Chemical instability and mechanical instability in asymmetric nuclear matter

Authors
Citation
Wf. Li et Fs. Zhang, Chemical instability and mechanical instability in asymmetric nuclear matter, ACT PHY C E, 50(10), 2001, pp. 1888-1895
Citations number
24
Language
CHINESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
ACTA PHYSICA SINICA
ISSN journal
1000-3290 → ACNP
Volume
50
Issue
10
Year of publication
2001
Pages
1888 - 1895
Database
ISI
SICI code
1000-3290(200110)50:10<1888:CIAMII>2.0.ZU;2-4
Abstract
Using a temperature, density, isospin and momentum dependent equation of st ate of nuclear matter obtained within the framework of Extended Skryme Hart ree-Fock theory, we study the chemical and mechanical instabilities of nucl ear matter at different temperatures, density and relative neutron excess, and compare them with the results of the simplified three-parameter potenti als, namely soft and hard potentials in which the symmetry energy part is a dded by hand. It is found that the asymmetric nuclear matter has remarkable chemical instability in the mechanically stable region. The relationship b etween the mechanical and chemical instabilities is different from the resu lt of soft and hard potentials, which is shown to result from the differenc e of the density dependence form of single particle potentials. We also pro vide the chemical and mechanical spinodal regions in pressure-density plane , and their isospin dependence is discussed. In particular, the behaviours of chemical instability around the critical temperature and the possible co nsequences in heavy-ion collisions at intermediate energy are investigated.