Abstract
The N=90 rare earth nucleus 154Gd has been studied in the spin regime of I<or=26h(cross) by using the reaction 150Nd(9Be, 5n)154Gd at 55 MeV. Gamma-gamma coincidence and angular correlation data were obtained using the TESSA2 array. Two positive parity sequences have been extended to 26+ and four negative parity structures have each been observed up to spins of I=22-24h(cross). The rotational structures observed in 154Gd are interpreted within the framework of the cranked shell model (CSM) in terms of quasiparticle excitations. The characteristics of the rotational band sequences and the band crossings that occur are compared with those in neighbouring nuclei and to the predictions of this model. The first, second and third i13/2 neutron alignments in 154Gd and the systematics of the neutron alignments in the negative parity rotational bands in the even-even N=90 nuclei are discussed. Evidence for quasiproton excitations at the highest spins is discussed.
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