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

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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.