Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-11-03
Phys.Rev.C57:1839-1845,1998
Physics
Nuclear Physics
Nuclear Theory
Scientific paper
10.1103/PhysRevC.57.1839
In this paper we continue the investigation of the lattice gas model. The main improvement is that we use two strengths for bonds: one between like particles and another between unlike particle to implement the isospin-dependence of nuclear force. The main effect is the elimination of unphysical clusters, like the dineutron or diproton. It is therefore a better description of nuclear system. Equation of state in mean field theory is obtained for nuclear matter as well as for $N\ne Z$ systems. Through numerical and analytical calculation we show that the new model maintains all the important features of the older model. We study the effect of the Coulomb interaction on multifragmentation of a compound system of A=86, Z=40 and also for A=197, Z=79. For the first case the Coulomb interaction has small effect. For the latter case the effect is much more pronounced but typical signatures of the lattice gas model such as a minimum (maximum) in the value of $\tau$ ($S_2$) are still obtained but at a much lower temperature.
Gupta Subal Das
Pan Jicai
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