Symmetry energy and the isoscaling properties of the fragments produced inAr40,Ca40+Fe58,Ni58reactions at 25, 33, 45, and 53 MeV/nucleon
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Abstract
The symmetry energy and the isoscaling properties of the fragments produced in the multifragmentation of $^{40}\mathrm{Ar}$, $^{40}\mathrm{Ca}+^{58}\mathrm{Fe}$, $^{58}\mathrm{Ni}$ reactions at 25, 33, 45, and 53 MeV/nucleon were investigated within the framework of statistical multifragmentation model. The isoscaling parameters \ensuremath{\alpha}, from the primary (hot) and secondary (cold) fragment yield distributions, were studied as a function of excitation energy, isospin (neutron-to-proton asymmetry), and fragment symmetry energy. It is observed that the isoscaling parameter \ensuremath{\alpha} decreases with increasing excitation energy and decreasing symmetry energy. The parameter \ensuremath{\alpha} is also observed to increase with increasing difference in the isospin of the fragmenting system. The sequential decay of the primary fragments into secondary fragments, when studied as a function of excitation energy and isospin of the fragmenting system, show very little influence on the isoscaling parameter. The symmetry energy, however, has a strong influence on the isospin properties of the hot fragments. The experimentally observed scaling parameters can be explained by symmetry energy that is significantly lower than that for the ground-state nuclei near saturation density. The results indicate that the properties of hot nuclei at excitation energies, densities, and isospin away from the normal ground-state nuclei could be significantly different.
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