Incomplete Fusion In O-16+Tb-159

In heavy-ion induced reactions, incomplete fusion (ICF) has been found to be a process of greater importance and of distinct nature even at slightly above the barrier energies where complete fusion (CF) is supposed to be dominant. However, the studies are limited to a few projectile target combinations only. To confirm the distinctly different decay patterns observed in case of CF and ICF residues, and to understand the role of high l-values in the onset of ICF, a particle-gamma-coincidence technique has been employed to measure spin-distributions and feeding intensity profiles of CF and ICF residues populated via xn/pxn/alpha xn-channels in O-16+Tb-159 interactions at E-lab approximate to 83.5 +/- 1.5, 88.5 +/- 1.5, 93.5 +/- 1.5 and 97.6 +/- 1.4 MeV. The Gamma Detector Array and the Charged Particles Detector Array have been used to detect prompt gamma-rays in coincidence with charged particles (p and alpha). CF-alpha and ICF-alpha channels have been identified from backward (B)- and forward (F)-alpha-gated-gamma-spectra, respectively. Reaction dependent decay patterns (thus, the feeding intensity profiles) have been observed in different alpha emitting channels. The CF channels are found to be widely populated and strongly fed over a broad spin range. In case of ICF-alpha channels, narrow range feeding was observed only for high-spin states or the low spin states were not populated. The mean l-values involved in the production of ICF-alpha xn-channels are found to be higher than those involved in the production of CF-alpha xn-channels associated with fusion-evaporation reactions. (C) 2015 Elsevier B.V. All rights reserved.