Decay of oriented149Nd and levels in theN=88149Pm nucleus

Levels in the¹⁴⁹Pm nucleus populated via¹⁴⁹Nd decay were studied using the low temperature nuclear orientation technique. The parent¹⁴⁹Nd nuclei were oriented in a gadolinium host. The normalized gamma-ray intensities were determined for twenty five transitions in the daughter¹⁴⁹Pm nucleus. The spins of the¹⁴⁹Pm levels at 288.2 and 425.3 keV were determined as 9/2 and 7/2, respectively, and for several other¹⁴⁹Pm levels the previous spin-assignments could be unambiguously confirmed. Substantial new information on multipole mixing ratios of gamma-transitions in¹⁴⁹Pm is presented. Low-energy level spacing in the¹⁴⁹Pm nucleus is found to be in reasonable agreement with recent particle-rotor model calculations including the variable moment of inertia.