Investigation of incomplete fusion dynamics at energy 4–8 MeV/nucleon

Abstract The recoil-catcher activation technique followed by the offline γ -ray spectroscopy has been adopted for the excitation function measurement of residues populated in 12,13 C induced reactions with 175 Lu target at lower projectile energies ≈ 4 – 8 MeV / nucleon . The independent cross-sections for some of the populated residues have been estimated by subtracting the contributions of higher charge precursor isobars from the measured cumulative cross-sections. The measured excitation functions are compared with theoretical predictions based on statistical model code PACE-4. This comparison reveals that complete fusion process solely contributes in the formation of xn-pxn channels and an enhancement in the measured cross-sections of α -emitting channels from the theoretical predictions may be attributed to the incomplete fusion process. The incomplete fusion probability is found to be higher in case of C 12 than for a one neutron rich projectile C 13 throughout the incident energy region. Present findings obtained for 12,13 C + 175 Lu systems have been compared with informations extracted from previously studied systems and projectile structure is found to strongly affect the incomplete fusion dynamics in terms of projectile α - Q -value along with projectile-target mass-asymmetry. Moreover, it may be pointed out that Morgenstern's mass-asymmetry systematic is probably the projectile structure dependent systematic. A substantial contribution to incomplete fusion coming from collision trajectories with l ≤ l crit is also observed, contrary to the SUMRULE model assumptions.