Abstract
Quasielastic scattering cross sections for the reaction 7 Li+159 Tb have been measured at large backangles, at energies around the Coulomb barrier. The quasielastic barrier distribution has been extracted from the measured quasielastic scattering excitation function, including and excluding α particle contribution. The peak of the quasielastic barrier distribution including α particle contribution shows a shift towards higher energy compared to the peak of the distribution without α particles. The quasielastic barrier distribution when compared to the calculated fusion barrier distribution, appears to show reasonable agreement for the system.
Highlights
Near barrier heavy ion fusion is strongly influenced by the internal structure of the colliding nuclei and coupling to the direct nuclear processes, like inelastic excitation and direct nucleon transfer
The coupling between the relative motion and intrinsic degrees of freedom of the interacting nuclei leads to an enhancement of fusion cross sections at energies below the average fusion barrier, relative to the cross sections obtained from the one-dimensional (1D) barrier penetration model calculations
The extra α particle contribution arising from the double counting of the α-particles for the p-pickup channel may be neglected in comparison to the total α particle contribution for the reaction
Summary
Near barrier heavy ion fusion is strongly influenced by the internal structure of the colliding nuclei and coupling to the direct nuclear processes, like inelastic excitation and direct nucleon transfer. Studies have been carried out [10,11,12,13,14,15,16] to investigate the fusion barrier distributions derived from large backangle QEL scattering cross sections for systems involving weakly bound nuclei For such systems, the breakup channel is expected to play a significant role. Systems, QEL scattering, including no-capture breakup (NCBU) and incomplete fusion (ICF) along with elastic, inelastic and transfer processes, may be considered to be complementary to the complete fusion (CF) of the projectile with the target For such systems, a comparative investigation of barrier distributions extracted from fusion and back-angle QEL excitation functions appears to be very interesting. The x-axis of the twodimensional ∆E-Etot spectrum was energy calibrated using the elastic peaks of 7Li beam scattered from 159Tb target at different bombarding energies below the Coulomb barrier
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