1986年, 第6卷, 第3期　
刊出日期：1986-10-30

  

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  PLASMON SPECTRA IN METALLIC SUPERLATTICES

  薛登平, 蔡建华

  理论物理通讯. 1986, 6(3): 195-199.

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  We present results of a hydrodynamic study of the plagmon spectra in metallic superlattices by treating the different layeqs as jelliums.Interesting changes in the plasmon dispersions and relative growth and decline of the bulk and interface modes with modulatiqn wavelength and transversal wave vector are noted. A variation of the electronic effective mass with the modularion wavelength has also been found.
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  ON THE CHARGED PARTICLES MULTIPRODUCTION IN THE CENTRAL REGION OF THE SOFT HADRONIC INTERACTION

  吕景发, 陈之江

  理论物理通讯. 1986, 6(3): 201-210.

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  Using the Dual Partonic Model and combining with the FF quark fragmentation mechanism,the charged particle multiplicity in the central region are simulated by Monte-Carlo method.The variation of the charged particle multiplicity with total C.M. energy and the charged particle multiplicity distribution in central region as well as the sinqle-particle inclusive distribution are evaluated.The calculated values are in good agreement with recent experimental data.The results support the view point that the reexist colliding components in soft-collisions.
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  COMPARISON OF THE EFFECTIVE NUCLEAR INTERACTIONS IN NON-RELATIVISTIC AND RELATIVISTICM ICROSCOPIC CALCULATIONS

  马中玉

  理论物理通讯. 1986, 6(3): 211-219.

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  The microscopic calculations of the effective nuclear interactions in the Landav Fermi-Liquid theory were performed in the framework of both the nonrelativistic Brueckner theory and rela-tivistic mean-field theory. The Landau parameters obtained from the relativistic approach exhibit a strong density dependence.In the vicinity of the nuclear saturation density the strong density dependence of the scalar and isoscalar Landau parameter F₀ has somewhat eased up by the many-body force of nucleons.
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  THE INTERFERENCE EFFECTS BETWEEN ATOMIC AND NUCLEAR PROCESSES-FLUCTUATION PHENOMENA IN POSITRON SPECTRUM PRODUCED BY VERY HEAVY ION COLLISIONS

  张竞上

  理论物理通讯. 1986, 6(3): 221-236.

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  The positron spectra produced by very heavy ion collisions have been measured in GSI. The fluctuation phenomena occured in the positron spectra should be explained in terms of the theory on the interference effects between atomic and nuclear processes, i.e. the origin of this kind of fluctuation essentially comes from the stochastic property of compound ,nucleus.This paper shows the theoretical framework.
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  STABILITY OF TWO-COMPONENT BENARD FLUID WITH SURFACE ADSORPTION ACCUMULATION

  褚小麟, 陈燎原

  理论物理通讯. 1986, 6(3): 237-257.

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  A linear stability analysis for a two-component Benard liquid with surface adsorption has revealed a dual role for the surface tension arising from the surfactant-it plays a stabilizing role in some cases and a destabilizing role in others.We have introduced a dimensionless parameter-surface excess number,proportional to the concentration gradient of solute and inversely proportional to the surface adsorption accumulation,to describe the dual effects of surface tension.We predict the existance of a critical surface excess number and calculate its value for two different boundary conditions.Our results have solved the seeming1y contrary results obtahed by Berg and Palmer and Velarde.
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  NULL GEODESICS IN STATIONARY ERNST-WILD SPACE-TIME

  徐效海, 刘长富

  理论物理通讯. 1986, 6(3): 259-267.

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  Null geodesics in equatorial plane of stationary Ernst-Wild space-time representing a Kerr black hole immersed in axlsymmetric magnetic field are investigated.As the case of static Ernst space-time there are two types of geodesics which depend on a dimensionless parameter β of the magnetic field.Differing from the static Ernst space-time,however,the critical β_C now depends on a dimensionless parameter q of the angular momentum of the Kerr black hole,and the relation between β_C and q is qualitatively different in two cases:L>O and L<0 where L is a dimensionless parameter of angular momentum of test particles moving along nu11 geodesics.
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  A KIND OF NEW OPERATOR IDENTITIES RELATED TO SO₃ GROUP

  范洪义

  理论物理通讯. 1986, 6(3): 269-276.

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  In terms of the technique of perfoming integra-tion within ordered product we show the integra-tion appearing in the rotation operator ∫d³r^→|Rr^→ >< r^→|≡D(R) can be explicitly carried out and leads to a kind of new operator identities,their coherent state matrix elements are then easy to be computed.
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  THE ANALYTICAL RESULTS FOR U(1) AVERAGE PLAQUETTE ENERGY

  赵佩英

  理论物理通讯. 1986, 6(3): 277-282.

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  The average plaquette energy < E_p > of U(1) lattice gauge theory in d=3,4 and 5 dimensions is calculated by curnulant expansion.In each case the results are in agreement with those of Monte Carlo data^[1,2,3].
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  A GENERALIZATION OF THE Q.Q HAMILTONIAN FOR THE INTERACTING BOSON MODEL

  张玫, M. Vallieres, R. Gilmore, 孙洪洲, 冯达旋, Richard W. Roff

  理论物理通讯. 1986, 6(3): 283-290.

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  A simple Interacting Boson Model Hamiltonian involving only Q.Q and L.L terms is used to describe the Inversion of the β- and γ- bands in the rare earths. The model is used to describe this band inversion in the Hafnium isotopes.An inttrpreta-tion of this simple Hamiltonian in terms of the dynamical groups U(5),SU(3) and O(6) is presented.