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Calculation of triaxial superdeformation in ^(174)Hf

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Science china(physics,Mechanics & Astronomy) 2007年第5期50卷 553-557页

作者： YU ShaoYing1,2,4, LI XiaoWei2, SHEN CaiWan1,5 & CHEN YongShou3,4 1 School of Science, Huzhou Teachers College, Huzhou 313000, china 2 College of Mathematics, physics and Information Engineering, Zhejiang Normal University, Jinhua 321000, china 3 china institute of Atomic Energy, beijing 102413, china 4 institute of theoretical physics, chinese academy of sciences, beijing 100080, china 5 Center of theoretical Nuclear physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, china 1. School of Science Huzhou Teachers College Huzhou 313000 China 2. College of Mathematics Physics and Information Engineering Zhejiang Normal University Jinhua 321000 China 4. institute of theoretical physics Chinese Academy of Sciences Beijing 100080 China 5. Center of theoretical Nuclear physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China 3. china institute of Atomic Energy Beijing 102413 China

A two-dimensional Total Routhian Surface (TRS) calculation with the fixed hexa- decapole deformation ε4 = 0.03 was carried out for several configurations of 174Hf. Results indicate that the shell corrections have an important contribution to the formation of triaxial superdeformation in 174Hf and some possible configuration assignments are made to the 4 TSD bands experimentally found in 174Hf.

关键词： Total Routhian Surface (TRS), triaxial superdeformation, configuration

Further research on high-spin structure in ^(161)Lu

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Science china(physics,Mechanics & Astronomy) 2008年第3期51卷 315-320页

作者： LI YanXia1,2,YU ShaoYing1,2,4,SHEN CaiWan1,5,LI XiaoWei6 & CHEN YongShou3,4 1 School of Science,Huzhou Teachers College,Huzhou 313000,china 2 College of Mathematics,physics and Information Engineering,Zhejiang Normal University,Jinhua 321000,china 3 china institute of Atomic Energy,beijing 102413,china 4 institute of theoretical physics,chinese academy of sciences,beijing 100080,china 5 Center of theoretical Nuclear physics,National Laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 730000,china 6 Department of physics,Chifeng University,Chifeng 024001,china School of Science Huzhou Teachers College Huzhou 313000 China College of Mathematics Physics Information Engineering Zhejiang Normal University Jinhua 321000 China china institute of Atomic Energy Beijing 102413 China institute of theoretical physics Chinese Academy of Sciences Beijing 100080 China Center of theoretical Nuclear physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China Department of physics Chifeng University Chifeng 024001 China

The two-dimensional total routhian surface (TRS) calculations were performed to probe into the triaxial superdeformed characteristics of a strongly populated band X2 in 161Lu. This band was identified as a triaxial superdeformed band by using our TRS method. We also got its formation mechanics,i.e. the neutron-shell correction energy plays a crucial role,while the rotating energy and the deformation-driving effect of high j intruder orbit i13/2 also play an additional role.

关键词： TRS method triaxial superdeformation formation mechanism

Re-study of Nucleon Pole Contribution in J/ψ→N(?)π Decay

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Communications in theoretical physics 2006年第9期46卷 507-513页

作者： ZONG Yuan-Yuan,~(1,2) SHEN Peng-Nian,~(1,3,4) ZOU Bing-Song,~(1,3,4) LIU Ji-Feng,~2 LIANG Wei-Hong~2 1 institute of High Energy physics, the chinese academy of sciences, P.O. Box 918(4), beijing 100049, china 2 Department of physics, Guangxi Normal University, Guilin 541004, china 3 Center of theoretical Nuclear physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, china 4 institute of theoretical physics, the chinese academy of sciences, beijing 100080, china institute of High Energy physics the Chinese Academy of Sciences P.O. Box 9184 Beijing 100049 Department of physics Guangxi Normal University Guilin 541004

We re-study nucleon pole contribution in J/ψ→NNπ decays by including the imaginary part for the propagator of the off-shell nucleon with energy above πN threshold. It is found that when including the imaginary part in the propagator, the branching ratio of the decay width will descend about 11% compared with the result without including the imaginary part, no matter whether including the off-shell form factors or not. It also leads to a phase of up to 25° for the off-shell nucleon propagator at invariant mass around 1400 MeV. This effect needs to be considered for detailed partial wave analysis of N* resonances around this mass region.

关键词： J/ψ decay form factor

Collective Rotational Bands in Transfermium Nuclei

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Collective Rotational Bands in Transfermium Nuclei

第十三届全国核结构研讨会暨第九次全国“核结构与量子力学”专题讨论会

作者： Xiao-tao He~(1 1)) Zhong-zhou Ren~2 Shu-xin Liu~3 En-guang Zhao~4 Jin-yan Zeng~3 1(College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,china) 2(Department of physics,Nanjing University,Nanjing 210093,china) 3(School of physics,Peking University,beijing 100871,china) 4(institute of theoretical physics,chinese academy of sciences,beijing 100080,china)

Rotational bands in even-even nuclei Fm,No,No and odd-A nuclei No, Md are studied by the cranked shell model with particle-number conserving treatment for monopole and quadrupole pairing *** bands are reproduced very well by theoretical results.A backbending of kinematic moment of inertia（?） is predicted at（?）≈0.275,0.300 MeV,0.275 MeV in bands of No,No and No,*** detailed information about the contribution to alignment from each cranked single particle level exhibits that the backbendings in No,No are mainly due to the rapidly aligned angular momentum of proton 1j[770]1/2 pairs and neutron 2h[761]3/2,1j[734]9/2 pairs the band crossing,and that in No is attributed to the simultaneous alignment of neutron 2h（1/2[761]） and proton 1j（1/2[770]） *** one signature band was observed in *** predict its signature partner band with a sharp backbending at very low frequency of（?）w≈0.15 *** of（?） in Md are the consequence of crossing between the proton 1/2[521]and 1/2[770]*** sudden rise of（?） is mainly due to the large alignment of proton 1/2[770]pair.

关键词： High-j intruder orbital Transfermium nuclei Backbending Cranked shell model Moment of inertia

来源： cnki会议评论

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cnki会议

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B_c Meson Studies

高能物理与核物理 2002年第Z1期26卷 1-10页

作者： CHANG Chao-Hsi (institute of theoretical physics, chinese academy of sciences, beijing 100080, china) Inst. of Theor. Phys. Chinese Acad. of Sci. Beijing 100080 China

Our studies on the meson Bc arc briefly *** decays of the meson Bc to a P-wave charmonium Xc or hc are reported comparatively precisely because they are fresh

关键词：高能物理核物理增刊张肇西 B_c Meson Studies Rev

Stability of proton and maximally symmetric minimal unification model for basic forces and building blocks of matter

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Science china(physics,Mechanics & Astronomy) 2007年第3期50卷 303-310页

作者： WU YueLiang institute of theoretical physics, chinese academy of sciences, beijing 100080, china 1. institute of theoretical physics Chinese Academy of Sciences Beijing 100080 China

With the hypothesis that all independent degrees of freedom of basic building blocks should be treated equally on the same footing and correlated by a possible maximal symmetry, we arrive at a 4-dimensional space-time unification model. In this model the basic building blocks are Majorana fermions in the spinor repre- sentation of 14-dimensional quantum space-time with a gauge symmetry GM4D = SO(1,3)×SU(32)×U(1)A×SU(3)F. The model leads to new physics including mirror particles of the standard model. It enables us to issue some fundamental questions that include: why our living space-time is 4-dimensional, why parity is not con- served in our world, how the stability of proton is, what the origin of CP violation is and what the dark matter can be.

关键词： gauge symmetry space-time symmetries beyond standard model and unification

Cyclic Heating-Annealing and Boltzmann Distribution of Free Energies in a Spin-Glass System

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Communications in theoretical physics 2007年第7期48卷 179-182页

作者： ZHOU Hai-Jun institute of theoretical physics,the chinese academy of sciences,beijing 100080,china institute of theoretical physics the Chinese Academy of Sciences Beijing 100080 China

Ergodicity of a spin-glass is broken at low temperatures;the system is trapped in one of many ergodicconfigurational *** between different ergodic domains are achievable through a *** this experiment is repeated infinite times,all ergodic configurational domains will be visited with frequencesthat decreasing exponentially with their free *** mean free energy density of a spin-glass system on a randomgraph is calculated based on this free energy Boltzmann distribution in the present work,by means of the cavity approach.

关键词： spin-glass ergodicity-broken cavity method

Special relativity and theory of gravity via maximum symmetry and localization

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Science china Mathematics 2008年第4期51卷 568-603页

作者： GUO HanYing institute of theoretical physics chinese academy of sciences beijing 100080 china 1. institute of theoretical physics Chinese Academy of Sciences Beijing 100080 China

Like Euclid, Riemann and Lobachevski geometries are on an almost equal footing, based on the principle of relativity of maximum symmetry proposed by Professor Lu Qikeng and the postulate on invariant universal constants c and R, the de Sitter/anti-de Sitter (dS/AdS) special relativity on dS/AdS-space with radius R can be set up on an almost equal footing with Einstein’s special relativity on the Minkowski-space in the case of R→∞.Thus the dS-space is coin-like: a law of inertia in Beltrami atlas with Beltrami time simultaneity for the principle of relativity on one side, and the proper-time simultaneity and a Robertson-Walker-like dS-space with entropy and an accelerated expanding S 3 fitting the cosmological principle on another side.If our universe is asymptotic to the Robertson-Walker-like dS-space of R ? (3/Λ)1/2, it should be slightly closed in O(Λ) with entropy bound S ? 3πc 3 k B /ΛG?. Contrarily, via its asymptotic behavior, it can fix on Beltrami inertial frames without ‘an argument in a circle’ and acts as the origin of inertia.There is a triality of conformal extensions of three kinds of special relativity and their null physics on the projective boundary of a 5-d AdS-space, a null cone modulo projective equivalence [ $ \mathcal{N} $ ] ? ? P (AdS 5). Thus there should be a dS-space on the boundary of S 5 × AdS 5 as a vacuum of supergravity.In the light of Einstein’s ‘Galilean regions’, gravity should be based on the localized principle of relativity of full maximum symmetry with a gauge-like dynamics. Thus, this may lead to the theory of gravity of corresponding local symmetry. A simple model of dS-gravity characterized by a dimensionless constant g ?(ΛG?/3c 3)1/2 ～ 10?61 shows the features on umbilical manifolds of local dS-invariance. Some gravitational effects out of general relativity may play a role as dark matter.The dark universe and its asymptotic behavior may already indicate that the dS special relativity and dS-gravity be the foundati

关键词： special relativity de Sitter invariance gravity local de Sitter invariance umbilical manifold 83A05 83D05 53A35 53B50

From quantum spectra to classical orbits: Varying rectangular billiards

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Progress in Natural Science:Materials International 2008年第8期18卷 927-930页

作者： Jun Lu * Department of Foundational Science, beijing Union University, beijing 100101, china institute of theoretical physics, chinese academy of sciences, beijing 100080, china Department of Foundational Science Beijing Union University Beijing 100101 China institute of theoretical physics Chinese Academy of Sciences Beijing 100080 China

The quantum-spectrum function is introduced by means of the eigenvalues and the eigenfunctions in the system of varying rectangular billiards. It is found that the Fourier transform of the quantum-spectrum function corresponds with the classical orbits in the system. These results give new evidence about the classical-quantum correspondence.

关键词： Quantum spectrum Classical-quantum correspondence Semiclassical physics