Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2006-03-03
Phys.Rev.C75:011601,2007
Physics
Nuclear Physics
Nuclear Experiment
5 pages, 4 figures, submitted to Phys. Rev. C
Scientific paper
10.1103/PhysRevC.75.011601
The evolution of the symmetry energy coefficient of the binding energy of hot fragments with increasing excitation is explored in multifragmentation processes following heavy-ion collisions below the Fermi energy. In this work, high-resolution mass spectrometric data on isotopic distributions of projectile-like fragments from collisions of 25 MeV/nucleon 86Kr and 64Ni beams on heavy neutron-rich targets are systematically compared to calculations involving the Statistical Multifragmentation Model. The study reveals a gradual decrease of the symmetry energy coefficient from 25 MeV at the compound nucleus regime (E*/A < 2 MeV) towards 15 MeV in the bulk multifragmentation regime (E*/A > 4 MeV). The ensuing isotopic distributions of the hot fragments are found to be very wide and extend towards the neutron drip-line. These findings may have important implications to the composition and evolution of hot astrophysical environments, such as core-collapse supernova.
Botvina A. S.
Jandel Magnus
Keksis A. L.
Shetty D. V.
Souliotis G. A.
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