EXTRACTING SYMMETRY ENERGY FROM PROJECTILE SPECTATOR FRAGMENTATION

In order to extract the symmetry energy, the Z_bound (the sum of charge number for fragments having Z ≥ 2) dependence of multiplicity of neutrons (M_n) from the projectile spectator fragmentation of ¹²⁴Sn and ¹²⁴La at 600 MeV/nucleon within isospin quantum molecular dynamics (IQMD) model is compared with the experimental findings of ALADIN2000 collaboration.¹² The findings favor the soft symmetry energy with soft equation of state. For all the projectiles (¹²⁴Sn, ¹²⁴ La, ¹⁰⁷ Sn), the peak M_n obey the universal behavior around Z_bound/Z_Projectile ≈ 0.7 with different value of M_n ≈ 12, 9, 7, respectively.