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Evolution of chirality from γ soft Ru to triaxial Ru
Authors:YX Luo  SJ Zhu  JH Hamilton  JO Rasmussen  AV Ramayya  C Goodin  K Li  JK Hwang  D Almehed  S Frauendorf  V Dimitrov  Jing-ye Zhang  XL Che  Z Jang  I Stefanescu  A Gelberg  GM Ter-Akopian  AV Daniel  MA Stoyer  R Donangelo  JD Cole  NJ Stone  
Abstract:Rotational bands in 108,110,112Ru have been investigated by means of γγγ and γγ(θ) coincidences of prompt γ rays emitted in the spontaneous fission of 252Cf. The positive parity bands are described by different versions of IBA, where 108Ru is best described as a γ-soft nucleus whereas 110,112Ru are more like rigid triaxial rotors. New ΔI=1 negative parity doublet bands are found. In case of 110,112Ru, these are interpreted as soft chiral vibrations. Many of the experimental findings can be explained by microscopic calculations that combine the TAC mean-field with random phase approximation but a simple geometrical explanation is not apparent.
Keywords:Chiral vibration  108  110  112Ru  Spontaneous fission of 252Cf
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