Measurement of fusion excitation function for⁷Li+⁶⁴Ni near the barrier

Abstract

Total fusion (TF) excitation function has been measured for the system 7 Li + 64 Ni at the energies near the Coulomb barrier of the system. The evaporation residue (ER) cross sections have been estimated through the online detection of characteristic γ-rays of the ERs. The summed ER cross sections yielding the experimental TF cross section have been compared with the theoretical one dimensional barrier penetration model (1DBPM) prediction. The measured and the model cross sections are very close to each other at above barrier energies. However, an enhancement of the experimental TF cross section with respect to the 1DBPM prediction is observed at below barrier energies. Coupled channels (CC) calculation with inelastic excitations alone could not explain the enhancement. The origin of the enhancement is identified as due to the enhanced population of the αxn channels.A complete understanding of the effect of direct reaction channels like, breakup or transfer followed by breakup on fusion of weakly bound systems at near barrier energies is of primary importance [1,2]. In case of fusion of weakly bound stable projectiles like, 6 Li (S α = 1.47 MeV), 7 Li (S α = 201 , 0 0 EPJ Web of Conferences

Threshold anomalies in low-energy reactions with loosely-bound projectiles

“…The data are from Refs. [23][24][25][26], respectively, and the red diamonds represent the predictions of the EOM. Fig.…”