U.S.-Romania Physics Research on Weak Interaction Processes in Nuclei

INT 0070789Varie这项由爱荷华州立大学的James Varie和罗马尼亚国家物理和核工程研究所的Sabin Stoica共同开展的美国-罗马尼亚研究项目将致力于通过将有效算符理论与先进的多体技术相结合，为原子核中的弱相互作用过程开发一个精确的理论框架。其目标是改进壳层模型(Sh.M)和准粒子随机位相近似(QRPA)计算，并将它们应用于研究原子核中发生的弱相互作用，包括双β衰变、常规β衰变和强子宇称破坏。为了做到这一点，美国-罗马尼亚团队将使用质子-中子qRPA和Sh.M方法以及现实的、微观的、有效的哈密顿量，然后分析产生的核矩阵元素(NME)。这一研究成果有望提高我们对原子核结构的理解，并有利于与天体物理和宇宙学相关的基础研究。这项理论物理研究通过使美国和中欧的专家能够在相互感兴趣和能力很强的领域结合互补的人才和共享研究资源，实现了促进科学知识的计划目标。

INT 0070789VaryThis U.S.-Romania research project between James Vary of Iowa State University and Sabin Stoica of the Romanian National Institute for Physics and Nuclear Engineering will work toward development of a precise theoretical framework for weak interaction processes in nuclei by combining the theory of effective operators with advanced many-body techniques. The goal is to improve shell-model (Sh.M) and quasiparticle random phase approximation (QRPA) calculations and apply them to studies of weak interactions occurring in the nuclei, including double-beta decay, conventional beta decay, and hadronic parity-violation. To do this the U.S.-Romanian team will employ both proton-neutron QRPA and Sh.M methods with realistic, microscopic, effective Hamiltonians and then analyze the resulting nuclear matrix elements (NME). Results are expected to improve our understanding of nuclear structure and benefit fundamental research related to astrophysics and cosmology.This research in theoretical physics fulfills the program objective of advancing scientific knowledge by enabling experts in the United States and Central Europe to combine complementary talents and share research resources in areas of strong mutual interest and competence.