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The Influence of Triaxiality Parameter γ on the chiral doublet bands with (πg_(9/2))～(-1)(νh_(11/2))～2 Configuration

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Plasma Science and Technology 2012年第7期14卷 595-597页

作者：亓斌王守宇赵兴言祝笑颖孙大鹏刘晨徐长江 Shandong Provincial Key Laboratory of Optical Astronomy & Solar-Terrestrial Environ-ment School of Space Science and PhysicsShandong University at Weihai

The chiral doublet bands with three-quasiparticle configuration （πg9/2）-1 （vh11/2）2 are studied by the fully quantal triaxial particle rotor model. The energy spectra and B（M1）/B（E2） ratios of the doublet bands with different triaxiality parameter γ are systematically analyzed. It is found that γ is a sensitive parameter for the properties of these doublet bands.

关键词： chiral doublet bands triaxiality parameter three-quasiparticle configuration

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

Description of the candidate chiral doublet bands in ^(98)Tc

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Chinese Physics C 2012年第10期36卷 958-963页

作者：亓斌张盼张靖付捷李昱琪宋鹤鹤王守宇 School of Space Science and Physics Shandong University at Weihai

The candidate chiral doublet bands in 98 Tc with configuration πg9/2νh11/2 are studied the- oretically for the first time via the triaxial particle rotor model. The main properties of the doublet bands including the energy spectra and electromagnetic transitions are calculated for different triaxiality parameter γ, and the data in 98Tc can be well described by the calculations with γ = 38°. Based on the analysis of angular momentum components, it is found that the chiral rotational geometry in 98Tc deviates from the ideal chiral picture.

关键词： chiral doublet bands 98Tc particle rotor model

Recent progress in multiple chiral doublet bands

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Chinese Physics C 2020年第11期44卷 14-21页

作者： Shou-Yu Wang Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment School of Space Science and PhysicsInstitute of Space SciencesShandong UniversityWeihai 264209China

Recent progress regarding multiple chiral doublet bands(MχD)is reviewed from the experimental and theoretical *** particular,the experimental findings,theoretical predictions,selection rule for electromagnetic transitions,MχD with octupole correlations,and some related topics are *** on these discussions,it is of great scientific interest to search for the other MχD,as well as possible chiral wobblers,chirality-parity quartet bands,and chirality-pseudospin triplet(or quartet)bands in the nuclear system.

关键词： chiral doublet bands octupole correlations chirality-parity quartet bands

doublet bands at borders of A ≈ 130 island of chiral candidates: Case study of 120I

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Chinese Physics C 2020年第7期44卷 95-102页

作者： Rui Guo Yong-Hao Liu Jian Li Wu-Ji Sun Li Li Ying-Jun Ma College of Physics Jilin UniversityChangchun 130012China Department of Physics Western Michigan UniversityKalamazooMI 4900&USA

Positive-parity doublet bands were reported in *** on these,we discuss the corresponding experimental characteristics,including rotational alignment,and re-examine the corresponding configuration *** self-consistent tilted axis cranking relativistic mean-field calculations indicate that the doublet bands are built on the configurationπh11/2νh11/2^-*** adopting the two quasiparticles coupled with a triaxial rotor model,the excitation energies,energy staggering parameter S(I),B(M1)/B(E2),effective angles,and K plots are discussed and compared with available *** obtained results support the interpretation of chiral doublet bands for the positive-parity doublet bands in 120I,and hence identify this nucleus as the border of the A≈130 island of chiral candidates.

关键词： chiral doublet bands particle rotor model cranking relativistic mean-field theory high-j particle hole configuration

Possible candidate nuclei for chirality-parity quartet bands

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Chinese Physics C 2018年第7期42卷 82-88页

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

The potential energy surfaces of the even-even 68-92Se, 112-150Ba, and 208-230Ra isotopes are calculated using the macroscopic-microscopic method in a multidimensional space {αλ,μ} including quadrupole （λ=2, μ=0, 2） and octupole （λ=3, μ=0, 1, 2, 3） degrees of freedom. The calculated results show that the even-even isotopes 92Se, 112,114,144-150Ba and 220-228Ra can exhibit the coexistence of triaxial and octupole deformations, thereby leading to simultaneous chiral and reflected symmetry breaking. Therefore, chirality-parity quartet bands are expected in these and their neighboring odd-A/odd-odd nuclei.

关键词： chiral doublet bands shape coexistence chirality-parity quartet bands macroscopic-microscopic method

Search for chiral bands in A～110 neutron-rich nuclei

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Chinese Physics C 2009年第S1期33卷 145-147页

作者：朱胜江 J. H. Hamilton A. V. Ramayya J. K. Hwang J. O. Rasmussen 王建国车兴来丁怀博 S. Frauendorf V. Dimitrov 徐强顾龙杨韵颐 Department of Physics Tsinghua University Department of Physics Vanderbilt University Lawrence Berkeley National Laboratory Physics Department Notre Dame University

High spin states in A～110 neutron-rich 106Mo, 110Ru and 112Ru nuclei have been reinvestigated by measuring the prompt γ-rays from the spontaneous fission of 252Cf. Two similar sets of bands are observed to high spins in each of three nuclei. Through analyzing of characters of the band structures, the chiral doublet bands are suggested in 106Mo, 110Ru and 112Ru.

关键词： nuclear structure high spin states triaxiality chiral doublet bands

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