Experiment E789
Density dependence of the symmetry energy
A first INDRA-FAZIA experiment was performed in April-May 2019 at GANIL, it is the E789 experiment. It was successful and allowed to collect high quality data with a large statistic (more than 60 million events). The objective here is to characterize the density dependence of the symmetry energy of the equation of state (in particular the Lsym term) by studying the semi-peripheral collisions of the 58.64Ni+58.64Ni systems at 32 and 52 MeV per nucleon. Indeed, in this type of collision, the two nuclei exchange nucleons (protons and neutrons) during the overlapping phase. This exchange is governed in particular by the value of Lsym as well as the difference in density between the overlap zone and the projectile and target nuclei. The use of different combinations of 58Ni and 64Ni nuclei as projectile and target then allow to constrain more precisely the density dependence of the symmetry energy through the measurement of double isotopic ratio. Data calibrations are in progress and should lead to several publications in late 2020 – early 2021.
