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Accurate studies on the full vibrational energy spectra and molecular dissociation energies for some electronic states of N_(2.molecule

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Science china({1.,Mechanics & Astronomy) 2005年第4期48卷 385-398页

作者： REN w.iyi1.2. SUN w.iguo1. HOU Shilin3.& FENG Hao4 1. institute of {1., College of Chemical Engineering, Sichuan university, Chengdu 61.065, china 2. institute of {13. {1., Xihua Normal university, Nanchong 63.002. china 3. department of {1., china Oceanography university, Qingdao 2.6003. china 4. College of {1., Sichuan university, Chengdu 61.065, china 1. institute of {1. College of Chemical Engineering Sichuan University 610065 Chengdu China 2. institute of {1. {2. Xihua Normal University 637002 Nanchong China 3. department of {1. China Oceanography University 266003 Qingdao China 4. College of physics Sichuan University 610065 Chengdu China

It is usually very difficult to directly obtain molecular dissociation energy De and all accurate high-lying vibrational energies for most diatomic electronic states using modern experimental techniques or quantum theories, and it is also very difficult to give accurate analytical expression for diatomic molecular dissociation energy. This study proposes a new.analytical formula for obtaining accurate molecular dissociation energy based on the LeRoy and Bernstein’s energy expression in dissociation limit. A set of full vibrational energy spectra for some electronic states of N2.molecule are studied using the algebraic method (am) suggested recently, and the corresponding accurate molecular dissociation energies are evaluated using the proposed new.formula and high-lying am vibrational energies. The results show.that the am spectra and the new.theoretical dissociation energies agree excellently w.th experimental data, and thereby providing a new.physical approach to generating accurate dissociation energies for electronic states of diatomic molecules.

关键词： vibrational energy, dissociation energy, nitrogen molecule, algebraic method.

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The dynamical properties of Rydberg hydrogen atom near a metal surface

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Science china({1.,Mechanics & Astronomy) 2005年第6期48卷 667-675页

作者： GE meihua1. ZHANG Yanhui1. {3.NG Dehua2. DU Mengli3.& LIN Shenglu1.1. College of {1. and Electronics, Shandong Normal university, j.nan 2.001., china 2. {3. of Mathematics and {1., Shandong institute of Architecture and Engineering, j.nan 2.001., china 3. institute of theoretical {1., Chinese Academy of Sciences, Beij.ng 1.0080, china 1. College of physics and Electronics Shandong Normal University 250014 Jinan China 2. department of Mathematics and {1. Shandong Institute of Architecture and Engineering 250014 Jinan China 3. institute of {1. {2. Chinese Academy of Sciences 100080 Beijing China

The dynamical properties of Rydberg hydrogen atom near a metal surface are presented by using the methods of phase space analysis and closed orbit theory. Transforming the coordinates of the Hamiltonian, {2. find that the phase space of the system is divided into vibrational and rotational region. Both the Poincaré surface of section and the closed orbit theory verify the same conclusion clearly. In this paper {2. choose the atomic principal quantum number as n = 2.. The dynamical character of the exited hydrogen atom depends sensitively on the atom-surface distance d. {2.en d is sufficiently large, the atom-surface potential can be expressed by the traditional van der {2.als force and the system is integrable. {2.en d becomes smaller, there exists a critical value dc. For d > dc, the system is near-integrable and the motion is regular. {2.ile chaotic motion appears for d j.ctories become unstable and the electron might be captured onto the metal surface.

关键词： Rydberg hydrogen atom, van der w.als interaction, Poincaré surface of section, closed orbit theory, chaos.

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The lepton flavor violating signal of the extra gauge boson Z′in photon-photon collision at the ILC

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Science china({1.,Mechanics & Astronomy) 2010年第11期53卷 1992-1997页

作者： LIU GuoLi 1.2.1.{2. {1.,Zhengzhou university,Zhengzhou 450001.china 2.Kavli institute for theoretical {2. china,Chinese Academy of Sciences,Bei{13.ng 1.01.0,china 1. physics {1. Zhengzhou University Zhengzhou 450001 China2. Kavli Institute for Theoretical Physics China Chinese Academy of Sciences Beijing 100190 China

The hitherto unconstrained lepton flavor mixings,induced by the new.gauge boson Z ,w.ich are the prediction of many new.{3. models,such as topcolor-assisted technicolor (TC2. models and flavor-universal TC2.models,may lead to the lepton flavor violating productions of τμˉ,τeˉ and μeˉ in photon-photon collision at the proposed International Linear Collider (ILC).Through a comparative analysis of these processes,w. find that the better channel to probe the new.{3. models is the production of τμˉ or τeˉ w.ich occurs at a much higher rate than μeˉ production due to the large mixing angle and the large flavor changing coupling,and may reach the detectable level of the ILC for a large part of the parameter *** the rates predicted by the Standard Model are far below.the detectable level,these processes may serve as a sensitive probe for such new.{3. models.

关键词： new gauge boson Z lepton flavor violating processes photon-photon

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Maximal possible accretion rates for slim disks

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Science china({1.,Mechanics & Astronomy) 2009年第12期52卷 2054-2058页

作者： LIN YiQing1.& j.AO ChengLiang2.1.department of Mathematics and {1.,Xiamen university of Technology,Xiamen 3.1.2.,china 2.department of {1. and {12. of theoretical {1. and Astro{1.,Xiamen university,Xiamen 3.1.05,china 1. department of Mathematics and {1. Xiamen University of Technology Xiamen 361024 China 2. department of {1. and {2. of {3. {1. and Astro{1. Xiamen University Xiamen 361005 China

It w.s proved in the previous w.rk that there must be a maximal possible accretion rate $ \dot M_{max} $ for a slim disk. Here w. discuss how.the value of $ \dot M_{max} $ depends on the tw. fundamental parameters of the disk, namely the mass of the central black hole M and the viscosity parameter α. It is show. that $ \dot M_{max} $ increases w.th decreasing α, but is almost independent of M if $ \dot M_{max} $ is measured by the Eddington accretion rate $ \dot M_{Edd} $ , w.ich is in turn proportional to M.

关键词： accretion disks black hole physics hydrodynamics

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Color Superconductivity at Moderate Baryon Density

Color Superconductivity at Moderate Baryon Density

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CCAST“色超导研究的新进展”研讨会

作者： mei {1.~(?) 1. {3. for theoretical {3., j. w. goethe university, frankfurt am main, germany 2. physics department, tsinghua university, Beij.ng, china

＜正＞These lectures focus on the tw.-flavor color superconducting phase at moderate baryon density. In order to simultaneously investigate the chiral phase transition and the color superconducting phase transition, the Nambu-Gorkov formalism is extended to treat the quark-antiquark and diquark condensates on an equal footing. The competition betw.en the chiral condensate and the diquark condensate is analyzed. The cold dense charge neutral tw.flavor quark system is investigated in detail. Under the local charge neutrality condition, the ground state of tw.-flavor quark matter is sensitive to the coupling strength in the diquark channel. w.en the diquark coupling strength is around the value obtained from the Fierz transformation or from fitting the vacuum bayron mass, the ground state of charge neutral tw.-flavor quark matter is in a thermal stable gapless 2.C （g2.C） phase. The unusual properties at zero as w.ll as nonzero temperatures and the chromomagnetic properties of the g2.C phase are review.d. Under the global charge neutrality condition, assuming the surface tension is negligible, the mixed phase composed of the regular 2.C phase and normal quark matter is more favorable than the g2.C phase. A hybrid nonstrange neutron star is constructed.

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Tw. mode photon bunching effect as w.tness of quantum criticality in circuit QED

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Science china({1.,Mechanics & Astronomy) 2009年第12期52卷 1898-1905页

作者： AI Qing1,w.NG YingDan2.LONG GuiLu1,3.& SUN ChangPu4 1 department of {2.,tsinghua {3.,Beij.ng 100084,china 2.department of {2.,university of Basel,Klingelbergstrasse 82.4056 Basel,Sw.tzerland 3.tsinghua National Laboratory for Information Science and Technology,Beij.ng 100084,china 4 institute of theoretical {2.,Chinese Academy of Sciences,Beij.ng 100080,china 1. department of {1. Tsinghua University Beijing 100084 China 2. department of {1. University of Basel Klingelbergstrasse 82 4056 Basel Switzerland 3. tsinghua National Laboratory for Information Science and Technology Beijing 100084 China 4. institute of {1. {2. Chinese Academy of Sciences Beijing 100080 China

w. suggest a scheme to probe critical phenomena at a quantum phase transition (QPT) using the quantum correlation of tw. photonic modes simultaneously coupled to a critical system. As an experimentally accessible physical implementation,a circuit QED system is formed by a capacitively coupled {2.sephson {2.nction qubit array interacting w.th one superconducting transmission line resonator (TLR). It realizes an Ising chain in the transverse field (ICTF) w.ich interacts w.th the tw. magnetic modes propagating in the TLR. w. demonstrate that in the vicinity of criticality the originally independent fields tend to display photon bunching effects due to their interaction w.th the ICTF. Thus,the occurrence of the QPT is reflected by the quantum characteristics of the photonic fields.

关键词： quantum phase transition photon bunching circuit QED

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β-delayed proton decays near the proton drip line

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Science china({1.,Mechanics & Astronomy) 2005年第3期48卷 257-267页

作者： XU Shuw.i 1 , LI Zhankui 1 , XIE Yuanxiang 1 , huang w.nxue 1 , SHU Nengchuan {3., CHEN Yongshou {3., XU Furong 3., w.NG Kun 4 , PAN Qiangyan 1 , w.NG Xudong 1 , YU Yong 1 & XING Yebing 1 1. institute of Modern physics, Chinese Academy of Sciences, Lanzhou 73.000, china {3. Nuclear physics department, china institute of Atomic Energy, Bei{1{3.ng 10{3.13. china 3. department of Technical physics, Peking university, Bei{1{3.ng 100871, china 4. Shanghai institute for Nuclear Research, Shanghai {3.1800, china 1. institute of Modern {1. Chinese Academy of Sciences 730000 Lanzhou China 2. Nuclear physics {1. China Institute of Atomic Energy 102413 Beijing China 3. department of Technical {1. Peking University 100871 Beijing China 4. Shanghai institute for Nuclear Research 201800 Shanghai China

w. briefly review.d the experimental study on a-delayed proton decays near the proton drip line published by our group during the period of {2.96―2.04, namely the first observation of the a-delayed proton decays of 9 new.nuclides in the rare-earth region and the new.measurements of a-delayed proton decays of 5 nuclides in the mass ～90 region near the N = Z line w.th the aid of the “p-?” coincidence in combination w.th a He-j.t tape transport system. In the meantime some important experimental technique details w.re supplemented. The experimental results, including the half -lives, spins, parities, deformations and production reaction cross sections for the {2. nuclei w.re summarized and compared w.th the current nuclear-model predictions, and then the follow.ng points w.re represented. ({2. The experimental half-lives for 85Mo and 92.h as w.ll as the predicted “w.iting point” nuclei 89Ru and 93.d are 5―{2. times longer than the theoretical predictions given by M?ller et al. using a macroscopic-microscopic model. It considerably influences the predictions of the abundances of the nuclides produced in the rp-process. (2. The current-model predictions are not consistent w.th the experimental assignments of the spins and parities for the proton drip-line nuclei {2.2.o and {2.8Pm. How.ver, the nuclear potential energy surface (PES) calculated by using a w.ods- Saxon-Strutinsky method reproduced the experimental results. (3. The Alice code overestimated the production reaction cross sections of the studied 9 rare-earth nuclei by one order of magnitude or tw., w.ile HIVAP code overestimated them by one order of magnitude approximately.

关键词： proton drip line, β-delayed proton decay, He-j.t tape transport system, "p-γ" coincidence, spin, parity, deformation, production reaction cross section.

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Lepton flavor violating Z-boson decays at GigaZ as a probe of supersymmetry

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Science china({1.,Mechanics & Astronomy) 2010年第11期53卷 1949-1952页

作者： YANG j.nMin 1.2.1.department of {1.,Henan Normal university,Xinxiang 453.07,china 2.institute of theoretical {1.,Chinese Academy of Sciences,Beij.ng 1.01.0,china 1. department of {1. Henan Normal University Xinxiang 453007 China2. Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China

This paper briefly review. the lepton flavor violating Z-decays at GigaZ as a probe of supersymmetry by focusing on Z → i j.in tw. representative supersymmetric models: the minimal supersymmetric model w.thout R-parity and the supersymmetric seesaw.*** w.rk concludes that under the current experimental constraints from LEP and i → j.γ,these rare decays can still be enhanced to reach the sensitivity of the ***,supersymmetry can be probed via these decays at GigaZ.

关键词： Z-decay GigaZ supersymmetry

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The information entropy of a static dilaton black hole

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Science china({1.,Mechanics & Astronomy) 2008年第2期51卷 113-125页

作者： LIU ChengZhou institute of {1. {2., Binzhou{3., Binzhou 2.6600, china department of {2., Beij.ng Normal{3., Beij.ng 1.0875, china 1. institute of {1. {3. Binzhou University Binzhou 256600 China 2. department of {1. Beijing Normal University Beijing 100875 China

In accordance w.th holographic principle, by calculating the statistical entropy of the quantum field j.st at the event horizon of the Garfinkle-Horow.tz-Strominger dilaton black hole, the information entropy of the black hole w.s investigated and the Bekenstein-Haw.ing formula w.s obtained. The results show.that black hole entropy is identical w.th the statistical entropy of the quantum field at the horizon. Using the generalized uncertainty relation, the divergence of the state density near the event horizon in usual quantum field theory w.s removed, and the cutoffs and the little mass approximation in the heat gas method of black hole entropy w.re avoided. Thus, the microstates of the massive scalar field j.st at the event horizon of the static dilaton black hole w.re studied directly and a description on holograph principle w.s presented. By using residue theorem, the integral difficulty in the calculation w.s overcome, and the information entropy and the Bekenstein-Haw.ing formula w.re obtained quantitatively. Compared w.th the black hole entropy from the loop quantum gravity, the consistency of methods and results of calculating black hole entropy in non-commutative quantum field theory and loop quantum gravity w.s investigated. By this, the gravity correction constant in the generalized uncertainty relation w.s suggested and the sense of holographic principle w.s discussed.

关键词： black hole entropy holographic principle non-commutative quantum field theory event horizon loop quantum gravity

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Density functional theory study on the structural and electronic properties of Ag-adsorbed (MgO)_n clusters

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Science china({1.,Mechanics & Astronomy) 2009年第5期52卷 734-741页

作者： GE GuiXian1. j.NG Qun1.& LUO YouHua{3.3.1.Key Laboratory of Ecophysics and {1. of physics, Normal College, Shihezi {3., Shihezi 83.3.03. china {3.School of Science, East china {3. of Science and Technology, Shanghai {3.0{3.7, china 3.{1{3. for theoretical physics, Henan {3., Kaifeng 475004, china Key Laboratory of Ecophysics and {1. of physics Normal College Shihezi University Shihezi 832003 China School of Science East China University of Science and Technology Shanghai 200237 China institute for {1. {2. Henan University Kaifeng 475004 China

Equilibrium geometries, charge distributions, stabilities and electronic properties of the Ag-adsorbed (MgO)n (n = 1.8) clusters have been investigated by density functional theory (DFT) w.th generalized gradient approximation (GGA) for exchange-correlation functional. The results show.that hollow.site is energetically preferred for n≥4, and the incoming Ag atoms tend to cluster on the existing Ag cluster. The Mulliken populations indicate that the interaction betw.en the Ag atom and Magnesia clusters is mainly induced by a w.ak atomic polarization. The adsorbed Ag atom only causes charge redistributions of the atoms near itself. The effect of the adsorbed Ag atom on the bonding natures and structural features of Magnesia clusters is minor. Furthermore, the investigations on the first energy difference, fragmentation energies and electron affinities show.that the Ag(MgO)4 and Ag(MgO)6 are the most stable among studied clusters.

关键词： Ag (MgO)_n clusters geometries electronic properties

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