Symmetry energy for fragmentation in dynamical nuclear collisions

Abstract

We extract values for the free symmetry energy as a function of the fragment size (the proton number Z) from antisymmetrized molecular dynamics (AMD) calculations of calcium collisions. Simple statistical physics describe well the distribution of hot nuclei at breakup, provided the surface symmetry term in the free energy is much smaller at high excitation than in ground state nuclei. This result may reflect the condition of low density and finite temperature when these systems disassemble.

arXiv comment11 pages, 4 figures

References in corpus (9)

• Nuclear Ground-State Masses and Deformations
• Neutron Star Structure and the Equation of State
• Isotopic Scaling in Nuclear Reactions
• Isospin Fractionation in Nuclear Multifragmentation
• Surface Symmetry Energy
• Isospin fractionation and isoscaling in dynamical nuclear collisions
• Antisymmetrized molecular dynamics with quantum branching processes for collisions of heavy nuclei
• Antisymmetrized molecular dynamics of wave packets with stochastic incorporation of Vlasov equation
• Isospin Effects in Nuclear Multifragmentation

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