Candidate revolving chiral doublet bands in Cs-119

Zheng, KK, Petrache, CM, Zhang, ZH, Astier, A, Lv, BF, Greenlees, PT, Grahn, T, Julin, R, Juutinen, S, Luoma, M
et al (show 25 more authors) (2022) Candidate revolving chiral doublet bands in Cs-119. EUROPEAN PHYSICAL JOURNAL A, 58 (3). 50-.

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Two rotational bands are identified in 119Cs, one of which having very similar pattern to that of the strongly-coupled πg9 / 2[404] 9 / 2 + band. The properties of the bands with similar patterns extracted from the experimental data are in agreement with a chiral interpretation. Tilted axis cranking covariant density functional theory with pairing correlations and particle-number conserving cranked shell model calculations are employed to determine the deformation and to investigate the band configurations, respectively. It results that the backbending is induced by the rotational alignment of two h11 / 2 protons, whose angular momenta reorient from the short to the intermediate axis, in a plane orthogonal to the angular momentum of the strongly-coupled g9 / 2 proton which keeps aligned along the long axis. The total spin points in 3D, inducing the breaking of the chiral symmetry. This is the first observation of candidate chiral bands built on a configuration with three protons, one in the strongly coupled [404] 9 / 2 + orbital which does not change orientation with increasing rotational frequency, and two in the h11 / 2 orbital which reorients to the rotation axis. The bands are observed in the transient backbending regime, showing that the chirality in nuclei is a general phenomenon, being robust and present not only in nuclei with nearly maximal triaxiality and pure configurations, but also in nuclei with moderate triaxiality and mixed configurations which gradually evolve from one to three-quasiparticle configurations, like in the backbending region.

Item Type: Article
Uncontrolled Keywords: Nuclear reaction:Ni-58(Zn-64, 3p)Cs-11(9), E=255 MeV, Measured gamma gamma gamma-coincidences, E-gamma, I-gamma, Anisotropy ratios, Angular distributions, Spin and parity, Model calculation
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 06 Apr 2022 13:23
Last Modified: 15 Mar 2024 00:43
DOI: 10.1140/epja/s10050-022-00704-y
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