7Be and 8B reaction dynamics at Coulomb barrier energies

E Strano,A Boiano,T Glodariu,C Boiano,L Stroe,D Pierroutsakou,T Sava,P Di Meo,A Guglielmetti,C Parascandolo,K Rusek,O Sgouros,N Imai,M La Commara,N Toniolo,D Kahl,L Yang,L Acosta,D Torresi,A Pakou,M Mazzocco,V Soukeras,N Keeley,C Manea,M Nicoletto,F Soramel,C Signorini,H Yamaguchi,S Kubono,C J Lin ,Yutaka Watanabe ,J A Lay ,H M Jia ,M Mukai,J P Fernández‐García ,Y Hirayama,Y Wakabayashi,Takashi Teranishi ,S C Jeong ,I Marte,C Stefanini,J Grębosz ,G Marquínez-Durán ,T Nakao,Yukihiro Sakaguchi ,H Ishiyama,S Kimura,A M Sanchez-Benitez ,N Iwasa,H Miyatake,E Stiliaris,Y.H Kim,Y Y Yang

doi:10.1051/epjconf/201818402015

Abstract

We investigated the reaction dynamics induced by the 7Be,8B+208Pb collisions at energies around the Coulomb barrier. Charged particles originated by both the col- lisions were detected by means of 6 ΔE-Eres telescopes of a newly developed detector array. Experimental data were analysed within the framework of the Optical Model and the total reaction cross-sections were compared together and with the 6,7Li+208Pb colli-sion data. According to the preliminary results, 7Be nucleus reactivity is rather similar to the 7Li one whereas the 8B+208Pb total reaction cross section appears to be much larger than those measured for reactions induced by the other weakly-bound projectiles on the same target.

Highlights

According to the preliminary results, 7Be nucleus reactivity is rather similar to the 7Li one whereas the 8B+208Pb total reaction cross section appears to be much larger than those measured for reactions induced by the other weakly-bound projectiles on the same target
EXOTIC is especially suitable for the production of RIBs by means of (p,n) reactions, since the larger projectile-to-target ratio ensures an additional forward focusing of the reaction products
The exclusive breakup counts are important because this process can be exploited for the extraction of the astrophysical reaction rate from the Coulomb dissociation of the projectile [7]

Summary

Introduction

The study of 7Be and 8B dynamical behavior is relevant for the understanding of several processes in the universe [1]: 7Be is at the top side of the reaction network which describes the primordial nucleosynthesis in the framework of the standard Big Bang, being involved in the production of the primordial lithium; jointly with 8B, is a main actor in the proton-proton chains of hydrogen burning in the main-sequence stars like our sun; in particular, 7Be is at the vertex of two reaction chains, being the product of the 3He+4He fusion; beta decays of 7Be and 8B are responsible of the neutrino flux from the Sun, studied for the understanding of neutrino oscillations; 7Be is involved in additional reaction networks which describe the nucleosynthesis model of the inomogeneus big bang and some supernovae.For the production of dripline nuclei via (p,n), (3He,n), (d,n) and (d,3He) two-body reactions, the facility EXOTIC [3] was laid out in Laboratori Nazionali di Legnaro (LNL), Italy. According to the preliminary results, 7Be nucleus reactivity is rather similar to the 7Li one whereas the 8B+208Pb total reaction cross section appears to be much larger than those measured for reactions induced by the other weakly-bound projectiles on the same target. The secondary RIB under production is separated from the scattered beam and other possible contaminant beams by means of a combination of 8 ion-optical devices and a series of slit-sets and collimators placed at suitable positions along the facility.

Results

Conclusion