RUI: Experimental Studies of N=Z Nuclei Near 72Kr

RUI：72Kr 附近 N=Z 原子核的实验研究

• 批准号: 0244895
• 负责人: Susan Fischer
• 金额: --
• 依托单位: DePaul University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0244895&HistoricalAwards=false
• 关键词: RUI; Experimental; Studies; N=Z; Nuclei

Nuclei with equal numbers of neutrons and protons near 72Kr provideinteresting and important tests of nuclear theory, as they can supply information onthe interaction of neutron-proton (np) pairs, and test our understanding of the evolutionof nuclear shape. Recently, two possible consequences of np pairing have been offered: adelay in the rotational frequency at which nucleon pairs break and align with theangular momentum of the core, and the apparent low level density of odd-odd N=Z nuclei.The primary focus of this work is the collection, analysis and interpretation of data onlow-spin states in the odd-odd nuclei 74Rb and 88Y, of which little or nothing is known. Theexperiments will be carried out at Argonne National Laboratory (ANL) using theGammasphere array, an array of neutron detectors, and the Argonne Fragment Mass Analyzer(FMA). A secondary focus of this work is on studies of the nucleus 72Kr,including a low-spin experiment using the Gammasphere array coupled to the FMA. The goal ofthis experiment is to observe and characterize the states at low excitationenergy and angular momentum, including the expected continuation of an oblate band thathas remained elusive through the years. This work will be done with the support oftwo undergraduate research assistants who will have the opportunity to participate in thesetup of experiments, and the collection and analysis of the data.

在72 Kr附近具有相同数量的中子和质子的原子核提供了有趣而重要的核理论测试，因为它们可以提供关于中子-质子（np）对相互作用的信息，并测试我们对核形状演化的理解。近年来，人们提出了np配对的两种可能结果：核子对断裂并与核角动量成直线的转动频率延迟，以及奇-奇N=Z核的明显低能级密度.本文的主要工作是收集、分析和解释奇-奇核74 Rb和88 Y的低自旋态数据，这些数据是我们所知甚少或一无所知的. 实验将在阿贡国家实验室（ANL）进行，使用γ射线阵列，中子探测器阵列，和阿贡碎片质量分析仪（FMA）。 这项工作的第二个重点是对原子核72 Kr的研究，包括使用耦合到FMA的γ射线阵列进行的低自旋实验。 这个实验的目标是观察和表征低激发能和角动量的状态，包括多年来一直难以捉摸的扁圆带的预期延续。 这项工作将在两名本科生研究助理的支持下完成，他们将有机会参与实验的安排，以及数据的收集和分析。