Spin-distribution measurement: A sensitive probe for incomplete fusion dynamics

Abstract

Spin distributions of various reaction products populated via complete and/or incomplete fusion of $^{16}\mathrm{O}$ with $^{169}\mathrm{Tm}$ have been measured at projectile energy $\ensuremath{\approx}5.6$ MeV/nucleon. Particle ($Z=1,2$) \ensuremath{\gamma}-coincidences have been employed to achieve the information about involved reaction modes on the basis of their entry state spin populations. The experimentally measured spin distributions for incomplete fusion products have been found to be distinctly different than those observed for complete fusion products. The driving input angular momenta associated with incomplete fusion products have been found to be relatively higher than complete fusion products, and increases with direct \ensuremath{\alpha}-multiplicity. It has also been observed that incomplete fusion products are less fed and/or the population of lower spin states are strongly hindered, while complete fusion products indicating strong feeding over a broad spin range.