1982年, 第1卷, 第5期　
刊出日期：1982-09-30

  

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  PHONON ANALYSIS IN MULTIPHONON TRANSITIONS

  黄昆, 顾宗权

  理论物理通讯. 1982, 1(5): 535-555.

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  In the investigation of multiphonon transitions, single-mode or single-frequency models are widely used. In view of the fact that such oversimplified models. can be seriously inadequate, the present work bridges the gap between the complexity of the general formal theory and the simplicity required for concrete applica-tions by introducing the concept of mufti-frequency models. That is, the theory is so formulated that a general system can be ap-proximated by mufti-frequency models of any degree of elaboration.
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  NEW TRANSFORMATION FOR TREATING PAIR CORRELATION AND MICROSCOPIC FOUNDATION OF INTERACTING BOSON MODEL

  杨立铭

  理论物理通讯. 1982, 1(5): 557-568.

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  For strongly pair-correlated systems, a new transforniation is derivqd similar in form to the usual Bogoliubov-Valatin transformation, but with the transformation coefficients replaced by operators. The original fermion operators C_α⁺, C_α are now replaced by two sets of independent operators, the pair operators S_α⁺, S_α and the quasi-fermions a_α⁺, a_α The transformation conserves the particle number. Among other applications, it is particularly suited for the construction of a microscopic theory of the type of the interacting boson model. The new transformation given here also serves to provide a connection between the usual ph picture of a phonon and the pp picturevof bosons in IBM. However, the boson picture that evolves from the present formulation differs from the ideal boson picture in IBM.
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  DIRECT SIMULATION OF DEEP INELASTIC SCATTERING OF HEAVY-IONS (I) ONE PARAMETER DISTRIBUTION

  萨本豪, 苏宗涤, 张贵山, 施义晋, 黄祖洽

  理论物理通讯. 1982, 1(5): 569-580.

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  The distributions of dynamic variables in the deep inelastic scattering (DIS) of heavy-ions are studied by a direct simulation technique based on the single-nucleon-transfer-mechanism. The relative motion of the two collision partners is described by a Lagrange equation, and the transition probability of a single nucleon during the interaction time is calculated by the statisti-cal spectroscopy method.The occurrence of the transition event and the corresponding change of the dynamic variables are both treated randomly according to the transition probability. The calculated results for the reaction of ⁴⁰Ar+⁵⁸Ni(E_L=280MeV) are compared with experimental data.
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  FURTHER STUDY OF SEVERAL PHYSICAL EFFECTS ON THE CALCULATION OF ANGULAR DISTRIBUTION BASED ON EXCITON MODEL

  孙于阳, 王书暖, 张竞上, 卓益忠

  理论物理通讯. 1982, 1(5): 581-589.

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  In order to understand angular distribution deviation betweep the calculation based on conventional exciton model of the preequilibrium and equilibrium decays and the experimental data,especially the underestimate of angular distribution by the theory at backward angles, an exact closed form solution to the time-integrated master.equation of the exciton model by including the effects of the Fermi motion, the Pauli principle, the finite nuclear size and the refraction of the incident wave at the nuclear surface is applied to the calculation of the angular distribution, In this paper the neutron inelastic scattering cross sections.for 34 elements at 19.6 MeV have been calculated and compared with experimental data measured by Hermsdorf et al.The results show that because the influence of several: physical effects mentioned above has been taken into account the theory can explain the presently available experimental data and is especially suitable for solving the problem of the double differentia1; cross section for emitted neutrons with higher energy at backward angles.
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  TOTAL PHOTONUCLEAR CROSS SECTION IN THE 3,3 RESONANCE REGION

  余自强, 徐承先, 马维兴

  理论物理通讯. 1982, 1(5): 591-596.

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  The quasi-△₃₃ doorway state model, previously developed for describing pion-nucleus scattering, is used to obtain the re-sonant part of the photo-nucleus scattering amplitude, An inve-stivation of the photo-excitation of △(1232) states in nuclei provides information about the properties of nuclear △-hole excitations complementary to that obtained from pion-induced processes.
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  THE VIRTUAL EXCHANGE OF PSEUDOSCALAR MESONS IN THE MIT BAG MODEL

  朱伟, 沈建国

  理论物理通讯. 1982, 1(5): 597-606.

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  In this paper the virtual exchange effect of pseudoscalar mesons in the MZT bag model is discussed and the mass spectrum of hadrons,the magnetic moment's and the mean square values of charge radius are calculated. It is pointed out that our model can pre-serve and improve the static properties of the MIT bag model and provide an explanation for the origin of the meson cloud outside.
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  SL(2,R) PRINCIPAL PROLONGATION STRUCTURES OF SOLITON EQUATIONS AND THEIR CONSERVATION LAWS

  郭汉英, 吴可, 向延育

  理论物理通讯. 1982, 1(5): 607-615.

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  We present the concept of principal prolongation structure (PPS) and a covariant criterion of the completeness of conserva-tion currents for the PPS of class of nonlinear evolution equations (NEES).The SL(2,R) × R'(l) PPS for AKNS systems is constructed, a new set of infinite number of polynomial conservation currents (PCCs) corresponding to the nonlinearity of SL (2,R) group manifold is given. These currents together with the usual PCCS of AKNS systems satisfy a covariant equation for the SL(2,R) × R'(l) PPS. This equation gives rise to a criterion of completeness of these currents. As an example,the sine-Gordon system is analysed.
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  INFORMATION ABOUT SUBQUARK FROM EXPERIMENTS ON SUPERNIGH ENERGY COSMIC RAY

  高崇寿, 何祚麻

  理论物理通讯. 1982, 1(5): 617-627.

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  In this paper a kind of fireball model for subquark stratum is proposed, which can be used to explain the cosmic ray experiments for superhigh energy range, e. g., the mean multiplicity of secondary particles increases as S increases average transversal momentum ⊥> increases as S increases …etc. It can also give predictions which can be verified experimentally. This means that the information of the existence of subquark can be probed in the experiments on superhigh energy cosmic ray. Furthermore, this also means that some new phenomena observed in the experiments. on superhigh energy cosmiq ray provide. probably this kind of information.
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  ORDER α_S QCD CORRECTIONS IN DOUBLY DEEP TWO-PHOTON PROCESSES

  张礼

  理论物理通讯. 1982, 1(5): 629-642.

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  order α_S QCD corrections to the Process γ^* +γ^* → 2 jets are calculated in the case where both p力otons are far off shell and spacelike, with q₁²/q₂² and S=(q₁+q₂)² fixed. Compared with the leading Iog approximation results, the scaling of the 2-jet cross-section is still. preserved while the angular distri-butibn gets some corrections.
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  STUDY OF THE REACTION K^-p → π^o Λ

  Fazal-e-Aleem, Mohammad Saleem

  理论物理通讯. 1982, 1(5): 643-648.

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  It is shown that at high energy all available data for differential and integrated cross sections and the Λ-polarization in the reaction K^-p → π^o Λ can be fitted by using a simple Regge pole model with phenomenological residue functions. The characteristics of helicity and helicity non-flip amplitudes are also examined.
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  A DISCUSSION OF ANOMALOUS MAGNETIC MOMENT OF QUARKS AND LEPTONS IN A SUBSTRUCTURE MODEL

  黄涛, 谢诒成

  理论物理通讯. 1982, 1(5): 649-654.

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  In this paper we present a discussion on anomalous magnetic moment of a massive fermion and leptons in a substructure model, in which quarks and leptons are composed of a massive fermion and a massive scalar boson. we have obtained some limitations on their masses and charges.
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  COMPOSITE MODEL OF QUARKS AND LEPTONS WITH ELEMENTARY SCALARS

  东方晓, 杜东生

  理论物理通讯. 1982, 1(5): 655-658.

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  The model in Ref.[5] is modified to include three doublets of quarks and Leptons so as to recover quark-Lepton symmetry. The second model is constructed from two elementary scalars and a fermion and is therefore more economical.
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  AN EXPLANATION TO THE INCONSISTENT PHENOMENON BETWEEN MEAN MULTIPLICITY AND AVERAGE TRANSVERSE MOMENTUM IN COSMIC RAY EXPERIMENTS WITH SUPERHIGH ENERGY OF E > 10¹⁵ eV

  高崇寿, 何祚麻

  理论物理通讯. 1982, 1(5): 659-660.

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  The rapid increase of both and T> as S increases in superhigh energy cosmic ray experiments manifests some inconsistencies with the 1> ≤ π/4 S^1/2 rule. It is shown that these inconsistencies can be weakened with the assumption that only the secondary particles of the small fireballs are measured in the Ashtonsr experiment ^[3], but still not removed.
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  ON THE PROLONGATION STRUCTURE OF ERNST EQUATION

  郭汉英, 吴可, 向延育, 王世坤

  理论物理通讯. 1982, 1(5): 661-664.

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  An SL(2R) ×R¹(l) prolongation structure of Ernst equation with a real parameter l and the corresponding Riccati equation as well as a pair of linear equations which are in principle equivalent to the inverse scattering problem due to Belinsky and Zakharov are obtained by solving the fundamental equation for the prolongation structure. A necessary condition which should be satisfied by the Bäcklund transformations is pfesented in terms of prolongation structure. And it is indicated that in the, case of Ernst equation the Harrison transformation, Neugebauer transformations and other available Bäcklund transformations as well as Belinsky-Zakharov's Riemann transformation, i.e., the homogeneous Hilbertproblem (HHP), would be covered by this condition.
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  A STATISTICAL PHYSICAL INTERPRETATION FOR THE THERMODYNAMIC FORMULATION dS/dt=diS/dt+deS/dt

  黄惠慈

  理论物理通讯. 1982, 1(5): 665-668.

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  In this paper, an interpretation for the thermdynamic formulation dS/dt=diS/dt+deS/dt on the basis of statistical physics is given. According to this interpretation the internal endtropy production diS/dt is due to all the direct transition processes and the external entropy flow deS/dt due to transition dt processes occurring between the system and its environment, while the detailed balance for these transitions does not hold.