Multiple chiral doublet bands with octupole correlations in reflection-asymmetric triaxial particle rotor model

Wang, Y.Y. (School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191, China) ; Zhang, S.Q. (State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing, 100871, China) ; Zhao, P.W.  (State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing, 100871, China) ; Meng, J.  (State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing, 100871, China) (School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191, China) (Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto, 606-8502, Japan)

10 April 2019

Abstract: A reflection-asymmetric triaxial particle rotor model (RAT-PRM) with a quasi-proton and a quasi-neutron coupled with a reflection-asymmetric triaxial rotor is developed and applied to investigate the multiple chiral doublet (M χ D) bands candidates with octupole correlations in 78 Br. The calculated excited energies, energy staggering parameters, and B(M1)/B(E2) ratios are in a reasonable agreement with the data of the chiral doublet bands with positive- and negative-parity. It is found that both the triaxial deformation γ and octupole deformation β3 influence the calculated B(E1) values. The chiral geometry based on the angular momenta for the rotor, the valence proton and valence neutron is discussed in details.


Published in: Physics letters B 792 (2019) 454-460
Published by: Elsevier
DOI: 10.1016/j.physletb.2019.04.014
License: CC-BY-3.0



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