Acquisition of a High Efficiency Segmented Germanium Detector Array for Nuclear Structure Experiments with Exotic Beams

用于研究放射性核结构的专用设备将在密歇根州立大学国家超导回旋加速器实验室建造，该实验室目前是美国用于研究放射性核的主要设施。 该设备将包括一个锗探测器阵列，用于探测通过一种称为粒子束碎裂的技术产生的不稳定核的衰变伽马射线。 以这种方式产生的光束在实验室中具有很高的速度，因此，在不同方向发射的伽马射线在不同程度上发生多普勒频移，从而使总能量分辨率显著加宽。 这个阵列将允许这样的多普勒展宽去卷积，允许重要的高分辨率研究这些不稳定的核。 对这些核结构的研究将为我们理解核合成和其他恒星过程中重要的核和反应提供重要的投入，并将限制和测试核结构的理论工作。 远离稳定核的研究和核天体物理学是美国核科学的优先主题，由NSF/DOE联合核科学咨询委员会在其1996年长期计划中建立。 学生和博士后的教育是该设备将被使用的实验计划的重要组成部分。 通过多学科活动办公室提供资金，作为一项举措的一部分，该举措将扩大仪器支持方面的能力。

Specialized equipment for use in the study of the structure radioactive nuclei will be constructed at the Michigan State University National Superconducting Cyclotron Laboratory, presently the major US facility used in the study of radioactive nuclei. The equipment will consist of an array of germanium detectors for detecting decay gamma rays from unstable nuclei produced via a technique known as particle beam fragmentation. Beams produced in this fashion have a high velocity in the laboratory and the gamma rays emitted in different directions are thus Doppler shifted in a varied degree to the extent that the overall energy resolution is broadened dramatically. This array will permit such Doppler broadening to be deconvoluted, allowing important high resolution studies of these unstable nuclei. The study of the structure of these nuclei will provide important input to our understanding of nuclei and reactions of importance in nucleosynthesis and other stellar processes, and will constrain and test theoretical work in nuclear structure. The study of nuclei far from stability and nuclear astrophysics are topics of high priority within US nuclear science, as established by the joint NSF/DOE Nuclear Science Advisory Committee in its 1996 Long Range Plan. Education of students and postdocs is strong component of the experimental program in which this equipment will be used. Funding is provided through the Office of Multidisciplinary Activities as part of an initiative which will enable expansion of capabilities regarding instrumentation support.