Abstract
With the aim to investigate the in∞uence of the breakup channel on difierent reaction channels, the elastic scattering and fusion of 9 Be with the medium mass target 89 Y has been stud- ied at near barrier energies. Optical model analysis of the elastic data has been carried out and a dispersion relation applied to the real and imaginary potentials to investigate their energy depen- dence from which the presence of breakup threshold anomaly has been observed. Complete fusion (CF) cross sections, obtained for 9 Be+ 89 Y system, are found to be suppressed by (20 § 5)% as compared to the coupled-channels calculations without breakup coupling. This observation has been further conflrmed by comparing these cross sections with those for the 4 He+ 93 Nb and 12 C+ 89 Y systems, where fusion is induced by a tightly bound projectile and forms a nearby compound nu- cleus to that formed by 9 Be+ 89 Y. Results from the breakup coupling done in continuum discretized coupled-channels calculations show that the elastic cross sections thus obtained, which also flt the experimental elastic cross sections, are enhanced compared to the uncoupled calculations which im- plies a reduction in absorption/fusion cross sections. These enhanced cross sections suggest that the dynamic polarization potential produced due to breakup coupling is repulsive in nature. Thus the efiective (bare+polarization) potential around the barrier becomes less attractive leading to the absence of the normal threshold anomaly.
Highlights
Reactions induced by weakly bound projectiles have been rigorously studied over the last two decades
Statistical model calculations show this contribution to be negligible). These cross sections were further integrated to get the total inclusive breakup α cross sections plotted in Fig. 3 by unfilled diamonds, along with the reaction cross sections obtained from the optical model analysis of the elastic data and Complete fusion (CF) cross sections obtained from a separate measurement carried out by us
The dispersion relation is satisfied by the 9Be+89Y system
Summary
Reactions induced by weakly bound projectiles have been rigorously studied over the last two decades. In the case of fusion of the weakly bound stable nuclei, a suppression of the CF cross sections has been observed at above barrier energies as compared to the CC calculations without inclusion of breakup coupling. EPJ Web of Conferences ter breakup fuses with the target) could be measured for the 9Be+27Al [11] and 9Be+64Zn [12, 13] systems Comparison of these experimental fusion cross sections with CC calculations does not show any suppression [12]. With the aim to study the influence of breakup channel on the scattering and fusion of the weakly bound nucleus 9Be with a medium mass target at near barrier energies, we have carried out the elastic scattering and fusion measurements for the 9Be+89Y system
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