Evidence for a Prolate to Oblate Shape Change at High Spin in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Yb</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>160</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

M. Jääskeläinen; D. G. Sarantites; R. Woodward; F. A. Dilmanian; H. Puchta; J. R. Beene; J. Hattula; M. L. Halbert; D. C. Hensley; J. H. Barker

doi:10.1103/PhysRevLett.49.1387

Evidence for a Prolate to Oblate Shape Change at High Spin in ${}^{160}{Yb}$

M. Jääskeläinen, D. G. Sarantites, R. Woodward, F. A. Dilmanian, H. Puchta, J. R. Beene, J. Hattula, M. L. Halbert, D. C. Hensley, and J. H. Barker

Phys. Rev. Lett. 49, 1387 – Published 8 November 1982

Abstract

The population and the decay properties of the entry states in ${}^{160}{Yb}$ have been investigated via the reactions of 136- and 149-MeV ${}^{20}{Ne}$ with ${}^{146}{Nd}$ with use of a $4 π$ $γ$ -ray multidetector system gated by a Ge counter for exit channel selection. A sudden decrease in the slope of the entry line accompanied by a change in the structure of the $γ$ -ray spectrum is observed at multiplicity $M_{γ} = 25$ . These changes indicate that a sudden transition from a prolate to an oblate shape occurs over a narrow range of spin above $45 ℏ$ .

Received 3 May 1982

DOI:https://doi.org/10.1103/PhysRevLett.49.1387

Authors & Affiliations

M. Jääskeläinen^*, D. G. Sarantites, R. Woodward, F. A. Dilmanian, and H. Puchta

Department of Chemistry, Washington University, St. Louis, Missouri 63130

J. R. Beene, J. Hattula^*, M. L. Halbert, D. C. Hensley, and J. H. Barker^†

Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

^*Present address: Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
^†Present address: South Carolina Electric & Gas Company, Columbia, S.C. 29218.