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The present study deals with the extraction of the symmetry energy fromheavy-ion collisions at intermediate energies. Using the isospin quantummolecular dynamical (IQMD) model, the dependence of the sum of the chargenumber for fragments with $Z\ge2$ ($Z_\textrm{bound}$) on the multiplicity ofneutrons ($M_n$) from the projectile spectator fragmentation of $^{124}$Sn and$^{124}$La at 600 MeV/nucleon is compared with the experimental results of theALADIN-2000 Collaboration. The comparison suggest a soft symmetry energy. Inaddition, the sensitivities of the symmetry energy towards the$Z_\textrm{bound}$ dependence on proton multiplicity ($M_p$), neutron-to-protonsingle [$R(n/p)$] and double ratio [$R_D(n/p)$] are also examined. The$Z_\textrm{bound}$ dependence of $R(n/p)$ is found to be the most sensitiveobservable towards the symmetry energy. The ALADIN Collaboration should extendthe results for $R(n/p)$ in the near future.

Understanding the symmetry energy using data from the ALADIN-2000 Collaboration taken at the GSI Large Neutron Detector