[en] Progress on the research on our AT-(40-1)-2434 Contract is summarized for the twelve month contract year beginning October 1, 1974, and ending September 30, 1975. The main emphasis of our research continues to be an experimental study of nuclear models. Some change of emphasis is occurring. In the past, the emphasis has been overwhelmingly nuclear reaction spectroscopy and comparison with theoretical models. This year an increasing percentage of the emphasis (perhaps 25 percent) is on the study of nuclear structure from the view point of muonic x-ray spectroscopy. A list of publications is included. (U.S.)

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[en] Progress is reported in both theoretical and experimental nuclear physics. Experimental work has focused on the nuclear resonance spectroscopy of odd-odd deformed nuclei such as Tm-168, Lu-174, and Lu-176. In addition, the levels in Er-169 have been studied and detailed Coriolis coupling calculations have been done. Theoretical work has included the study of new collective modes so far not experimentally identified by presumably capable of being identified, rotational energy systematics using the generator coordinate method with particular emphasis on transitional nuclei, the relationship between the cluster model and the shell model as applied to the spectroscopy of Oxygen-16, and the importance of the deformed spin orbit potential for Nilsson model calculations. Additional research has concerned metal-metal stretching frequencies in the polymetallic carbonyls and on the crystal structure and the nuclear resonance spectroscopy of dirhenium decacarbonyl

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[en] The Nilsson-Strutinsky formalism has been applied to the calculation of potential energy functions of states of a number of p- and sd-shell nuclei. Simularities between the spin trajectories of these light nuclei and heavier (rare earth) nuclei are presented. Exotic effects (shape change, band termination and rotational isomerism) are predicted at high but easily accessible spins in the light nuclei. Comparisons between experiment and theory are made for ¹⁶O, ²⁰Ne, ²²Ne and ²⁴Mg. (author)

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[en] Octupole deformation has been observed for the first time in the detailed spectroscopy of an odd-odd nucleus in ¹⁵⁴Eu. 15 parity doublet bands or band heads are observed including most of the known levels below 600 keV. E1 transition probabilities are enhanced by ≅ 10² compared to the normal transitions in ¹⁵⁴Eu. (orig.)