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

INT 0070789 VaryThis美国-罗马尼亚爱荷华州州立大学的詹姆斯·瓦里和罗马尼亚国家物理与核工程研究所的萨宾·斯托伊卡之间的研究项目将致力于通过将有效算子理论与先进的多体技术相结合，发展核中弱相互作用过程的精确理论框架。目标是改进壳模型（Sh. M）和准粒子无规相近似（QRPA）的计算，并将其应用于研究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。 为此，美国-罗马尼亚团队将采用质子-中子QRPA和Sh. M方法与现实的，微观的，有效的哈密顿量，然后分析得到的核矩阵元（NME）。 该项目的研究成果将有助于提高我们对原子核结构的认识，并对天体物理学和宇宙学的基础研究有所裨益。该项目的理论物理研究将使美国和中欧的专家们能够在相互感兴趣和有能力的领域联合收割机互补并共享研究资源，从而实现推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.