Study of the reaction 70Zn (15 MeV/nucleon) + 64Ni with the MAGNEX spectrometer for the production of neutron-rich isotopes

S Koulouris,V Soukeras,A Spatafora,D Torresi,O Sgouros,J Klimo,C Agodi,I Ciraldo,A Pakou,G A Souliotis,K Palli,M Cavallaro,D Carbone,F Cappuzzello,Salvatore Calabrese ,O Fasoula ,G A Brischetto ,M Veselský

doi:10.1051/epjconf/202125207005

Abstract

We describe our efforts to study the production of neutron-rich isotopes from peripheral reactions of medium-mass heavy ions with the MAGNEX spectrometer at the INFN-LNS in Catania, Italy. Experimental data were obtained for the 70Zn+64Ni reaction at 15 MeV/nucleon. For the analysis of the data, we developed a new procedure for the reconstruction of both the atomic number Z and the ionic charge q of the ions, which is then followed by the identiﬁcation of the mass. Preliminary results and the analysis plan will be discussed.

Highlights

To date, approximately one half of the theoretically estimated 7000 bound nuclei have been produced and investigated
According to [12], the atomic number of the ejectiles is determined by the ∆Ecor–Eresid correlation involving the residual energy measured by the silicon detectors (Eresid) and the total energy loss (∆Ecor) in the gas section of Focal Plane Detector (FPD) corrected for path length differences depending on the angle of incidence
Using the√se calibrated quantities, and guided by the relation Z ∝ υ ∆E from Bethe-Bloch equation, we developed an approach for the Z reconstruction, following [16], that is based on the velocity, ∆Ecor and Etot, where Etot is the total kinetic energy of the ions reaching FPD and determined from the expression: Etot = ∆Ew + ∆Etot + Eresid where ∆Etot is the sum of the measured energy loss in the gas section of the FPD, Eresid the residual energy, as already mentioned, and ∆Ew a calculated correction for the energy loss in the entrance window of FPD

Summary

Introduction

Approximately one half of the theoretically estimated 7000 bound nuclei have been produced and investigated. To have access to nuclides with high neutron-excess, besides the traditional routes of spallation, fission and projectile fragmentation, it is necessary to pick up neutrons from the target Such nucleon transfer mechanisms mainly take place in peripheral nucleon-exchange reactions at beam energies from the Coulomb barrier [3] to the Fermi energy (20–40 MeV/nucleon) [4, 5]. Our interest was initially focused on the study of heavy-ion reactions at 25 MeV/nucleon, which led to a substantial production of neutron-rich nuclides [4] Encouraged by these results, we moved on to studies at 15 MeV/nucleon [6, 7] that were mainly based on the use of the medium-acceptance MARS spectrometer [8].

Calculations

Experimental Setup and Measurements

Particle Identification Procedure and Data Analysis

Discussion and Conclusions