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Symmetry energy and the isospin dependent equation of state

D. V. Shetty·S. J. Yennello·A. Botvina·G. A. Souliotis·M. Jandel·E. Bell·A. Keksis·S. Soisson·B. Stein·J. Iglio
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Abstract

The isoscaling parameter $α$, from the fragments produced in the multifragmentation of $^{58}$Ni + $^{58}$Ni, $^{58}$Fe + $^{58}$Ni and $^{58}$Fe + $^{58}$Fe reactions at 30, 40 and 47 MeV/nucleon, was compared with that predicted by the antisymmetrized molecular dynamic (AMD) calculation based on two different nucleon-nucleon effective forces, namely the Gogny and Gogny-AS interaction. The results show that the data agrees better with the choice of Gogny-AS effective interaction, resulting in a symmetry energy of $\sim$ 18-20 MeV. The observed value indicate that the fragments are formed at a reduced density of $\sim$ 0.08 fm$^{-3}$.

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D. V. Shetty, S. J. Yennello, A. Botvina, G. A. Souliotis, M. Jandel, E. Bell, A. Keksis, S. Soisson, B. Stein, J. Iglio. 2004-06-14. Symmetry energy and the isospin dependent equation of state. https://doi.org/10.1103/physrevc.70.011601

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