fermi-gas like temperature dependence fail to reproduce particle spectra from both reactions simultaneously. We obtained the surprising result that the only way to describe our data is to assume the independence of the nuclear temperature on the excitation energy up to about the 20 MeV energy range.

• Received 2 July 2008

DOI:https://doi.org/10.1103/PhysRevC.79.031301