Nuclear Structure Studies with 4pi Detector Arrays

[00:23 . 62]克莱恩：这个研究项目利用最强大的重离子加速器设备来探测原子核的结构。库仑激发被用于研究原子核和双光子衰变的主导集体运动模式。重离子诱导转移用于探测单粒子和配对自由度以及填充富中子核。裂变碎片光谱是用来填充高中子富集的原子核的。研究主要集中在美国能源部支持的Gammasphere设施上；世界上首屈一指的4-pi（全角度覆盖）伽玛射线阵列核结构研究设施。罗切斯特4 π重离子探测器CHICO（紧凑型重离子计数器）极大地扩展了Gammasphere的研究能力，使其成为这个国家设施的重要组成部分。CHICO和Gammasphere的结合使得利用高倍伽马射线的巧合在选择性和灵敏度方面取得巨大进步成为可能。CHICO的发展，对Gammasphere和库仑激发、重离子诱导转移和裂变技术的贡献，是罗切斯特多年努力的成果。它们为在核结构物理方面取得重大科学进展开辟了令人兴奋的新研究机会。此外，耶鲁-罗彻斯特大学的4-pi伽马射线阵列（YRAST）与耶鲁大学的20MV串联加速器相连，是一个强大的设备，用于补充超额认购的Gammasphere设施的研究项目。

0072362Cline This research program exploits the most powerful heavy-ion accelerator facilities available to probe the structure of nuclei. Coulomb excitation is used to study the dominant collective modes of motion in nuclei and double-photon decay. Heavy-ion induced transfer is used to probe single-particle and pairing degrees of freedom as well as to populate neutron-rich nuclei. Fission-fragment spectroscopy is used to populate highly neutron-rich nuclei. The research is centered primarily on the DOE-supported Gammasphere facility; the world's premier 4-pi (full angular coverage) gamma-ray array facility for nuclear structure research. The Rochester 4-pi heavy-ion detector, CHICO (Compact Heavy Ion Counter), significantly expands the research capabilities of Gammasphere making it an important component of this national facility.The combination of CHICO and Gammasphere makes it viable to utilize coincidences of high-fold gamma-rays to provide an enormous advance in selectivity and sensitivity. The development of CHICO, contributions to Gammasphere and the techniques of Coulomb excitation, heavy-ion induced transfer, and fission, are the culmination of many years of effort at Rochester. They open exciting new research opportunities for making significant scientific advances in nuclear structure physics. In addition, the Yale-Rochester 4-pi gamma-ray array, YRAST, which is coupled to the Yale 20MV tandem accelerator, is a powerful facility that is used to complement the research program at the oversubscribed Gammasphere facility.