Abstract
Experimentally observed energy levels for odd-odd nuclei with 87 ≤ Z ≤ 103 and 129 ≤ N ≤ 159 are classified in terms of their intrinsic structures and associated rotational bands. Distinctive level patterns for different nuclear shapes are discussed. Parity-mixed level structures indicative of reflection-asymmetric (octupole-deformed) shapes are seen in N < 139 nuclides. For well-deformed nuclei, long-lived (t1/2 ≥ 1 s) isomer pairs are observed in several cases with no isomeric transition connecting the two isomers. Systematics of residual interaction effects, e.g., Gallagher-Moszkowski splittings and Newby shifts, are studied and features of interaction matrix elements are examined. Our literature cutoff date is September 1993.
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