Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2004-06-04
Phys.Rev. C70 (2004) 011601
Physics
Nuclear Physics
Nuclear Experiment
5 pages, 5 figures, Accepted for publication in Phys. Rev. C (Rapid Communication)
Scientific paper
10.1103/PhysRevC.70.011601
The isoscaling parameter $\alpha$, 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$^{-3}$.
Bell Eric
Botvina Alexander
Iglio J.
Jandel Magnus
Keksis August
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