Level densities in hot ${}^{112}\mathrm{Sn},$ ${}^{131}\mathrm{La},$ and ${}^{134}\mathrm{Ce}$ nuclei from giant dipole resonance γ decay

We have measured high-energy γ rays up to $E_{\gamma }=23\mathrm{}\mathrm{MeV}$ from three highly excited medium mass nuclei, ${}^{112}\mathrm{Sn},$ ${}^{131}\mathrm{La},$ and ${}^{134}\mathrm{Ce}.$ The absolute ${}^{131}\mathrm{La}$ γ-ray multiplicity has been compared to statistical model calculation without any normalization. We have found that level density prescriptions of Pülhofer and Ignatyuk-Smirenkin-Tishin–Reisdorf fit the data with giant dipole resonance centroid energy and width taken from systematics, whereas the experimental level density parameters of Budtz-Jørgensen and Knitter fail to fit the data.