INDRA collaboration

Phys. Rev. C 94, 044611 – Published 18 October 2016

Background : We study heavy-ion reactions from barrier up to Fermi energy. The data were acquired with the INDRA detector at the GANIL (Caen, France) facility.

Purpose : We aim to determine the reaction and fusion cross sections for the reactions induced by Xe129 projectiles on Snnat targets for incident energies ranging from 8A to 35A MeV. In particular, the evaluation of the fusion and incomplete fusion cross sections is the main purpose, altogether with the comparison with the systematics of Eudes et al. [Europhys. Lett. 104, 22001 (2013)].

Method : The reaction cross sections are evaluated at each beam energy with data acquired thanks to the INDRA 4π array. The events are sorted with the help of the observable Eiso,max. We focus therefore our study on a selected sample of events, in such a way that the fusion and incomplete fusion cross sections can be estimated.

Results : We present the excitation function of reaction and fusion cross sections for the heavy and nearly symmetric system 129Xe+natSn from 8A to 35A MeV. For the fusion excitation function the comparison with the systematics of Eudes et al. seems to be in a fair agreement starting from the beam energy 20A MeV. For the lower beam energies (8A and 12A MeV) discrepancies are observed.

Conclusions : The evaluated fusionlike cross sections show a good agrement with a recent systematics for beam energies greater than 20A MeV. For low beam energies the cross-sectional values are lower than the expected ones. A probable reason for these low values is in the fusion hindrance at energies above or close to the barrier.