Eur. Phys. J. A (2020) 56: 102
https://doi.org/10.1140/epja/s10050-020-00105-z

Review

Nuclear neck-density determination at Fermi energy with CHIMERA detector

¹ INFN-Sezione di Catania, Via S. Sofia, 64, Catania, Italy
² INFN-Laboratori Nazionali del Sud, Via S. Sofia, 62, Catania, Italy
³ Dipartimento di Fisica e Astronomia “Ettore Majorana”, Università di Catania, Via S. Sofia, 64, Catania, Italy
⁴ Faculty of Physics, University of Warsaw, Warsaw, Poland
⁵ Heavy Ion Laboratory, University of Warsaw, Warsaw, Poland
⁶ National Center for Nuclear Research, Otwock-Świerk, Poland
⁷ Saha Institute of Nuclear Physics, Kolkata, India
⁸ Dipartimento di Scienze MIFT, Università di Messina, Messina, Italy
⁹ Facoltà di Ingegneria e Architettura, Università Kore, Enna, Italy
¹⁰ Instituto de Física, Universidad Nacional Autónoma de México, Mexico City, Mexico
¹¹ Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, Mexico

^* e-mail: angelo.pagano@ct.infn.it

Received: 11 June 2019
Accepted: 27 February 2020
Published online: 2 April 2020

Abstract

Binary collisions of either stable or radioactive heavy ions at Fermi energies allow to study the nuclear reaction mechanisms under dynamical conditions of non-equilibrium and the formation of transient pieces of nuclear matter of very short mean life times at sub-normal density. An important role in the evolutionary phase of the collision is played by the gradient of the nuclear density affecting the isospin asymmetry of the reaction products by typical transport phenomena such as the isospin diffusion and drift. Experimental determination of the value of the nuclear matter density in the early phase of the collision is a crucial step towards understanding the underlying mechanism responsible for the production of clusters. In this paper a method for evaluating the nuclear density in semi-peripheral collisions in the reaction at 35 MeV/nucleon as studied with the CHIMERA multi-particle detector is described.