The Tb-143 nucleus has been studied with the Mo-92 (Fe-54, 3p gamma) reaction at 240-MeV incident energy, extending the systematics of odd-A, N = 78 isotones to higher Z. For the yrast band, excited states up to a spin of 59/2(-) have been observed. The first allowed backbend occurs at a rotational frequency of (h) over bar omega = 0.38 MeV. Three- and five-quasiparticle structures were identified, similar to those seen in lower mass N = 78 isotones. Two of these structures have characteristics typical of mixed proton-neutron oblate configurations with one pair of aligned h(11/2) neutrons. In addition, two bands consisting of stretched E2 transitions have been observed with no known analogous structures in neighboring nuclei. The results are discussed in terms of the cranking model.
High-Spin State Spectroscopy in 143Tb
BRANDOLINI, FRANCO;LUNARDI, SANTO;SORAMEL, FRANCESCA;
1999
Abstract
The Tb-143 nucleus has been studied with the Mo-92 (Fe-54, 3p gamma) reaction at 240-MeV incident energy, extending the systematics of odd-A, N = 78 isotones to higher Z. For the yrast band, excited states up to a spin of 59/2(-) have been observed. The first allowed backbend occurs at a rotational frequency of (h) over bar omega = 0.38 MeV. Three- and five-quasiparticle structures were identified, similar to those seen in lower mass N = 78 isotones. Two of these structures have characteristics typical of mixed proton-neutron oblate configurations with one pair of aligned h(11/2) neutrons. In addition, two bands consisting of stretched E2 transitions have been observed with no known analogous structures in neighboring nuclei. The results are discussed in terms of the cranking model.
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