Excited states of the Pm-150 odd-odd nucleus

The knowledge of excited states in the odd-odd Pm-150, completely unknown until recently, is important both for understanding double beta decay of Nd-150 and for nuclear structure studies in mass regions with a quantum phase transition. A large number of excited states have been determined for the first time in this nucleus by measuring spectra of the Sm-152(d,alpha) direct reaction at 25 MeV with the Munich Q3D spectrograph and by gamma-ray spectroscopy with the (p, n gamma) reaction at 7.1 MeV at the Bucharest tandem accelerator. Some of these levels correspond to peaks recently observed with the (He-3,t) reaction at 140 MeV/u.