1987年, 第8卷, 第1期　
刊出日期：1987-07-30

  

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  HOW THE ARNOLD TONGUES BECOME SAUSAGES IN A PIECEWISE LINEAR CIRCLE MAP

  杨维明, 郝柏林

  理论物理通讯. 1987, 8(1): 1-15.

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  The width of mode-locking tongues shrinks to zero at well-defined points in a piecewise linear circle map. The dimension of the set of quasiperiodic points along its critical line appears to be zero as compared to the "universal" value D=0.87. Many properties of this map can be described analytically by rational fractions.
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  MELTING OF 2D MONATOMIC SOLIDS-HARD DISK AND SQUARE WELL SYSTEM

  郭志椿, 易佑民

  理论物理通讯. 1987, 8(1): 17-27.

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  Using the Collins model of Liquids the melting of 2D monatomic solids is studied and the melting equation is derived. For the hard disk system our results agree with the computer simulation experiments quite well.For the square well system by means of the LHW theory the triple point and the melting line near the triple point is obtained to establish the phase boundary.
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  EXPONENTIAL DECAYING STATES IN MANY-BODY PROBLEM

  胡岗, A. Grecos

  理论物理通讯. 1987, 8(1): 29-41.

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  For a Hamil.tonian system with many kinds of particles interacting to a continuous field, pairs of creation and annihilation operators are constructed to describe the. exponential decaying states,applying the complex scaling theory.
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  THE OVERLAP OF MAGNETIZATION AND THE COUPLING OF IMPURITIES WI丁H LATTICE FOR DM SPIN GLASS

  姚凯伦, 刘祖黎, 朱邦杰, 史君琪

  理论物理通讯. 1987, 8(1): 43-49.

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  The overlap of magnetization of the giound state in a RKKY spin glass system with the Dzyaloshinsky-Moriya interaction is studied based on the theory of infinite number of order parameter. It is shown that the nonmagnetic impurities are coupled with the host lattice.The results are in good agreement with experiments.
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  NEW EXPRESSIONS FOR THE COLLECTIVE EXCITATION SPECTRA IN EVEN-EVEN NUCLEI

  吴崇试, 曾谨言

  理论物理通讯. 1987, 8(1): 51-74.

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  The collective spectra of the well-deformed nuclei with small axial asymmetry and the nuclei with large axial asymmetry are investigated separately in the frame of the Bohr Namiltonian. The collective spectra of well-deformed nuclei manifest the vibrational-rotational band structure and each of these bands can be expressed as a 2-parameter closed expression.The agreement between the calculated results and the observed data is very good.From this expression the radius of convergence for the energy expansion in terms of I(I+1) can be estimated and the em- pirical fact that the expansion in powers of rotational frequency converges much more rapidly than that in powers of I(I+1)can be understood. Similarly, the ground state quasi-band of the nuclei with large axial asymmetry can be expressed as a 3-parameter closed expression.
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  GENERAL SOLUTIONS OF WESS-ZUMINO CONSISTENCY CONDITIONS FOR AXIAL-VECTOR CURRENT DIVERGENCE ANOMALY

  熊传胜, 朱重远

  理论物理通讯. 1987, 8(1): 75-84.

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  The general solutions of the Wess-Zumino Consistency conditions for axial-vector current divergence anomaly are derived.The terms different from the Bardeen's anomaly in the solutions can be eliminated by using suitable counter terms which do not violate the vectox-current conservation. Thus,the Wess-Zumino conditions can be considered to be necessary and sufficient for determining the structure of the minimal consistency axial anomaly up to a multiplicative constant factor.
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  LATTICE CALCULATION OF DECAY CONSTANTS f_π AND f_ρ⁺

  郭硕鸿, 陈启洲

  理论物理通讯. 1987, 8(1): 85-89.

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  We calculate the meson decay constants f_π and f_ρ by lattice QCD in the strong coupling approximation. The ratio f_πm_ρ/f_ρ agrees reasonably well with experiment.The canonical transformation which forces the pion mass to conform with current algebra result is also essential for giving the correct value of f_πm_ρ/f_ρ.
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  THE DECAY ρ→ππ IN LATTICE GAUGE THEORY

  郭硕鸿, 陈启洲, 刘金明

  理论物理通讯. 1987, 8(1): 91-96.

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  The hadronic decays are studied by using an improved Hamiltonian including 2-link interactions. We find that the formulation is effective for studying hadronic decays as well as mass spectrum. In the intermediate coupling region,the decay width of ρ meson is found to be of the right order of magnitude.
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  A NEW PROCEDURE GENERATING THE SOLUTIONS OF STATIONARY AXIALLY SYMMETRIC GRAVITATIONAL FIELD EQUATIONS

  徐效海

  理论物理通讯. 1987, 8(1): 97-106.

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  A new procedure used to generate a set of solutions of stationary axially symmetric gravitational field equations is presented. It is shown that the Chandrasekhar metric is the most simple member of our solutions for n=1.Making use of this procedure we obtained a new exact solution of static axially sym-metric Einstein-Maxwell equations.It represents the exterior field of an isolated mass m with electrical dipolemoment.
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  U(15/30)SYMMETRY IN THE DEFORMED NUCLEUS REGION

  于祖荣

  理论物理通讯. 1987, 8(1): 107-111.

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  In the deformed nucleus region, Warner has pointed out that the single particle structure of SU(3) bands in the U(6/12) schemes is analogous to Nilsson Model. However, the Nilsson description in W region discussed by Warner also allows the odd-nucleon to move in the Oh_9/2 and 1f orbits For this reason, we introduce g-bosons and change U(6/12) to U(15/30).Our results show that the introduction of g-boson is necessary.
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  THE SCREENING BEHAVIOR IN DIFFUSION-LIMITED AGGREGATION

  翁甲强

  理论物理通讯. 1987, 8(1): 113-117.

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  The measure of the screening behavior of the diffusion-Limited aggregation in 100 clusteis by computer simulations shows that the screening length is not inversely proportional to the number density of particles [97] or to the square root of the number density of particles[10] quantitatively.
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  THE BUTATRIENE-TO-ACETYLENE TRANSITION IN POLYDIACETYLENE DUE TO THERMAL AND QUANTUM FLUCTUATION

  彭景翠

  理论物理通讯. 1987, 8(1): 119-126.

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  The butatriene-to-acetylene transition in polydiacetylene(PD) due to thermal and quantum fluctuation is investigated by using a simple continuum model.We started from general principle of statistical mechanics to discuss the rate of thermal and quantum nucleation. It is concluded that the structure-phase-transition is due to thermal fluctuation at higher, and quantum fluctuation at lower temperature mainly.It agrees with the experimental results.