$^{ ext{7}}$Li-induced reaction on $^{ ext{nat}}$Mo: A study of complete versus incomplete fusion

摘要

Several investigations on the complete-incomplete fusion (CF-ICF) dynamics of$\alpha$-cluster well-bound nuclei has been contemplated above the Coulombbarrier ($\sim$ 4-7 MeV/nucleon) in recent years. It is therefore expected toobserve significant ICF over CF in the reactions induced by a weakly bound$\alpha$-cluster nucleus at slightly above the barrier. In order to investigateCF-ICF in the loosely bound system, $^{\text{7}}$Li beam was bombarded on the$^{\text{nat}}$Mo foils, separated by the aluminium (Al) catcher foilsalternatively, within $\sim$ 3-6.5 MeV/nucleon. Evaporation residues producedin each foil were identified by the $\gamma$-ray spectrometry. Measured crosssection data of the residues were compared with the theoretical modelcalculations based on the equilibrium (EQ) and preequilibrium (PEQ) reactionmechanisms. The experimental cross section of $^{\text{101m,100,99m,97}}$Rh,$^{\text{97,95}}$Ru, $^{\text{99m,96,95,94,93m+g}}$Tc and $^{\text{93m}}$Moresidues measured at various projectile energies were satisfactorily reproducedby the simplified coupled channel approach in comparison to single barrierpenetration model calculation. Significant cross section enhancement in the$\alpha$-emitting channels was observed compared to EQ and PEQ modelcalculations throughout observed energy region. The ICF process over CF wasanalyzed by comparing with EMPIRE. The increment of the incomplete fusionfraction was observed with increasing projectile energies. Theoretical modelcalculations reveal that compound reaction mechanism is the major contributorto the production of residues. Theoretical evaluations substantiate thecontribution of ICF over the CF in $\alpha$-emitting channels.