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，即位于Argonne的美国ATLAS-Cariu设施和位于TRIUMF的加拿大ISAC2设施，以探索远离稳定的丰中子核的未探测区域中的异常核结构现象。第二个目标是探索导致长寿命高激发异构态存在的基本性质和潜在的核结构，并阐明实现异构态受激去布居以可控地释放储存能量的可行性，这可能具有广泛的应用。ATLAS的这个项目将利用罗切斯特4P重离子探测器CHICO，加上美国首屈一指的高分辨率伽马射线设施伽马斯球。罗切斯特/LLNL班比诺重离子探测器系统将与ISAC2的新的Tigress高分辨率跟踪伽马射线设施一起使用。奇科和班比诺的重要发展，对伽马斯层的贡献，以及库仑激发、重离子诱导转移和裂变碎片光谱技术，都是罗切斯特多年来努力的结果。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，采用了跟踪每一次伽马射线相互作用的位置和能量的新概念。这样的探测器将提供比目前可用的分辨率高出几个数量级的分辨率，使目前核科学无法获得的研究成为可能。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、医学、工业和核保障在内的广泛应用产生相当大的影响。拟议的研究计划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.