Fragment yield distribution and the influence of neutron composition and excitation energy in multifragmentation reactions
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The isotopic properties of the primary and secondary fragment yield distribution in the multifragmentation of 58Fe + 58Ni and 58Fe + 58Fe reactions are studied with respect to the 58Ni + 58Ni reaction at 30, 40, and 47 MeV/nucleon. The reduced neutron and proton densities from the observed fragment yield distribution show primary fragment yield distribution to undergo strongly secondary deexcitations. The effect is small at the lowest excitation energy and smallest neutron-to-proton ratio and becomes large at higher excitation energies and higher neutron-to-proton ratio. The symmetry energy of the primary fragments deduced from the reduced neutron density is significantly lower than that for the normal nuclei at saturation density, indicating that the fragments are highly excited and formed at a reduced density. Furthermore, the symmetry energy is also observed to decrease slowly with increasing excitation energy. The observed effect is explained using the statistical multifragmentation model. 2005 The American Physical Society.
author list (cited authors)
Shetty, D. V., Botvina, A. S., Yennello, S. J., Souliotis, G. A., Bell, E., & Keksis, A.
complete list of authors
Shetty, DV||Botvina, AS||Yennello, SJ||Souliotis, GA||Bell, E||Keksis, A