STUDY OF HIGH-SPIN STATES IN THE NUCLEUS EU-149

In-beam studies of high-spin states in Eu-149 are reported. The level scheme extends up to an excitation energy of 7.1 MeV and a spin of 55/ 2HBAR. This nucleus is weakly deformed and most of the high-spin struc ture is interpreted through its multi-particle-hole nature. Octupole-p honon vibrations coupled to multi-particle-hole states are observed an d discussed. In contrast with the Z less-than-or-equal-to 62 isotones, there is no conclusive evidence in Eu-149 for octupole deformation in duced by rotation.