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

Abstract

The present study deals with the extraction of the symmetry energy from heavy-ion collisions at intermediate energies. Using the isospin quantum molecular dynamical (IQMD) model, the dependence of the sum of the charge number for fragments with $Z\ge 2$ ($Z_{\text{bound}}$) on the multiplicity of neutrons ($M_n$) from the projectile spectator fragmentation of ${}^{124}$Sn and ${}^{124}$La at 600 MeV/nucleon is compared with the experimental results of the ALADIN-2000 Collaboration. The comparison suggest a soft symmetry energy. In addition, the sensitivities of the symmetry energy towards the $Z_{\text{bound}}$ dependence on proton multiplicity ($M_p$), neutron-to-proton single [$R(n/p)$] and double ratio [$R_D(n/p)$] are also examined. The $Z_{\text{bound}}$ dependence of $R(n/p)$ is found to be the most sensitive observable towards the symmetry energy. The ALADIN Collaboration should extend the results for $R(n/p)$ in the near future.

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Cited by in corpus (10)

• Shannon Information Entropy in Heavy-ion Collisions
• Thermodynamic properties and shear viscosity over entropy density ratio of nuclear fireball in a quantum-molecular dynamics model
• ${}^3$H/${}^3$He ratio as a probe of the nuclear symmetry energy at sub-saturation densities
• Isospin-asymmetric nuclear matter
• Model dependence of isospin sensitive observables at high densities
• Chemical Property of Colliding Sources in 124,136Xe and 112,124Sn Induced Collisions in Isobaric Ratio Difference and Isoscaling Methods
• Energy-Dependence of Nucleus-Nucleus Potential and Friction Parameter in Fusion Reactions
• Exploiting neutron-rich radioactive ion beams to constrain the symmetry energy
• Symmetry-energy dependence of the dynamical dipole mode in the Boltzmann-Uehling-Uhlenbeck model
• Nuclear medium effect on nuclear modification factor of protons and pions in intermediate-energy heavy ion collisions