Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2003-09-22
Nucl.Phys. A735 (2004) 219-247
Physics
Nuclear Physics
Nuclear Experiment
35 pages, 19 figures, submitted to Nuclear Physics A
Scientific paper
10.1016/j.nuclphysa.2004.01.133
We study the anisotropy effects measured with INDRA at GSI in central collisions of Xe+Sn at 50 A.MeV and Au+Au at 60, 80, 100 A.MeV incident energy. The microcanonical multifragmentation model with non-spherical sources is used to simulate an incomplete shape relaxation of the multifragmenting system. This model is employed to interpret observed anisotropic distributions in the fragment size and mean kinetic energy. The data can be well reproduced if an expanding prolate source aligned along the beam direction is assumed. An either non-Hubblean or non-isotropic radial expansion is required to describe the fragment kinetic energies and their anisotropy. The qualitative similarity of the results for the studied reactions suggests that the concept of a longitudinally elongated freeze-out configuration is generally applicable for central collisions of heavy systems. The deformation decreases slightly with increasing beam energy.
Auger Gerard
Begemann-Blaich M. L.
Bellaize N.
Bittiger R.
Bocage F.
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