In this contribution we investigate the nuclear dynamics and the nuclear equation of state (NEOS) by a detailed study of heavy-ion collisions at intermediate energies. Indeed, we explore the isospin transport phenomena occurring during the collision between the projectile and target having different isospin contents. In particular, two observables are investigated the isospin diffusion and isospin migration. The former is related to the nucleon exchange process between the projectile and target; the latest is related to the neutron migration towards the low density region in the neck formed at mid-rapidity. Both observables provide an important information on the density dependence of the symmetry energy term of the NEOS. We will report on the experiments 40,48Ca+40,48Ca at E/A=35 MeV performed at GANIL, where we coupled the VAMOS spectrometer with the 4π INDRA detector. The use of the high acceptance spectrometer is to measure the isotopic and velocity distributions of the projectile like fragment (PLF) with high resolution, and INDRA is used, to estimate the impact parameter and excitation energy by measuring all charged products emitted in coincidence with PLF. From these experiments we obtain a set of data that for the first time measure different isospin sensitive observables in the same reaction. In particular a direct detection of the PLF residue in coincidence with an extraction of information about the N/Z of mid-rapidity. The set of data is open to comparison to all transport models engaged to link data to the symmetry energy.

Isospin effects on the nuclear equation of state: Diffusion and migration

ACS Fall 2021

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