Nuclear Structure Studies with 4pi Detector Arrays

0072362 Cline这项研究计划利用最强大的重离子加速器设施来探测原子核的结构。库仑激发被用来研究原子核的主要集体运动模式和双光子衰变。重离子诱导转移被用来探测单粒子和配对自由度以及填充丰中子核。裂变碎片谱用于填充高度丰中子的核。该研究主要集中在能源部支持的伽马射线阵列设施上;这是世界上首屈一指的用于核结构研究的4 π（全角度覆盖）伽马射线阵列设施。 罗切斯特4 π重离子探测器CHICO（紧凑型重离子计数器）大大扩展了伽马射线探测器的研究能力，使其成为该国家设施的重要组成部分。CHICO和伽马射线探测器的结合使其能够利用高倍伽马射线的符合，在选择性和灵敏度方面提供巨大的进步。CHICO的发展，对γ射线的贡献，以及库仑激发、重离子诱导转移和裂变技术，是罗切斯特多年努力的结晶。它们为核结构物理学的重大科学进展开辟了令人兴奋的新研究机会。此外，耶鲁-罗切斯特4 π伽马射线阵列，YRAST，这是耦合到耶鲁20 MV串列加速器，是一个强大的设施，用于补充研究计划在超额认购伽马射线设施。

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.