Complete and incomplete fusion reactions in theO+16Tm169system: Excitation functions and recoil range distributions

Abstract

With the view to study complete and incomplete fusion in heavy ion induced reactions, experiments have been carried out for measuring excitation functions for several reactions in the system $^{16}\mathrm{O}+^{169}\mathrm{Tm}$ at energies near the Coulomb barrier to well above it, using an activation technique. The measured excitation functions have been compared with those calculated theoretically using three different computer codes viz., ALICE-91, CASCADE and PACE2. The enhancement of experimentally measured cross sections for alpha emission channels over their theoretical prediction has been attributed to the fact that these residues are formed not only by complete fusion but also through incomplete fusion. In order to separate out the relative contributions of complete and incomplete fusion, the recoil range distributions of eight residues produced in the interaction of $^{16}\mathrm{O}$ with $^{169}\mathrm{Tm}$ at $\ensuremath{\approx}87\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$ have been measured. The recoil range distributions indicate significant contributions from incomplete fusion at $\ensuremath{\approx}87\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$ for some of the channels.