1988年, 第9卷, 第3期　
刊出日期：1988-04-30

  

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  THE PHONON DENSITY OF STATES AND THE NEUTRON SCATTERING FACTOR FOR A DISORDERED POLYMER CHAIN

  褚小麟, 姚凯伦

  理论物理通讯. 1988, 9(3): 253-261.

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  In this paper we calculated the phonon density of states and the neutron scattering factor in a model of a random polymer chain embedded as a self-avoiding walk on a diamond lattice by using the equation of motion method of Green's function. The Iiadltonian of the mdel includes stretching force, bending force and dihedral force. The result showea that the gap near ω=0 disappeared,which is in good agreement with experiment. It is also found that peaks of the spectrunr at low frequencies are sensitive to the degree of crystallization. This indicates that they are related only to the vibration of the crystalline region.
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  A COARSE GRAINING FOR THE ISING MODEL ON TWO-DIMENSIONAL DISORDERED LATTICE

  刘中柱

  理论物理通讯. 1988, 9(3): 263-270.

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  A coarse graining for the Ising model on two-dimensional topoloqical disordered lattice is proposed. It is show that for a fixed point of coarse qrainink on topological disordered lattice there exists a corresponding fixed point of twelve-sided lattice.
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  BEHAVIOR OF THE ISING MODEL FOR 2-D TOPOLOGICAL DISORDERED LATTICE NEAR THE FIXED POINTS

  刘中柱

  理论物理通讯. 1988, 9(3): 271-278.

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  By means of coarse Braining of Ising model on 2-D triangular lattice a scheme for coarse graining of Ising model on 2-D topological disordered lattice is presented. For a topological disordered lattice with periodic boundary condition, the behavior of using model for topological disordered lattice is identical to that for triangular lattice in the vicinity of the respective fixed points.
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  REFLECTION OF ELECTROMAGNETIC WAVES FROM METALLIC MULTILAYERS

  薛登平, 蔡建华

  理论物理通讯. 1988, 9(3): 279-290.

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  The reflection of electromagnetic waves on metallic multilayers is studied in terms of a hydrodynamical model .It is shown that for TE waves, selective reflections occur at frequencies ω>ω_pl in the case of vertical incidence and at higher frequencies in cases of oblique incidence, while for TM waves,they are totally reflected at all frequencies higher than ω_pl. These properties may render metallic multilayers useful in optical devices.
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  EXPANSION OF RADIAL WAVE FUNCTION OF d OR f ELECTRONS AND THE SHIFTS OF CRYSTAL FIELD SPECTRA⁺ I.GENERAL THEORY

  马东平, 郑希特, 徐益荪, 章正刚

  理论物理通讯. 1988, 9(3): 291-297.

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  The physical essentials of the shifts of crystal field spectra with the change of impurityion-ligand distance may be understood. by an expansion of radial electron wave functions. Under the assumptions that the compression is isotropic and the symmetry of the crystal and the characteristics of the spectra are unchanged, only the radial part of the electron wave function undergoes a continuous expansion. The variations of energies with pressure for three fundamental interactions are expressed by the expansion function φ(k).By using these expressions the spectral shifts can be given by φ(k). The results and applications of the theory are discussed.
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  EXPANSION OF RADIAL WAVE FUNCTION OF d OR f ELECTRONS AND THE SHIFTS OF CRYSTAL FIELD SPECTRA⁺ Ⅱ. RUBY FLUORESCENCE R₁ LINE

  马东平, 郑希特, 章正刚, 徐益荪

  理论物理通讯. 1988, 9(3): 298-306.

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  By analysing the characters of R1 transition energy, starting from a general theory, the relation between red shift Δλ/λ₀ and expansion function φ(K) is derived. The explicit expressionsof φ(K) and available over a wide range of pressure are obtained. The pressurey vs. compression ratio relation P-K is calculated by using Birch equation. The red shifts are calculated upto 1.7mbar.The agreement with experimental data is satisfactory. Finally, the results are dis-cussed.
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  A POSSIBLE MODEL OF HEAVY FFRMION SUPERCONDUCTIVITY

  章立源

  理论物理通讯. 1988, 9(3): 307-312.

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  We used the periodic Anderson Hamiltonian to study the behaviour of heavy fermion systems. It has been argued that=the properly large mixing between f and the conduction electrons, and the related renormalization effect are the main causes of the large effective mass of the quasi-particle. Further, we introduced phenomenoloigcally the BCS attractive interaction between the heavy quasi-particles and explained that the valueof ΔC/γT_c and T_c may be quite different from that of the BCS theory as a result of the interaction between two branches of the quasi-particles.
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  STUDY ON GAMMA EMISSION P9ECHANISM IN EXCITON MODEL—A UNIFIED COMPOUND PRE-EQUILIBRIUM MODEL(1)

  张竞上, 温源琪, 施向军, 王书暖

  理论物理通讯. 1988, 9(3): 313-323.

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  To study the descriptions of nuclear preequilibrium and equilibrium processes, a unified compound and pre-equilibrium model including not only particles but also γ-ray emissions is developed. The γ-ray emission mechanism is studied first.The calculated γ-ray emission cross-section and spectrum of fast neutron bombarding ²⁰⁸Pb,¹⁸⁴W are in good agreementwith experimental data.
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  ON THE DYNAMIC EFFECT IN PHASE TRANSITIONS OF FINITE SYSTEMS—ILLUSTRATED WITH A TWO-LEVEL SP(4)MODEL

  李福利, 徐躬耦

  理论物理通讯. 1988, 9(3): 324-339.

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  The phase transition of the two-level SP(4) model was investigated. By comparing the exact results with the approximate results of the static mean field theory, the importance of the dynamic effect in phase transitions of finite systems is exhibited.
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  PHASE OPERRTORS FOR ATOMIC SYSTEM IN SCHWINGER BOSON REPRESENTATION AND THEIR PROPERTIES

  范洪义, 李永平

  理论物理通讯. 1988, 9(3): 340-351.

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  In terms of the Schwinger boson representation of angular momentum We introduce suitable phase operators which exhibit similar properties to those of the phase operators in radiation field into atomic system. With the help of them angular momentum's third component phase uncertainty relation are discussed. Also, the eigenstates of the Hermitian phase operator are derived.
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  A REALISTIC TECHNICdLOR GUT MODEL

  东方晓

  理论物理通讯. 1988, 9(3): 352-358.

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  We discussed a realistic model of a grand unified theory including the known forces and technicolor. This is the modification for the toy model of Farhi and Susskind (FS). All of the the main difficultie of the FS model are overcome, while the good features of the FS model are preserved.
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  SELF-CONSISTENT TREATMENT OF PLASMA EXPANSION IN THE PRESENCE OF ELECTRON PLASMA WAVE

  余玮, 徐至展

  理论物理通讯. 1988, 9(3): 359-364.

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  The hydrodynamic modification of an expanding plasma near the reflection point of an electron plasma wave is investigated by simultaneously solving the wave equation together with the steady-state hydrodynamic equations.The electric field and electron density fluctuation of the plasma wave are derived in a self-consistently steepened density profile. while the density jump and its dependence on the wave amplitude are also determined.
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  KINETIC ANALYSIS ON LHWRH IN TOKAMAK

  郭书印

  理论物理通讯. 1988, 9(3): 365-373.

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  In this paper, we analysed and computed LHWRH in tokamak from kinetics. Two reasons, i.e., electromagnetic effect and the effect of unequal temperature for electrons and ions, crere proposed for explaining the experimental result that the bulk ion heating near the mode conversion layer seems to be less reproducible. Finally, we obtained the LHW accessibility and the maximum energy deposition region in the N²-N² space.