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Phys. Rev. C 64, 054615 (2001) [8 pages]

Isoscaling in statistical models

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M. B. Tsang, C. K. Gelbke, X. D. Liu, W. G. Lynch, W. P. Tan, G. Verde, and H. S. Xu *
National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824

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

R. Donangelo and S. R. Souza
Instituto de Fisica, Universidade Federal do Rio de Janeiro, Cidade Universitaria, Caixa Postale 68528, 21945-970 Rio de Janeiro, Brazil

C. B. Das, S. Das Gupta, and D. Zhabinsky
Physics Department, McGill University, 3600 University Street, Montreal, Canada H3A 2T8

Received 8 May 2001; published 23 October 2001

Different statistical multifragmentation models have been used to study isoscaling, i.e., the factorization of the isotope ratios from two reactions, into fugacity terms of proton and neutron number, R21(N,Z)=Y2(N,Z)/Y1(N,Z)=C exp(αN+βZ). Even though the primary isotope distributions are quite different from the final distributions due to evaporation from the excited fragments, the values of α and β are not much affected by sequential decays. α is shown to be mainly sensitive to the proton-to-neutron composition of the emitting source and may be used to study isospin-dependent properties in nuclear collisions, such as, the symmetry energy in the equation of state of asymmetric nuclear matter.


©2001 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.64.054615
DOI: 10.1103/PhysRevC.64.054615
PACS: 25.70.Pq, 25.70.Gh, 25.70.Mn, 24.60.-k

* On leave from the Institute of Modern Physics, Lanzhou, China.

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