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Phys. Rev. Lett. 82, 1399 - 1401 (1999)

Disappearance of the Isospin Dependence of Multifragment Production

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M. L. Miller, O. Bjarki, D. J. Magestro, R. Pak *, N. T. B. Stone †, M. B. Tonjes, A. M. Vander Molen, and G. D. Westfall
National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1321

W. A. Friedman
Department of Physics, University of Wisconsin, Madison, Wisconsin 53706

Received 3 November 1998

We present measurements of the multiplicity of charged particles ( Nc) and intermediate mass fragments (IMFs) for 58Fe+58Fe and 58Ni+58Ni at incident energies of 45 to 105 MeV/nucleon. We find that the neutron-rich system emits more IMFs as a function of Nc at low incident energies while at the highest energy we observe a much smaller difference between the two systems. Expanding emitting source and statistical multifragmentation simulations reproduce the difference between the two systems at low energies while a charge percolation simulation describes the results at the highest energy.


©1999 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.82.1399
DOI: 10.1103/PhysRevLett.82.1399
PACS: 25.70.Pq, 24.10.Pa

* Permanent address: Department of Physics and Astronomy and Nuclear Science Research Laboratory, Rochester, NY 14627-1211.
† Permanent address: Advanced Systems Group, Pittsburgh Supercomputing Center, Pittsburgh, PA 15213.

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