Nuclear Structure Studies with 4 pi Detector Arrays

拟议研究计划的主要目标是利用两个主要的新放射性束流设施，即美国阿贡的ATLAS-CARIBU设施和加拿大TRIUMF的ISAC2设施，以探测远离稳定的富中子核未探索区域的不寻常核结构现象。第二个目标是探索导致长寿命高激发异构体状态存在的基本性质和潜在的核结构，并阐明实现异构体状态的受激去居群的可行性，以实现存储能量的可控释放，这可能具有广泛的应用前景。ATLAS的这个项目将利用罗切斯特4p重离子探测器CHICO，以及美国首屈一指的高分辨率伽马射线设备Gammasphere。罗彻斯特/LLNL的Bambino重离子探测器系统将与ISAC2上新的Tigress高分辨率跟踪伽马射线设备一起使用。CHICO和Bambino的重要发展，对Gammasphere的贡献，以及库仑激发、重离子诱导转移和裂变碎片光谱学技术，是罗切斯特多年努力的成果。克莱恩将继续参与GRETA的开发，这是下一代高分辨率伽马射线探测器技术，采用跟踪每个伽马射线相互作用的位置和能量的新概念。这种探测器将提供比目前可用的分辨率高几个数量级的能力，使目前核科学无法进行的研究成为可能。除了对核科学产生巨大影响外，这种伽马射线跟踪和成像探测器的潜在影响将对包括天体物理学、医学、工业和核保障在内的广泛应用产生相当大的影响。建议的研究项目将为研究生和博士后教育提供理想的环境。

The primary goals of the proposed research program are to exploit the two premier new radioactive beam facilities, namely the US ATLAS-CARIBU facility at Argonne, and the Canadian ISAC2 facility at TRIUMF, in order to probe unusual nuclear structure phenomena in unexplored regions of neutron-rich nuclei far from stability. A second goal is to explore the fundamental properties and underlying nuclear structure leading to the existence of long-lived highly-excited isomeric state and to elucidate the feasibility of achieving stimulated depopulation of isomeric states for controllable release of stored energy which could have broad applications. This program at ATLAS will exploit the Rochester 4p heavy-ion detector CHICO, plus Gammasphere, this nation's premier high-resolution gamma-ray facility. The Rochester/LLNL Bambino heavy-ion detector system will be used with the new Tigress high-resolution tracking gamma-ray facility at ISAC2. The important developments of CHICO and Bambino, contributions to Gammasphere, and the techniques of Coulomb excitation, heavy-ion induced transfer, and fission-fragment spectroscopy, are the culmination of many years of effort at Rochester. Cline will continue to be involved in the development of GRETA, the next generation high-resolution gamma-ray detector technology that employs the new concept of tracking the location and energy of every gamma-ray interaction. Such detectors will provide a resolving power that is orders of magnitude better than currently available, enabling studies that at present are inaccessible to nuclear science. Besides having an enormous impact on nuclear science, the potential impact of such gamma-ray tracking and imaging detectors will be considerable to a wide range of applications, including astrophysics, medicine, industry, and nuclear safeguards. The proposed research program will be an ideal environment for graduate and post-doctoral education.