EXTRACTING SYMMETRY ENERGY FROM PROJECTILE SPECTATOR FRAGMENTATION

摘要

In order to extract the symmetry energy,the Zbound (the sum of charge numberfor fragments having Z≥2) dependence of multiplicity of neutrons (Mn) fromthe projectile spectator fragmentation of 124Sn and 124La at 600 MeVucleonwithin isospin quantum molecular dynamics (IQMD) model is compared withthe experimental findings of ALADIN2000 collaboration.12 The findings favorthe soft symmetry energy with soft equation of state.For all the projectiles(124Sn,124 La,107 Sn),the peak Mn obey the universal behavior aroundZbound/ZProjectile≈ 0.7 with different value of Mn≈12,9,7,respectively.