Investigation of the fusion process for B10+Au197 at near-barrier energies

M Aversa,A Arazi,M A G Alvarez,L C Chamon,V Scarduelli,G V Martí,V A B Zagatto,D Hojman,A J Pacheco,E De Barbará,J De Jesús,D Abriola,A Lépine-Szily,L R Gasques,J P Fernández-García,M A Cardona

doi:10.1103/physrevc.101.044601

Abstract

In a previous work, we presented data for the $^{10}\mathrm{B}+^{197}\mathrm{Au}$ system, corresponding to quasielastic and elastic scattering, $^{197}\mathrm{Au}$ inelastic excitation, and one neutron pickup transfer, measuring the angular distribution of scattered beam-like ejectiles at several energies around the Coulomb barrier. In this paper, we present data for the fusion process of the same system, at several energies around the Coulomb barrier, as well as new data for one neutron pickup and stripping transfer. In this case, we detected offline $\ensuremath{\gamma}$ rays stemming from the $\ensuremath{\beta}$-delayed decay chain of fusion-evaporation residues and heavy transfer products. As in our previous work, we analyzed this data set with coupled reaction channels calculations using the S\~ao Paulo potential. We show that the coupling to the one neutron transfer channel is quite important to describe the fusion data at the sub-barrier energy region. We also provide a comparison of the experimental fusion cross sections obtained for $^{10}\mathrm{B}+^{197}\mathrm{Au}$ with data for several other systems involving the same target nucleus.

Highlights

Several models for the real and imaginary parts of the nuclear interaction potential have been developed to describe a large number of heavy-ion elastic scattering data measured at energies below and above the Coulomb barrier [1–7]
We presented data for the 10B + 197Au system, corresponding to quasielastic and elastic scattering, 197Au inelastic excitation, and one neutron pickup transfer, measuring the angular distribution of scattered beam-like ejectiles at several energies around the Coulomb barrier
All the lighter systems present similar behavior, small enhancement at the sub-barrier region, with exception of the 10B + 197Au for which the enhancement is somewhat larger. We suggest that this behavior could be due to the effect of the coupling to the one neutron pickup transfer, which is very important for the appropriate description of the fusion process in the case of 10B

Summary

INTRODUCTION

Several models for the real and imaginary parts of the nuclear interaction potential have been developed to describe a large number of heavy-ion elastic scattering data measured at energies below and above the Coulomb barrier [1–7]. A suppression of the experimental CF cross sections at energies above the Coulomb barrier is observed in comparison with results obtained from single barrier penetration model calculations [16–19] This phenomenon is associated with the typically low breakup threshold of the weakly bound projectiles, which may break up into a number of different mass partitions before reaching the fusion barrier. Open Laboratory of Nuclear Physics (LAFN, acronym in Portuguese) in Brazil, and the TANDAR Laboratory in Argentina This complete data set was well described through theoretical coupled reaction channels (CRC) calculations which showed the importance of these couplings to describe experimental data. We present new experimental data for the total fusion (TF) cross sections for the 10B + 197Au system obtained at the TANDAR Laboratory from offline measurements of the characteristic γ -ray yields.

EXPERIMENTAL SETUP AND PROCEDURES

THEORETICAL CALCULATIONS

Findings

CONCLUSION