STUDY OF EXCITED-LEVELS IN PM-147

Excited states in Pm-147 have been studied through the Xe-136(N-15,4n) and Nd-148(d,3n) compound nucleus reactions. A solid xenon target has been used to populate high-spin states in Pm-147. Conversion coefficients of weak transitions were determined measuring electron-gamma coincidences, The half-life of the isomeric level at 649.3 keV has been remeasured to be 27 +/- 3 ns. An extended level scheme is proposed, which is discussed in terms of single-particle excitations and collective quadrupole and octupole vibrations coupled to them, The possible presence of octupole deformation is considered.