Eur. Phys. J. A (2005) 25: 57-64
https://doi.org/10.1140/epja/i2004-10281-7

Original Article

Isospin and symmetry energy effects on nuclear fragment production in liquid-gas-type phase transition region

¹ Department of Physics, University of Selçuk, 42075, Konya, Turkey
² Gesellschaft fur Schwerionenforschung, D-64291, Darmstadt, Germany
³ Institute for Nuclear Research, Russian Academy of Science, RU-117312, Moscow, Russia

^* e-mail: nihal@selcuk.edu.tr

Received: 18 October 2004
Accepted: 31 May 2005
Published online: 24 June 2005

Abstract

We have shown that the isospin of nuclei influences the fragment production during the nuclear liquid-gas phase transition. Calculations for Au¹⁹⁷, Sn¹²⁴, La¹²⁴ and Kr⁷⁸ at various excitation energies were carried out on the basis of the statistical multifragmentation model (SMM). We analyzed the behavior of the critical exponent τ with the excitation energy and its dependence on the critical temperature. Relative yields of fragments were classified with respect to the mass number of the fragments in the transition region. In this way, we have shown that nuclear multifragmentation exhibits a “bimodality” behavior. We have also shown that the symmetry energy has a small influence on fragment mass distribution; however, its effect is more pronounced in the isotope distributions of produced fragments.