Abstract
An odd nucleon can be a sensitive probe of collective core structure, and thus studying the properties of odd-mass nuclei often give direct information on nuclear shapes. However, the available experimental information for the deformed odd-mass nuclei in the A=100 region is seriously limited in at least one respect: The lack of transition multipolarity measurements. As a result, spin and parity assignments have depended strongly on model considerations, and should be regarded with caution. Particle-rotor calculations (including E1, M1 and E2 transition rates) have been made for Y and Nb nuclei to study how much can be learned from the currently available data, and whether there is any evidence for triaxial shape.
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