1984年, 第3卷, 第1期　
刊出日期：1984-01-30

  

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  THE SUPERCONDUCTING TUNNELLING CURRENT UNDER MICROWAVE IRRADIATION

  吴萱如, 刘长富, 龚昌德

  理论物理通讯. 1984, 3(1): 1-13.

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  In this article, the non-eguilibrium Green's function method developed by Keldysh^[1]and Larkin-Ovchinnikov^[2]is used to derive the expressions for quasi-particle and Josephson current of a superconducting junction under microwave irradiation. As an example, the results up to second order of irradiation field have been calculated. The influences of the microwave have been discussed briefly.
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  P-IC-C SUCCESSIVE TRANSITIOKS IN FERROELECTRICS-I,TYPE-I IC SYSTEM

  杨振青, 郭儒

  理论物理通讯. 1984, 3(1): 15-23.

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  In this paper, we derive a general multi-harmonic modulation solution for the general model of Type-I IC systems, based on the point of view of an earlier paper of the authors. In two limit cases it reduces to single-harmonic modulation and kink solution respectively. The basic wave-vector of modulation decreases monotonically with temperature, which is in agreement with what were observed in experiments. The conditions and characteristics of the P-IC and IC-C transitions are also discussed.
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  P-IC-C SUCCESSIVE TRANSITIONS IN FERROELECTRICS-II,TYPE-II IC SYSTEM

  杨振青, 郭儒

  理论物理通讯. 1984, 3(1): 25-30.

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  In this paper we deal with type-II IC ferroelectric systems with a unified point of view of paper I. We obtain a general modulation solution which in the whole IC-Phase may reduce to single-harmonic modulation approximately and doesn't reduce to a kink solution. This is the main feature that is different from that of type-I systems. The basic wave-vector of modulation decreases monotonically with temperature as that of type-I system does.
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  THE QUARK CLUSTER MODEL OF NUCLEAR FORCE:(Ⅰ) EXPONENTIAL QUARK CONFINEMENT POTENTIAL AND NON-STRANGE BARYONIC SPECTRUM

  郑玉明

  理论物理通讯. 1984, 3(1): 31-38.

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  In this paper it is assumed that the quark-quark two-particle interaction is the Coulomb-like plus exponentially rising confinement potential.The non-strange baryonic spectrum below 2 GeV has been studied consistently by the potential.The calculated position of the resonanees and the predicted mixing angles are in good agreement with experiments. It is shown that the potential can describe successfully the properties of all the low-lying non-strange baryon states.The contribution of the spin-orbit coupling force to the spectrum has also been discussed.
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  THE EXCITATION OF 9.5 MeV LEVEL OF ¹³C IN QUASI-Δ₃₃ DOORWAY STATE MODEL

  马维兴, 张宗烨, 余自强, 徐承先

  理论物理通讯. 1984, 3(1): 39-44.

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  We have studied the excitation mechanism of 9.5 MeV Level of ¹³C in ¹³C(π^±,π^1±)¹³C (9.5 MeV) inelastic scattering in the framework of Quasi-X33 Doorway State. Model .Assuming. the transition to 9.5 MeV state is of a pure neutron has received satisfactory agreement with experiment. The results strongly suggest that the spin and parity assignment of state,9.5 MeV of ¹³C should be Jπ=9/2⁺.
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  QUANTUM THEORY FOR FERMION SYSTEM AND ITS PSEUDO-CLASSICAL CORRESPONDENCE

  范洪义, 阮图南

  理论物理通讯. 1984, 3(1): 45-58.

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  On the basis of the fermionic coherent state formulation we propose the weyl-McCoy correspondence for fermion system, from which a functional integral form without the boundary term is derived. Moreover, the generating functional, the wigner theorem. and the Moyal bracket for fermion system are also demonstrated. Thus the theory of quantum mechanics for Fermi operators and its pseudo-classical correspondence is established.
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  EVALUATION OF EFFECTIVE POTENTIAL FOR GROSS-NEVEU MCDEL WITH TADPOLE DIAGRAM METHOD

  汪荣泰, 倪光炯

  理论物理通讯. 1984, 3(1): 59-71.

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  The effective potential of Gross-Neveu model with o(1/N) corrections is calculated by using tadpole diagrams and dimensional regularization technique. After the high order of the effective potential is taken into account the continuous symmetry will not be violated while the discrete chiral symmetry still remains broken. This provides an interesting example of Coleman's theorem in two-dimensional field theory. The calculation results are in agreement with those of R.G. Root who had summed up a sort of infinite diagrams. Our conclusion is also consistent with that of the variational method based on BCS wave functions.
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  ON WITTEN'S EFFECTIVE LAGRANGIAN FOR CHIRAL FIELD

  周光召, 郭汉英, 吴可, 宋行长

  理论物理通讯. 1984, 3(1): 73-80.

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  Wess and Zumino's effective Lagrangian for the chiral field is derived by a new method which shows the direct relationship between the Lagrangian and the difference of the left handed and right handed Chern-Simons topological invariants. The resulting Lagrangian is explicitly left and right antisymmetric and equal to the one obtainedin a previous letter by a different method.
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  BROKEPI DCD AND UNCONFINING QQ POTENTIAL

  赵光达

  理论物理通讯. 1984, 3(1): 81-93.

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  The static potential for a heavy quark pair QQ system is studied in the framework of the MIT bag model under the Born-Oppenheimer approximation. It is found that if the color gauge symmetry is spontaneously broken and a gluonic mass term emerges in the Lagrangian the QQ potential, would tend to a constant as the separation of the quarks tends to infinity and the slope of the potential at small separations would decrease as the gluon mass increases. The relation between the unconfining QQ potential and the unconfined free quarks is also discussed.
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  THE PHASE STRUCTURE OF 4-d U(1) HIGGS MODEL WITH RADIAL EXCITATION

  宋永燊, 张大鸿

  理论物理通讯. 1984, 3(1): 95-102.

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  On 4⁴ regular lattice, the phase structure of U(1) Higgs model-a U(1) lattice gauge theory coupled to a scalar (Higgs) field-has been studied by using modified Metropolis algorithm without freezing the radial excitation of the Higgs field carrying fundamental charge. The result shows that Higgs and confined regions are completelg separated by a first-order phase transition line and the phase diagram of our model.consists of three distinct phases. This feature greatly differs from that of the model with radially frozen Higgs field discussed by D.J.E.Callaway and L.J. Carson.^[1]
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  HYPERSPHERICAL FUNCTION AND SP(2,R)GROUP

  于祖荣

  理论物理通讯. 1984, 3(1): 103-111.

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  In the present paper a method for constructing the hyperspherical function for the internal motion of many-body system in the scheme Sp(2m,R)⊃Sp(2,R)×O(m) based on the complementarity of the symplectic Sp(2,R) and the orthogonal O(m) groups is developed. A generate formula for the fractional-parentage coefficients of the hyperspherical function is obtained and it is shown that the formula can be used to to calculate the spectroscopic factor for the arbitrarym-cluster,etc..
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  STUDY OF THE REACTION π^－P→K°(890)Λ

  Muhammad Rafique, Mohammad Saleem

  理论物理通讯. 1984, 3(1): 113-118.

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  The dual absorptive model has been used to fit the recently measured experimental data on the differential cross-section, density matrix elements and polarization in the reaction π^－p→k°(890)Λ.
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  PROTON-AMTIPROTOM ELASTIC SCATTERING AT HIGH ENERGIES

  Fazal-e-Aleem, Saifuddin

  理论物理通讯. 1984, 3(1): 119-123.

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  The differential cross sections for high energy P P elastic scattering showing structure near -t=1.5 (GeV/c)² for P_L=50,100 and 200 GeV/c together with total cross sections for 50≤P_L≤280 GeV/c, and with -t extending up to 5(GeV/c)² have been fitted by using a dipole pomeron model.
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  THE TOPOLOSICAL ORIGINS OF GAUGE ANOMALIES

  周光召, 郭汉英, 吴可, 宋行长

  理论物理通讯. 1984, 3(1): 125-129.

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  In addition to the recent discovery that the Chern-Simons secondary classes are the topological origins generating special unitary gauge group anomalies, it is shown that some special orthogonal gauge group anomalies can also be generated, from the Pontrjagin and the Euler secondary classes. The common differential geometrical and topological background are explained as well.
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  THE U(3) ANOMALY

  吴可

  理论物理通讯. 1984, 3(1): 131-138.

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  The U(3) anomaly will be given based upon the geometrical and topological method which was used in deterurinating the anomalies for SU(N) and SO(N) gauge fields. It is shown that both the non-Abelian and the Abelian anomaly can be derived in unified treatment from the third Chern class and corresponding Chern-Simons secondary class of the U(3) group.