Experimental study of the Ca40,48+Ca40,48 reactions at 35 MeV/nucleon

Q. Fable et al. (INDRA Collaboration)
Phys. Rev. C 106, 024605 – Published 10 August 2022

Abstract

In this article we investigate Ca40,48+Ca40,48 peripheral and semiperipheral reactions at 35 MeV/nucleon. Data were obtained using the unique coupling of the VAMOS high acceptance spectrometer and the INDRA charged particle multidetector. The spectrometer allowed high-resolution measurement of charge, mass, and velocity of the cold projectile-like fragment (PLF), while the INDRA detector recorded coincident charged particles with nearly 4π acceptance. The measured isotopic composition of the PLF identified in VAMOS and the average light charged particle (LCP) multiplicities are promising observables to study the isospin diffusion. The detection of the PLF in coincidence with LCP allows the reconstruction of the mass, charge, and excitation energy of the associated initial quasiprojectile nuclei (QP), as well as the extraction of apparent temperatures. We investigate the suitability of the isoscaling method with the PLF and the experimental reconstructed QP. The extracted α and Δ isoscaling parameters present a dependence on the considered system combination that could justify their use as a surrogate for isospin asymmetry in isospin transport studies. The reconstruction of the QP allows us to observe an evolution of the α/Δ with the size of the QP, the latter being consistent with a strong surface contribution to the symmetry energy term in finite nuclei. This leads to the conclusion that the reconstruction of the primary source is mandatory for the study of the symmetry energy term based on the isoscaling method for such reactions.

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  • Received 28 February 2022
  • Revised 30 June 2022
  • Accepted 27 July 2022

DOI:https://doi.org/10.1103/PhysRevC.106.024605

©2022 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 106, Iss. 2 — August 2022

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