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The isoscaling parameter α, from the fragments produced in the multifragmentation of ⁵⁸Ni+⁵⁸Ni, ⁵⁸Fe+⁵⁸Ni and ⁵⁸Fe+⁵⁸Fe reactions at 30, 40 and 470.3em0exMeV∕nucleon, was compared with that predicted by the antisymmetrized molecular dynamic calculation based on two different nucleon-nucleon effective forces, namely the Gogny and Gogny-AS interaction. The results show that the data agree better with the choice of Gogny-AS effective interaction, resulting in a symmetry energy of ~18--200.3em0exMeV. The observed value indicates that the fragments are formed at a reduced density of ~0.080.3em0exfm^-3.
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Shetty et al. (2004) studied this question.
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