HIGH-SPIN STATES IN LU-162

An experimental investigation of the odd-odd Lu-62 nucleus, following the Sm-148(F-19,5n) reaction at beam energy E-lab=112 MeV, has been pe rformed through in-beam gamma-ray spectroscopy. It revealed three sign ature-split bands. The yrast band based on pi h(11/2)x nu i(13/2) conf iguration exhibits anomalous signature splitting (the unfavored signat ure Routhian lying lower than the favored one) whose magnitude Delta e 'approximate to 25 keV, is considerably reduced in contrast to sizable normal signature splitting Delta e' approximate to 125 and 60 keV obs erved in the yrast pi h(11/2) bands of the neighboring odd-A Lu-161,Lu -163 nuclei, respectively. The signature inversion in this band occurs at spin similar to 20 (h) over bar (frequency=0.37 MeV). The second s ignature-split band, observed above the band crossing associated with the alignment of a pair of i(13/2) quasineutrons, is a band based on t he four-quasiparticle [pi h(11/2)[523]7/2(-)x nu h(9/2)[521]3/2(-)x(nu i(13/2))(2)], i.e., EABA(p)(B-p), configuration. The third signature- split band is also likely to be a four-quasiparticle band with configu ration similar to the second band but involving F quasineutron, i.e., FABA(p)(B-p). The experimental results are discussed in comparison wit h the existing data in the neighboring nuclei and in the framework of the cranking shell model.