Evidence for Shape Co-existence at medium spin in 76Rb
R. Wadsworth, I. Ragnarsson, B.G. Carlsson, Hai-Liang Ma, P.J. Davies,, C. Andreoiu, R.A.E. Austin, M.P. Carpenter, D. Dashdorj, S.J. Freeman, P.E., Garrett, J. Greene, A. G\"orgen, D.G. Jenkins, F. Johnston-Theasby, P. Joshi,, A.O. Macchiavelli, F. Moore, G. Mukherjee
TL;DR
This study extends known rotational bands in 76Rb to medium spins, revealing evidence of shape co-existence with near-oblate and near-prolate configurations, supported by experimental data and theoretical modeling.
Contribution
It provides the first experimental evidence of shape co-existence at medium spins in 76Rb, supported by detailed gamma-ray spectroscopy and Cranked Nilsson-Strutinsky calculations.
Findings
Identification of extended rotational bands in 76Rb
Evidence of shape co-existence at medium spins
Different shapes associated with similar configurations
Abstract
Four previously known rotational bands in 76Rb have been extended to moderate spins using the Gammasphere and Microball gamma ray and charged particle detector arrays and the 40Ca(40Ca,3pn) reaction at a beam energy of 165 MeV. The properties of two of the negative-parity bands can only readily be interpreted in terms of the highly successful Cranked Nilsson-Strutinsky model calculations if they have the same configuration in terms of the number of g9/2 particles, but they result from different nuclear shapes (one near-oblate and the other near-prolate). These data appear to constitute a unique example of shape co-existing structures at medium spins.
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