Incomplete fusion analysis of $^{7}$Li-induced reaction on $^{93}$Nb within 3-6.5 MeV/nucleon

Abstract

Background: It is understood from the recent experimental studies that prompt/resonant breakup, and transfer followed by breakup in the weakly bound 6,7 Li-induced reactions play a significant role in the complete-incomplete fusion (CF-ICF), suppression/enhancement in the fusion cross section around the Coulomb barrier.Purpose: Investigation of ICF over CF by measuring cross sections of the populated residues, produced via different channels in the 7 Li-induced reaction on nat Nb target within 3-6.5 MeV/nucleon energy region.Method: The 7 Li beam was allowed to hit the self-supporting 93 Nb targets, backed by the aluminium (Al) foil alternately, within 3-6.5 MeV/nucleon energy. Populated residues were identified by offline γ-ray spectrometry. Measured excitation functions of different channels were compared with different equilibrium (EQ) and preequilibrium (PEQ) models. Result:The enhancement in cross sections in the proton (∼ 20-30 MeV) and α-emitting channels, which may be ascribed to ICF, was observed in the measured energy range when compared to the Hauser-Feshbach and exciton model calculations using EMPIRE, which satisfactorily reproduces the neutron channels, compared to the Weisskopf-Ewing model and Hybrid Monte Carlo calculations. The increment of the incomplete fusion fraction was observed with rising projectile energy. Conclusion: Contrary to the Alice14, experimental results are well reproduced by the EM-PIRE throughout the measured energy range. The signature of ICF over CF indicates that the breakup/transfer processes are involved in the weakly bound 7 Li-induced reaction on 93 Nb slightly above the Coulomb barrier.