Study of the Fusion-Fission Process in the ${}^{35}Cl{+}^{24}Mg$ Reaction

Abstract

Fusion-fission and fully energy-damped binary processes of the ${}^{35}$Cl+${}^{24}$Mg reaction were investigated using particle-particle coincidence techniques at a ${}^{35}$Cl bombarding energy of E${}_{lab}$ $\approx$ 8 MeV/nucleon. Inclusive data were also taken in order to determine the partial wave distribution of the fusion process. The fragment-fragment correlation data show that the majority of events arises from a binary-decay process with a relatively large multiplicity of secondary light-charged particles emitted by the two primary excited fragments in the exit channel. No evidence is observed for ternary-breakup processes, as expected from the systematics recently established for incident energies below 15 MeV/nucleon and for a large number of reactions. The binary-process results are compared with predictions of statistical-model calculations. The calculations were performed using the Extended Hauser-Feshbach method, based on the available phase space at the scission point of the compound nucleus. This new method uses temperature-dependent level densities and its predictions are in good agreement with the presented experimental data, thus consistent with the fusion-fission origin of the binary fully-damped yields.

30 pages standard REVTeX file, 10 eps Figures; to be published at the European Physical Journal A - Hadrons and Nuclei