Isospin influences on particle emission and critical phenomena in nuclear dissociation
Isospin influences on particle emission and critical phenomena in nuclear dissociation
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DOI：
10.1103/physrevc.60.024607
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发表时间：
1999-07
影响因子：
3.1
通讯作者：
Y. Ma;Q. Su;W. Shen;D. D. Han-D.;J. Wang;X. Cai;D. Fang;H. Zhang
中科院分区：
文献类型：
--
作者：
Y. Ma;Q. Su;W. Shen;D. D. Han-D.;J. Wang;X. Cai;D. Fang;H. Zhang
在同位旋依赖性晶格气体模型的框架中，研究了在中等冻结密度远中等尺寸 Xe 同位素下，粒子发射和临界点行为的特征作为分解源的同位旋和温度的函数。发射的光粒子的多重性、同位素和光粒子的同位旋比显示出对解离源的同位旋的强烈依赖性，但轻同位素对的双倍比和由一些临界可观测量的极值确定的临界温度对系统的同位旋不敏感。团簇质量分布的幂律参数、中间质量碎片的平均重数 (IMF)、信息熵和 Campi 二阶矩的值也显示出在临界点对 Xe 同位素同位旋的较小依赖性。此外，还研究了中子（N-n）、质子（N-p）、带电粒子（N-CP）和IMF（N-IMF）的平均多重数的斜率、最大碎片质量数（A（max））的斜率以及拆解源的每个核子的激发能（E*/A）与温度的关系，以及N-n、N-p、N-CP、N-IMF、 A（最大值）和 E*/A。发现它们可以作为对临界现象的附加判断。 [S0556-2813(99)302108-1]。
Features of particle emission and critical point behavior are investigated as functions of the isospin of disassembling sources and temperature at a moderate freeze-out density far medium-size Xe isotopes in the framework of the isospin-dependent lattice gas model. Multiplicities of emitted light particles, isotopic, and isobaric ratios of light particles show the strong dependence on the isospin of the dissociation source, but double ratios of light isotope pairs and the critical temperature determined by the extreme values of some critical observables are insensitive to the isospin of the systems. Values of the power law parameter of cluster mass distribution, mean multiplicity of intermediate mass fragments (IMF), information entropy, and Campi's second moment also show a minor dependence on the isospin of Xe isotopes at the critical point. In addition, the slopes of the average multiplicities of the neutrons (N-n), protons (N-p), charged particles (N-CP), and IMFs (N-IMF), slopes of the largest fragment mass number (A(max)), and the excitation energy per nucleon of the disassembling source (E*/A) to temperature are investigated as well as variances of the distributions of N-n, N-p, N-CP, N-IMF, A(max), and E*/A. It is found that they can be taken as additional judgements to the critical phenomena. [S0556-2813(99)302108-1].