8B + 208Pb Elastic Scattering at Coulomb Barrier Energies

M La Commara,D Pierroutsakou,P Di Meo,L Yang,C Signorini,F Soramel,C Boiano,C Parascandolo,M Mazzocco,A Boiano,M Mukai,C Manea,H Yamaguchi,D Kahl,D Torresi,M Nicoletto,N Imai,S Kubono ,E Strano ,S Kimura ,T Nakao ,Takashi Teranishi ,Yutaka Watanabe ,Yukihiro Sakaguchi ,H Ishiyama ,Y Hirayama ,N Iwasa ,J Grębosz ,Y Wakabayashi ,H Miyatake ,Á M Sánchez-Benítez ,Sohee Jeong ,H M Jia ,C J Lin ,Y H Kim ,Y Yang

doi:10.1051/epjconf/201716300032

Abstract

The scattering process of weakly-bound nuclei at Coulomb barrier energies provides deep insights on the reaction dynamics induced by exotic nuclei. Within this framework, we measured for the first time the scattering process of the short-lived Radioactive Ion Beam (RIB) 8 B (S p = 0.1375 MeV) from a 208 Pb target at 50 MeV beam energy. The 8 B RIB was produced by means of the in-flight facility CRIB (RIKEN, Japan) with an average intensity on target of 10 kHz and a purity about 25%. Elastically scattering ions were detected in the angular range θ c.m . = 10°-160° by means of the detector array EXPADES. A preliminary optical model analysis indicates a total reaction cross section of about 1 b, a value, once reduced, 2-3 times larger than those obtained for the reactions induced by the stable weakly-bound projectiles 6,7 Li on a 208 Pb target in the energy range around the Coulomb barrier.

Highlights

Nuclei far from β−stability valley, as 6He, 11Be, 8B, are very interesting because of their peculiarities as far as their structure and their way to interact with other nuclei are concerned, during the last decades many theoretical and experimental efforts have been devoting to the investigation of halo nuclei in order to shed light on their unusual and intriguing features [1]
Despite great efforts in experiments and theories over the past decades, the precise description on the influence of breakup channel on fusions is still elusive, due to the limited knowledge on the breakup process, especially for the unstable reaction systems. More knowledge in this framework can be obtained starting from the investigation of simple processes, as elastic scattering
It is well accepted by the nuclear physicists community that the presence of a proton halo or skin may heavily influence the behavior e-mail: Marco.LaCommara@na.infn.it of an exotic nucleus in terms of nuclear reaction mechanism as well as can strongly influence its structure [1] [2]

Summary

Introduction

Nuclei far from β−stability valley, as 6He, 11Be, 8B, are very interesting because of their peculiarities as far as their structure and their way to interact with other nuclei are concerned, during the last decades many theoretical and experimental efforts have been devoting to the investigation of halo nuclei in order to shed light on their unusual and intriguing features [1]. More knowledge in this framework can be obtained starting from the investigation of simple processes, as elastic scattering.

Results

Conclusion