U.S.-Japan Cooperative Science: Mean-Field Approach to Collective Excitations in Unstable Medium-Mass and Heavy Nuclei

0124053 Nazarewicz该奖项支持田纳西大学的Witold Nazarewicz教授和日本京都大学的Kenichi Matsuyanagi教授之间为期三年的合作研究项目。 研究人员将对不稳定的中等质量和重核中的集体激发进行平均场方法的研究。 研究的重点是核结构物理学的那些方面，这些方面在社区中具有最高优先级：1）放射性核束物理学，将在质子和中子滴线周围的稳定极限处访问核，以及2）伽马射线光谱学，访问快速旋转核中的离散核状态直到裂变极限。 其目的是进一步发展的技术，可以处理的特殊性质的弱束缚核，费米能量接近零。 Hartree-Bogolyubov（HFB）计划，包括非结合态是必要的。 目前的程序，包括连续状态通常被限制为球形。 该提案将继续发展HFB计划，包括非球形形状以及连续状态。 这对于更真实地描述中子滴线周围的原子核是必要的。 一个有趣的可能性，不同形状的中子和质子，包括中子晕，然后可以调查。 该计划的发展将允许研究双β衰变，这不仅对核物理学，而且对粒子物理学和天体物理学具有根本意义。该项目汇集了两个具有互补专业知识和研究能力的实验室的努力。该研究解决了一些对日本和美国低能核结构社区非常重要的问题。 美国和日本的核结构理论家数量很少，而且群体是孤立的。 该项目将为两国共同努力提供一个很好的机会。 通过交流思想和技术，该项目将扩大我们的基础知识，促进国际理解与合作。 该项目通过博士后和一名研究生的参与促进国际人力资源。 研究人员计划在科学期刊上发表研究结果，并在科学会议上报告研究结果。

0124053NazarewiczThis award supports a three-year collaborative research project between Professor Witold Nazarewicz at the University of Tennessee and Professor Kenichi Matsuyanagi of Kyoto University in Japan. The researchers will undertake a study of the mean-field approach to collective excitations in unstable medium-mass and heavy nuclei. The focus of the research is in those aspects of nuclear structure physics which are of highest priority in the community: 1) radioactive nuclear beam physics which will access nuclei at the limits of stability around the proton and neutron drip lines, and 2) gamma ray spectroscopy which accesses discrete nuclear states in rapidly rotating nuclei up to the fission limit. The intent is the further development of techniques that can treat the special properties of weakly bound nuclei, where the Fermi energy is close to zero. Hartree-Bogolyubov (HFB) programs that include unbound states are needed. Current programs that include the continuum states are usually restricted to spherical shapes. The proposal will continue the development of HFB programs that include non-spherical shapes as well as the continuum states. This is necessary for a more realistic description of nuclei around the neutron drip line. An interesting possibility of different shapes for neutrons and protons, including neutron halos, can then be investigated. The development of the program will permit investigation of double beta decay, which has fundamental interest not only to nuclear physics, but also particle physics and astrophysics.The project brings together the efforts of two laboratories that have complementary expertise and research capabilities. The research addresses a number of questions that are of great importance for Japanese and U.S. low-energy nuclear structure communities. The number of nuclear structure theorists in the U.S. and Japan is small and the groups are isolated. The project will offer a good opportunity to join efforts between the two countries. Through the exchange of ideas and technology, this project will broaden our base of basic knowledge and promote international understanding and cooperation. The project advances international human resources through the participation of postdocs and a graduate student. The researchers plan to publish results of the research in scientific journals and report on the findings at scientific meetings.