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High-spin states in the doubly odd nucleus '"Pm have been studied via gamma-ray spectroscopic methods following the " Cd("A1,5ny) heavy-ion fusion-evaporation reaction. Several rotational bands have been populated in the nucleus. The yrast cascade is based on two signature components of the mh]l&2vh], &2 configuration. A sideband was observed, which is probably based on the sr[413]i+Svh"~i configuration. Similar rotational bands built on these configurations have been observed in the neighboring doubly odd " Pr and ' Pm nuclei. An additional AI=2 band structure, not observed in these other nuclei, has also been populated. At low rotational frequencies, this band is possibly based on the ith"~&IIv[400] -, '+ configuration. At a frequency fico 0 3-1 M. eV it is crossed by a band based on the favored signature of the~h»z& vi]3~, configuration with an accompanying gain in alignment of -6A.Recently at Stony Brook, the doubly odd ' La, Pr, and ' ' Pm nuclei have been studied. ' ' ' ' The present paper presents the results for Pm which is the heaviest of these nuclei. No information regarding the high-spin structure of ' Pm was avai1able before this work was carried out. The results are interpreted using cranked shell-model calculations. ' A preliminary report of the work has been presented. '

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