Isospin transport in 84Kr + 112,124Sn collisions at Fermi energies

TL;DR

This study investigates isospin transport phenomena in heavy-ion collisions at Fermi energies, revealing isospin diffusion and drift effects through isotopic analysis of fragments produced in 84Kr + Sn collisions.

Contribution

It provides experimental evidence of isospin diffusion and drift in heavy-ion collisions at Fermi energies, using high-resolution isotopic measurements.

Findings

Isotopic content depends on target n-richness, indicating isospin diffusion.

Enhanced neutron richness observed in fragments near the system's center of mass.

Evidence of isospin drift in the neck region of the collision.

Abstract

Isotopically resolved fragments with Z<=20 have been studied with high resolution telescopes in a test run for the FAZIA collaboration. The fragments were produced by the collision of a 84Kr beam at 35 MeV/nucleon with a n-rich (124Sn) and a n-poor (112Sn) target. The fragments, detected close to the grazing angle, are mainly emitted from the phase-space region of the projectile. The fragment isotopic content clearly depends on the n-richness of the target and it is a direct evidence of isospin diffusion between projectile and target. The observed enhanced neutron richness of light fragments emitted from the phase-space region close to the center of mass of the system can be interpreted as an effect of isospin drift in the diluted neck region.