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Phys. Rev. Lett. 78, 1026 - 1029 (1997)

Isospin Dependence of the Balance Energy

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R. Pak1, Bao-An Li2, W. Benenson1, O. Bjarki1, J. A. Brown1, S. A. Hannuschke1, R. A. Lacey3, D. J. Magestro1, A. Nadasen4, E. Norbeck5, D. E. Russ6, M. Steiner1, N. T. B. Stone1, A. M. Vander Molen1, G. D. Westfall1, L. B. Yang5, and S. J. Yennello7
1National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1321
2Cyclotron Institute and Department of Physics, Texas A&M University, College Station, Texas 77843-3366
3Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400
4Department of Natural Sciences, University of Michigan, Dearborn, Michigan 48128-1491
5Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242-1479
6Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742-2021
7Cyclotron Institute and Department of Chemistry, Texas A&M University, College Station, Texas 77843-3366

Received 20 August 1996

The energy at which collective transverse flow in the reaction plane disappears, the balance energy Ebal, is found to depend on the isospin of the system using the reactions 58Fe+58Fe and 58Ni+58Ni. The more neutron-rich system exhibits higher balance energies for all measured impact parameters, in agreement with the predictions of a transport model which incorporates an isospin dependent mean field and isospin dependent in-medium nucleon-nucleon cross sections.


©1997 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.78.1026
DOI: 10.1103/PhysRevLett.78.1026
PACS: 25.70.Pq, 25.75.Ld

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