Transverse emission of isospin ratios as a probe of high-density symmetry energy in isotopic nuclear reactions

被引：50

作者：

Feng, Zhao-Qing ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China

来源：

PHYSICS LETTERS B | 2012年 / 707卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Transverse emission; Isotopic systems; Isospin and momentum-dependent transport model; High-density symmetry energy; HEAVY-ION REACTIONS; COLLISIONS; MATTER;

D O I：

10.1016/j.physletb.2011.12.001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Transverse emission of preequilibrium nucleons, light clusters (complex particles) and charged pions from the isotopic Sn-112,Sn-124 + Sn-112,Sn-124 reactions at a beam energy of 400 A MeV, to extract the high-density behavior of nuclear symmetry energy, are investigated within an isospin and momentum-dependent transport model. Specifically, the double ratios of neutron/proton, triton/helium-3 and pi(-)/pi(+) in the squeeze-out domain are analyzed systematically, which are favorable in reducing the influence of the Coulomb force and less systematic errors. It is found that the transverse momentum distribution of isospin ratios strongly depend on the stiffness of nuclear symmetry energy, which would be a nice observable to extract the high-density symmetry energy. The collision centrality and the mass splitting of neutron and proton in nuclear medium play a significant role on the distribution structure of the ratios, but do not change the influence of symmetry energy on the spectrum. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：83 / 87

页数：5

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