The symmetry energy and the isoscaling properties of the fragments produced in
multifragmentation of 40Ar, 40Ca + 58Fe, 58Ni reactions at 25, 33, 45 and 53
MeV/nucleon were investigated within the framework of a statistical multifragmentation
model. The isoscaling parameter, ñ from the hot primary and cold secondary fragment
yield distributions, was studied as a function of the excitation energy, isospin (neutronto-
proton asymmetry), and fragment symmetry energy.
Through changing the symmetry energy in the statistical multifragmentation
model to describe the experimental data, it is observed that the isoscaling parameter ñ
decreases with increasing excitation energy and decreases with decreasing symmetry
energy. The parameter ñ 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 show very little influence on the isoscaling parameter when studied
as a function of excitation energy. However, the symmetry energy has a strong
influence on the isospin properties of the hot fragments. The results indicate that the
isospin properties of the fragments produced at high excitation energy and reduced
density in multifragmentation reactions are sensitive to the symmetry energy, indicating that the properties of hot nuclei at excitation energies, densities, and isospin away from
normal ground state nuclei are significantly different than those of normal (cold) nuclei
at saturation density.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/5745 |
| Date | 17 September 2007 |
| Creators | Iglio, Jennifer Ann |
| Contributors | Yennello, Sherry |
| Publisher | Texas A&M University |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | 1946950 bytes, electronic, application/pdf, born digital |
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