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electromagnetic transitions in multiple chiral doublet bands

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Chinese Physics C 2016年第12期40卷 91-98页

作者： Hui Jia Bin Qi Shou-Yu Wang Shuo Wang Chen Liu Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space Sciences Shandong University Weihai 264209 China

Multiple chiral doublet bands （MχD） in the 80, 130 and 190 mass regions are studied by the model of γ=90°triaxial rotor coupled with identical symmetric proton-neutron configurations. By selecting a suitable basis, the calculated wave functions are explicitly exhibited to be symmetric under the operator A, which is defined as rotation by 90° about the 3-axis with the exchange of valance proton and neutron. We found that both M1 and E2 transitions are allowed between levels with different values of A, while they are forbidden between levels with same values of A. Such a selection rule holds true for MχD in different mass regions.

关键词： chiral doublet bands electromagnetic transition selection rule particle rotor model

Spectra and electromagnetic transitions of ^(72-84)Kr in the interacting boson model-1

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Chinese Physics C 2016年第7期40卷 68-72页

作者：白洪波李晓伟吕立君董鸿飞王印张进富 College of Physics and Electronic Information Engineering Chifeng University Chifeng 024001 China

Within the framework of the interacting boson model- 1, the energy levels and electromagnetic transitions in 72-84Kr isotopes are calculated. The structures of the eigenstate and Hamiltonian matrix for some low-lying states are also calculated. The calculated results are compared with available experimental data, and the results are generally in good agreement. The present study shows that the 72,74,76,80,82,84Kr isotopes are in the transition from U（5）→ SU（3）, and 7SKr is in the transition from U（5）→ O（6）.

关键词： even-even Kr nuclei spectra electromagnetic transition the interacting boson model-1

Low-lying spectra and E2 transition rates in ^(160-170)Er isotopes in the interaction boson model

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Chinese Physics C 2009年第S1期33卷 27-29页

作者：张进富吕立君 Department of Physics Chifeng University

Spectra and E2 transition rates for the 160-170Er isotopes are studied in the framework of the interaction boson model. A schematic Hamiltonian able to describe their spectra and B(E2) transition is used. It is found ... 详细信息

关键词： spectra electromagnetic transition positive parity collective state

Chiral doublet bands and energy-level crossing

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Chinese Physics C 2009年第S1期33卷 43-45页

作者：亓斌孟杰张双全王守宇彭婧 School of Physics and SK Lab. of Nucl. Phys. & Tech. Peking University Institute of Theoretical Physics Chinese Academy of Sciences Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Department of Physics University of Stellenbosch Stellenbosch South Africa Department of Space Science and Applied Physics Shandong University at Weihai Department of Physics Beijing Normal University

Different definitions for chiral doublet bands based on excitation energies, B(E2) and B(M1) respectively are discussed in the triaxial particle rotor model. For the ideal chiral geometry, the selection rules of the electromagnetic transitions in different band definitions are illustrated. It is also shown that the energy-level crossings between chiral doublet bands may occur.

关键词： chiral doublet bands band definition electromagnetic transition energy-level crossing triaxial particle rotor model

πg_(9/2)νh_(11/2) doublet bands in A～100 mass region

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Chinese Physics C 2009年第S1期33卷 37-39页

作者：王守宇张双全亓斌孟杰 Department of Space Science and Applied Physics Shandong University at Weihai School of Physics and SK Lab. of Nucl. Phys. & Tech. Peking University Institute of Theoretical Physics Chinese Academy of Science Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Department of Physics University of Stellenbosch StellenboschSouth Africa

Using the model with one particle and one hole coupled with a triaxial rotor, the πg9/2/1/2νh11/2 doublet bands in the A～100 mass region are studied, and compared with the πg9/2/1/2νh11/2 doublet bands. It is found that the calculated results for the configuration of πg9/2/1/2νh11/2 are very similar the results for a pure h11/2 proton particle and a neutron quasiparticle with λn = ε5. After including the pair correlation, the model describes the candidate chiral doublet bands in 106Rh successfully, which supports the interpretation of chirality geometry.

关键词： chiral doublet bands electromagnetic transition triaxial particle rotor model