Isospin Dependence Of The Nuclear Equation Of State

本研究将从多个角度提取核物质状态方程的同位旋依赖性。 利用经典分子动力学（CMD），我们将研究核结合能对同位旋的依赖性在核的基态，在无限核物质的密度，温度和同位旋条件的范围内，在不同的密度，温度和同位旋的激发核，并在不同的同位旋组成的核之间的反应。 所使用的经典分子动力学模型是以Urbana/尚潘小组获得的质子-质子、中子-中子和质子-中子势为基础的，它没有任何可调整的参数，也不需要增加产生碎片的代码或与反应无关的波动。 该项目将研究同尺度依赖性基态原子核结合能（与不同中子质子比的原子核有关）（为了得到Weissacker质量公式的同位旋扩展，并具有对同位旋的显式函数依赖性），研究无限核物质的EoS的等标度依赖性（提供每个粒子的能量的解析表达式，并明确地依赖于密度、温度和同位旋），激发核EoS的同标度依赖性研究（以获得有效的核预警系统，用于从反应中提取实验信息），它将研究核反应，以了解如何通过研究中子和质子来提取有关EoS及其Isospin依赖性的信息反应过程中的流动，同位旋输运比，分馏，双谱比和等标度，以评估作为探针的EoS的对称性能量项的等标度参数的价值。 所有的计算都将与密歇根州立大学、得克萨斯农工大学和其他加速器的实验数据相关联。拟议活动的智力价值将是了解同位旋在核力中未被探索的作用，完善计算模型--该模型可用于测试其他代码，并指导实验人员在密歇根州正在建设的新设施中设计实验。&该项目将在埃尔帕索的得克萨斯大学进行，本科生将参加，并与布宜诺斯艾利斯大学的Claudio Dorso教授合作。将努力将西班牙裔学生（男女）纳入该项目。 该项目的更广泛的影响是有利于核物理学，学生招聘到稀有同位素的不断增长的物理学领域，核物理学作为UTEP和埃尔帕索的研究选择的支持，本科生的研究方法的培训，以及西班牙裔学生进入物理学研究的介绍。

This study will extract the isospin dependence of the Equation of State (EoS) of nuclear matter from several angles. Using classical molecular dynamics (CMD) we will study the dependence of nuclear binding energy on isospin in nuclei on their ground state, in infinite nuclear matter at a range of density, temperature and isospin conditions, in excited nuclei at varying densities,temperatures and isospin, and in reactions between nuclei with different isospin compositions. The classical molecular dynamics model to be used is based on proton-proton, neutron-neutron and proton-neutron potentials obtained by the Urbana/Champaign group, and it does not have any adjustable parameters and does not need the addition of fragment-producing codes or fluctuations extraneous to the reaction. The project will study the isoscaling dependence (relating nuclei with different neutron-proton ratios) of binding energies of ground-state nuclei (to obtain isospin extensions of the Weissacker mass formula with explicit functional dependence on isospin), the study of the isoscaling dependence of the EoS of infinite nuclear matter (to provide analytical expressions for the energy per particle with explicit dependences on density, temperature and isospin), the study of the isoscaling dependence of the EoS of excited nuclei (to obtain an effective nuclear EoS that could be used to extract experimental information from reactions), and it will investigate nuclear reactions to understand how to extract information about the EoS and its isospin dependence through studies of the neutron and proton flow during the reaction, isospin transport ratio, fractionation, double spectral ratios and isoscaling to assess the value of the isoscaling parameters as probes of the symmetry energy term of the EoS. All computations will be linked to experimental data from Michigan State University, Texas A&M University, and other accelerators.The intellectual merit of the proposed activity will be to learn about the unexplored role of isospin in nuclear forces, to refine a computational model - which can be used to test other codes, and to guide experimentalists in designing their experiments in the new facilty under construction in Michigan. The project will be carried out at the University of Texas at El Paso with the participation of undergraduate students and in collaboration with Prof. Claudio Dorso of the University of Buenos Aires. An effort will be made to incorporate Hispanic students (both male and female) into this project. The broader impact of the project is a benefit to nuclear physics, the recruitment of students to the growing physics area of rare isotopes, the support of nuclear physics as a research option at UTEP and in El Paso, the training of undergraduate students in research methodology, and the introduction of Hispanic students into physics research.