1983年, 第2卷, 第6期　
刊出日期：1983-11-30

  

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  THE ALGEBRAIC STRUCTURE ON ME PROELEM OF NON-LINEAR BROWNIAN MOTION

  方福康, 姜璐

  理论物理通讯. 1983, 2(6): 1481-1488.

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  The algebraic structure for the diffusing type equation is discussed. By using the symmetry operator of the equation, the exponent operator of the equation can be decomposed. The results give the behaviour of transient process and can be compared with Suzuki's theory.
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  ELECTRIC FIELD EFFECTS ON THE ELASTIC CONSTANTS OF NENATICS II

  谢毓章, 欧阳钟灿

  理论物理通讯. 1983, 2(6): 1489-1496.

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  The threshold potentials for different types of electric Freedericksz transitions are calculated from the free energy density expression for nematics in an external electric field derived by the present authors. It is found that the experimentally determined elastic constants should be replaced by the effective elastic constants. With the effective elastic constants some of the discrepancies between earlier theoretical calculations and experimental data can be expl ained qualitatively.
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  COHERENT π⁰ PHOTOPRODUCTION IN THE QUASI-Δ₃₃ DOORWAY STATE MODEL

  马维兴, 王英才, 余自强, 徐承先

  理论物理通讯. 1983, 2(6): 1497-1504.

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  The quasi-Δ, doorway state model, previously developed to describe pion-nucleus scattering, ^[1] is applied to the study of cohe-rent π photoproduction on nuclei.The unifying features of this approach for pion elastic scattering and photoproduction are briefly discussed. The relationship to W. Weise's isobar-hole model calculation and plane wave impulse approximation calculations are examined. The results are presented for ¹⁶O(γ, π⁰)¹⁶O and ¹²C(γ, π⁰)¹²C, and compared with the available experimental data. It has a large suppression of cross section from the impulse approximation prediction.
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  STUDY OF TRANSPORT CHARACTERISTICS OF INTENSE ION BEAMS IN ACCELERATION-DECELERATION SYSTEM

  方锦清, 华大平

  理论物理通讯. 1983, 2(6): 1505-1520.

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  In this paper the numerical simulation method of using a computer for calculating transport characteristics of intense heavy ion beams with very low energy in an acceleration-deceleration system is studied systematically. Four geometrical constructions of target electrode in the acceleration-deceleration system have been calculated. The relationship between the transport characteristics of intense ion beams and physical and geometric parameters are given in detail.Our results show that the ion optics of four electrode system can maintain good beam focal quality for intensetion beams.
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  THE KINETIC EFFECTS OF THE RUNAWAY ELECTRONS DURING THE DISCHARGE PROCESS IN THE TOROIDAL SYSTEM

  郭书印

  理论物理通讯. 1983, 2(6): 1521-1531.

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  In this paper, the kinetic effects of the runaway electrons during the discharge process in the toroidal system are investigated, taking into account the effects of the, curvature and the gradient of the magnetic field. The density and the temperature of the electrons are inhomogeneous and some criterions of the.instabilities are obtained.
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  GAUGE CONDITIONS AND THE RENORMALIZABILITY OF A GENERALIZED GAUGE TIiEORY CONSISTING OF SEVERAL ABELIAN AND NON-ABELIAN SUB-GROUPS

  李文铸, 汪容, 诸绍林

  理论物理通讯. 1983, 2(6): 1533-1551.

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  We discuss generalized gauge conditions and the renormalizability of a generalized gauge theory, which contains finite numbers of Abe-Zian and non-Abelian sub-groups. The isomorphism between gauge groups before and after renormalization is demonstrated.
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  THE DECOPOSITION OF THE GAUGE POTENTIAL AND LTS aUANTIZATION THEORY

  段一士, 赵书城

  理论物理通讯. 1983, 2(6): 1553-1562.

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  In this presentation, the quantization and renormalization of the Yang-Mills field theory are discussed from the stagdpoint of the decomposition of gauge potential.It may be regard as a new basis for the formulation of the fundamental interactions of particle theories.
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  COHERENT STATE FORMULATION OF THE WEYL CORRESPONDENCE AND THE WIGNER FUNCTION

  范洪义, 阮图南

  理论物理通讯. 1983, 2(6): 1563-1574.

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  We point out that there is a close connection between the Weyl correspondence and coherent state correspondence. Bu virtue of differential and integral method within normal ordered products we demonstrate that the essence of the Gleyl correspondence is just coherent state correspondence in both boson and fermion cases. Furthermore, coherent state form and explicit operator form for the Wigner function are given. With these forms we can derive some important operator formulas from the Wey1 correspondence. The Wigner function's zero-point value is also discussed.
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  PNASE TRANSITION APID CROSSOVER IN LATTICE GAUGE THEORIES

  郭硕鸿, 陈启洲, 刘金明

  理论物理通讯. 1983, 2(6): 1575-1582.

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  We propose a modified mean field theory for pure Lattice gauge systems. The theory emphasizes independent playuette contributions rather than independent link contributions as in the usual mean field theory. Using only one lihk integrals, the theory reproduces the overall behavior of mean plaquette energies for various gauge groups over a wide range of β including the phase transition or crossover region. The theory discriminates between actual phase transition and crossover behavior for different gauge groups.
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  FACTORIZATION OF SU_C(3) AT HYPERCOLOR SCALE ∧_H AND INDUCED GOLDSTONE BOSONS IN COMPOSITE MODELS

  张肇西, 周邦融

  理论物理通讯. 1983, 2(6): 1583-1589.

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  The two possibilities (corresponding to various spontaneous breaking patterns for hyperflavor) for the color group SU_C(3) factorized at the hypercolor scale ∧_H for a kind of composite models are discussed, in which the color inferaction is asymptotically non-free on the preon level, and it is pointed out that the two patterns could be distinguished experimentally by the great difference in number of the induced pseudogoldstones.
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  ON THREE THEOREMS OF LIE SUPERGROUPS AND LIE SUPERALGEBRAS

  朱重远

  理论物理通讯. 1983, 2(6): 1591-1599.

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  An approach to three theorems of the relation between Lie supergroups and Lie superalgebras without much advanced mathematical preliminaries is given.
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  THE DIPOLE POMERON AND K⁺P ELASTIC SCATTFRING UP TO 310 GeV/c

  Mujahid Kamran

  理论物理通讯. 1983, 2(6): 1601-1605.

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  Using a dipole pomeron ansatz a good fit to the K⁺P total and near-forward elastic differential cross-sections and Re/Im data in the 35≤p2ab≤310 Gev/c region is obtained for |t|≤1(Gev/c)².
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  SPECIAL FEATURES OF 1-DIMENSIONAL DILUTE MAGNETIC ALLOYS

  刘福绥, 包科达, 杨振凡

  理论物理通讯. 1983, 2(6): 1607-1611.

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  The susceptibility, range function and RKKY interaction of 1-di-mensional dilute magnetic alloys are given. The special features are: there is only ferromagnetic phase transition for small values of 2K_F(R_j-R_i); 1-dimensional range function and RKKY interaction are alonger distance interaction than the 3-dimensional case. Comparisons between our theory and others' are made.
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  EIGENFUNCTION METHOD FOR SPACE GROUP CLEBSCH-GORDAN COEFFICIENTS

  陈金全, 高美娟, 马光群

  理论物理通讯. 1983, 2(6): 1613-1618.

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  An easily programmable algorithm is established for obtaining the reduction coefficients and Clebsch-Gordan coef-ficients of a space group simultaneously based on the eigen-function method.