U.S.-Brazil Cooperative Research: Tests of Fundamental Symmetries in the Compound Nucleus: A Study of Chaos in Quantum Systems

9722105米切尔美国-巴西奖将支持北卡罗来纳州立大学的加里·E·米切尔博士与巴西圣保罗大学的马希尔·侯赛因博士合作，测试化合物核的基本对称性。PI感兴趣的是核中对称性的表现以及它是如何受到多体系统的影响的。重点将放在原子核中一个近似对称性(同位旋)和一个基本对称性(宇称)的破缺上。表征复杂核系统涨落特性的统计分布反映了基本的对称性。然后，人们可以研究本征值和跃迁强度的统计分布，以寻找对称性的影响，甚至探测隐藏的对称性。米切尔一直是宇称破坏测量的积极参与者，也是同位旋混合测量的领导者。侯赛因是将随机矩阵理论应用于核物理和原子核对称性破缺方面的领先者。***

9722105 Mitchell This U.S.-Brazil Award will support Dr. Gary E. Mitchell of North Carolina State University to work with Dr. Mahir Hussein of the Universidade de Sao Paulo in Brazil, on tests of fundamental symmetries in the compound nucleus. The PIs are interested in the manifestation of symmetry in the nucleus and how it is affected by a many body system. The focus will be on the breaking of one approximate symmetry (isospin) and one fundamental symmetry (parity) in the nucleus. The statistical distributions that characterize the fluctuation properties of the complex nuclear system reflect the underlying symmetries. One can then study the statistical distributions of eigenvalues and of transition strengths to search for the effects of symmetries, and even detect hidden symmetries. Mitchell has been an active participant in the measurements on parity violation and a leader in the measurements on isospin mixing. Hussein is a leader in the application of random matrix theory to nuclear physics and to symmetry breaking in the nucleus. ***