Elsevier

Nuclear Physics A

Volume 396, 21 March 1983, Pages 319-328
Nuclear Physics A

Evolution of nuclear shapes in 157–161yb as a function of spin and neutron number

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Abstract

The population distributions of the entry states, the entry lines 〈E> versus multiplicity, the energy spectra and the angular distributions of the continuum γ-rays as a function of multiplicity in 157–161yb from the reactions of 136 MeV and 149 MeV 20Ne with 144Nd and 146Nd have been investigated with a 4π multidetector system gated with a Ge detector. The observed entry lines and γ-decay modes indicate changes in the nuclear structure with increasing spin. This systematic change for N = 87– 91 Yb isotopes suggests an evolution of nuclear shapes from prolate at low spins to particle aligned oblate structure for 157yb and 158yb followed by the onset of high-K bands built on largely deformed oblate states at increasingly higher spin between 38 and 50 kh with increasing neutron number for 157–161yb. Furthermore evidence for an evolution to triaxial shape at I ⋍ 50 for 158yb was found.

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    Present address: Department of Physics, University of Jyväskylä, Jyväskylä, Finland.

    ∗∗

    Present address: Department of Physics, University of Münich, Münich, West Germany.

    Oak Ridge Associated Universities Research Participant on leave from St. Louis University, St. Louis, MO 63103. Present address: South Carolina Electric and Gas Company, Columbia, SC 29218.

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