Insights into the low energy incomplete fusion

Abstract

In the present work, channel-by-channel excitation functions of different evaporation residues populated via complete and/or incomplete fusion in 12C + 169Tm system have been measured for an energy range Elab ≈ 53–90 MeV, using recoil-catcher activation technique followed by off-line γ -spectroscopy. Experimentally measured excitation functions have been analysed in the framework ofstatistical model code PACE. To probe the effect of entrance-channel parameters on the onset and strength of incomplete fusion, relative contributions of complete and incomplete fusion have been deduced from the analysis of experimentally measured excitation functions. The percentage fraction of incomplete fusion deduced from the analysis of excitation functions has been studied in terms of incident energy, entrance-channel mass-asymmetry, ground state alpha-Q-value, neutron skin thickness of target nuclei, and nuclear potential parameters. It has been found that incomplete fusion start competing with complete fusion even at slightly above barrier energies where complete fusion is assumed to the sole contributor. The probability of incomplete fusion increases with incident energy, entrance channel mass-asymmetry, large negative ground state alpha-Q-value, neutron skin thickness, and nuclear potential parameters for individual projectiles.