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Progress on tilted axis cranking covariant density functional theory for nuclear magnetic and antimagnetic rotation

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Frontiers of physics 2013年第1期8卷 55-79页

作者：孟杰彭婧张双全赵鹏巍 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 Department of Physics University of Stellenbosch Stellenbosch South Africa Department of Physics Beijing Normal University Beijing 100875 China

magnetic rotation and antimagnetic rotation are exotic rotational phenomena observed in weakly deformed or near-spherical nuclei, which are respectively interpreted in terms of the shears mechanism and two shearslike mechanism. Since their observations, magnetic rotation and antimagnetic rotation phenomena have been mainly investigated in the framework of tilted axis cranking based on the pairing plus quadrupole model. For the last decades, the covariant density functional theory and its extension have been proved to be successful in describing series of nuclear ground-states and excited states properties, including the binding energies, radii, single-particle spectra, resonance states, halo phenomena, magnetic moments, magnetic rotation, low-lying excitations, shape phase transitions, collective rotation and vibrations, etc. This review will mainly focus on the tilted axis cranking covariant density functional theory and its application for the magnetic rotation and antimagnetic rotation phenomena.

关键词： covariant density functional theory tilted axis cranking magnetic rotation antimagnetic rotation

Core breaking and possible magnetic rotation in the semimagic nucleus ^(90)Zr

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维普期刊数据库

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Chinese Physics C 2021年第9期45卷 180-187页

作者： Hao Wang Ke-Yan Ma Si-Ying Liu Jing-Bin Lu College of Physics Jilin UniversityChangchun 130012China

The semimagic nucleus^(90)Zr,with Z=40 and N=50,is investigated in terms of large scale shell model calculations.A logical agreement is obtained between the available experimental data and predicted *** calculated results indicate that the low-lying states are primarily dominated by the proton excitations from the fp orbitals across the Z=38 or 40 sub shell into the high-j 1g_(9/2)*** the higher-spin states of^(90)Zr,the breaking of the N=50 core plays a crucial role,and the contribution of different orbitals to each state are discussed in this *** evolution from neutron core excitations to proton excitations is systematically studied along the neighboring N=50 ***,the strongΔI=1 sequence demonstrates an abrupt backbend attributed to the alignment of the valence nucleons in fp proton orbitals and is proposed to have aπ(fp)^(-2)(1g_(9/2))^(2)■v(1g_(9/2))^(-1)(2d_(5/2)/1g_(7/2))^(1)configuration before the backbend,based on the shell model *** properties of this sequence before the backbend indicate a general agreement with the fingerprints of magnetic rotation;hence,the sequence with theπ(fp)^(-2)(1g_(9/2))^(2)■v(1g_(9/2))^(-1)(2d_(5/2)/1g_(7/2))^(1) configuration is suggested as a magnetic rotational band arising from shears mechanism.

关键词： semimagic nucleus shell model core breaking magnetic rotation

Quasi-Particle Alignment and magnetic rotation Investigated by g-Factor Measurements

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Quasi-Particle Alignment and Magnetic Rotation Investigated ...

Study of magnetic-rotation in ^(82)Rb byg-factor measurements

“创新——核科学技术发展的不竭源泉”——中国核学会2009年学术年会

作者： K.Matsuta M.Fukuda M.Mihara T.Minamisono Department of Physics Osaka UniversityToyonakaOsaka 560-0043Japan

Quasi-particle alignment and magnetic rotation are investigated at high spins in a mass region of A=80 by g-factor measurements using the TMF-IMPAD *** and/or neutron alignments are observed in Sr,Y,Zr,Zr and Zr,which lead to different patterns of variation of g-factor with *** the nuclides with Z=40 neutron ahgnment follows proton alignment in Zr and Zr,while proton alignment follows neutron alignment in *** the nuclides with N=44 proton aligns only in Sr,neutron alignment follows proton alignment in Y and *** measured g-factors and calculated shears angles decreases with the spin increasing along magnetic rotational band in Zr,revealing a step-by-step alignment of the valence protons and neutrons and providing unique evidence of the shears mechanism of magnetic rotation.

关键词： Quasi-particle alignment magnetic rotation g-factor TMF-IMPAD

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cnki会议

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Chinese Physics C 2009年第S1期33卷 188-190页

作者：袁大庆郑永男左翼范平周冬梅刘猛吴晓光竺礼华李广生许国基樊启文张锡珍朱升云 China Institute of Atomic Energy

magnetic rotation in 82Rb has been investigated for the first time by g-factor measurement of intra-band states of the magnetic-rotational band built on the 11- state. The g-factors were measured by a TMF-IMPAD method and calculated by a semi-classical model of independent particle angular momentum coupling assumption. The g-factors and deduced shears angles decrease with the increasing of spin along the band, illustrating a step-by-step alignment of the valence protons and neutrons. The rapid alignment of the valence neutrons leads to a decrease of g-factors. The present results vividly reveal the shears mechanism of magnetic rotation.

关键词： 82Rb magnetic rotation shears mechanism g-factor

Dramatic transition between electric and magnetic rotations in ^(106)Ag

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Science China(Physics,Mechanics & Astronomy) 2014年第9期57卷 1669-1675页

作者： ZHENG Yun ZHU LiHua CHEN YongShou WU XiaoGuang HE ChuangYe HAO Xin LIU Ying WANG ZhiMin LI XueQin LI GuangSheng GAO ZaoChun SUN HuiBin China Institute of Atomic Energy School of Physics and Nuclear Energy Engineering Beihang University Faculty of Science Shenzhen University School of Environmental and Biological Engineering Nanjing University of Science and Technology Nuclear and Radiation Safety Center Ministry of Environmental Protection

The lifetimes for the states of magnetic dipole band in106Ag have been measured using the Doppler-shift attenuation method via the reaction of100Mo(11B,5n)106Ag at a beam energy of 60 *** reduced transition strengths of the magnetic dipole band,the B(M1)/B(E2)ratios together with the signature of the level energy as a function of angular momentum for the positive parity states of106Ag show that a drastic change of excitation mode,that is,from electric rotation to magnetic rotation,occurs within one unit of spin at around Iπ=12+.Theoretical calculations based on the triaxial projected shell model consistently reproduce the experimental data and provide an explanation on the nature of observed phenomena such that the dynamical drift of the rotational axis suddenly from the principal axis to the tilted one,along the positive parity bands of106Ag.

关键词： lifetime measurements DSAM TPSM magnetic rotation electric rotation

Dipole bands in nucleus ^(139)Pm

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Chinese Physics C 2010年第4期34卷 456-459页

作者：张宁涛张玉虎周小红柳敏良郑勇郭应祥陈亮王世陶张昕竺礼华吴晓光 Institute of Modern Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences China Institute of Atomic Energy

High-spin states in nucleus ^139Pm have been studied using the reaction ^116Cd（^27Al, 4n）^139Pm. Two dipole cascades have been found. Spin and parity assignments were based on the Directional Correlation of Oriented Nuclei （DCO） ratios and systematic behavior in neighboring odd-proton nuclei. The level structures of ^139Pm are compared with those of the N = 78 isotone ^141Eu in which two dipole bands have been confirmed as magnetic rotational bands. The close similarity between them suggests that the dipole bands in ^139Pm may be magnetic rotational bands.

关键词： magnetic rotation soft nuclei driving force oblate shape

Shears mechanism in two-dimensional cranking relativistic mean field approach

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Chinese Physics C 2009年第S1期33卷 15-17页

作者：彭婧邢丽峰孟杰 Department of Physics Beijing Normal University 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

Using the new two-dimensional cranking relativistic mean field (RMF) approach, the shears mechanism of magnetic rotation based on configuration πh121/2νh-211/2 in 142Gd is microscopically and self-consistently exa... 详细信息

关键词： magnetic rotation relativistic mean field shears mechanism