High spin states in {sup 162}Lu
- Department of Physics and Astrophysics, University of Delhi, Delhi-110007 (India)
- Nuclear Science Centre, Aruna Asaf Ali Marg, New Delhi-110067 (India)
An experimental investigation of the odd-odd {sup 162}Lu nucleus, following the {sup 148}Sm({sup 19}F,5n) reaction at beam energy E{sub lab}=112MeV, has been performed through in-beam gamma-ray spectroscopy. It revealed three signature-split bands. The yrast band based on {pi}h{sub 11/2}{circle_times}{nu}i{sub 13/2} configuration exhibits anomalous signature splitting (the unfavored signature Routhian lying lower than the favored one) whose magnitude {Delta}e{sup {prime}}{approx}25keV, is considerably reduced in contrast to sizable normal signature splitting {Delta}e{sup {prime}}{approx}125 and 60 keV observed in the yrast {pi}h{sub 11/2} bands of the neighboring odd-A {sup 161,163}Lu nuclei, respectively. The signature inversion in this band occurs at spin {approximately}20{h_bar} (frequency=0.37MeV). The second signature-split band, observed above the band crossing associated with the alignment of a pair of i{sub 13/2} quasineutrons, is a band based on the four-quasiparticle [{pi}h{sub 11/2}[523]7/2{sup {minus}}{circle_times}{nu}h{sub 9/2}[521]3/2{sup {minus}}{circle_times}({nu}i{sub 13/2}){sup 2}], i.e., EABA{sub p}(B{sub p}), configuration. The third signature-split band is also likely to be a four-quasiparticle band with configuration similar to the second band but involving F quasineutron, i.e., FABA{sub p}(B{sub p}). The experimental results are discussed in comparison with the existing data in the neighboring nuclei and in the framework of the cranking shell model. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 560775
- Journal Information:
- Physical Review, C, Vol. 56, Issue 3; Other Information: PBD: Sep 1997
- Country of Publication:
- United States
- Language:
- English
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