1986年, 第6卷, 第2期　
刊出日期：1986-09-15

  

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  SYMMETRY PROPERTIES OF NEMATIC LIQUID CRYSTALS WITH SIMPLE CURVATURE STRAIN

  欧阳钟灿, 谢毓章, 徐亦庄

  理论物理通讯. 1986, 6(2): 95-105.

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  In this paper we show analyticaliy that,in general,nematic liquid crystals (NLC) with curvature strain belong to the C₁[1] point group.However,NLC with simple splay deformation or simple bend deformation possess C_2V[mm2] symmetry and those with simple twist deformation possess D₂[222] symnetry.
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  THE RESEARCH OF ELECTRONIC PROPERTIES OF HYDROGENATED а-Si

  房明, 吴翔

  理论物理通讯. 1986, 6(2): 107-115.

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  We first used Bethe lattice method and coherent potential approximation method to calculate the densities of bulk and surface states for a-Si,a-Si:H. The ideal vacancies were also studied.The results agree with experiments and other works.Dihedral disorder contributes to the submerging of a peak and sp peak of the valence band.In hydrogenated case,extra structure appears in the spectrum of densities of surface states.Doped hydrogen affects the densities of bulk states in the gap in principle,but hydrogen is not important for densities of surface states in the gap.Finally,we obtained self-energies which are in good.agreement with the empirical results from experiments and other methods^[1].
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  QCD SUM RULE AND MESON DISTRIBUTTON AMFLITUDE MOMENTS

  项晓东, 王新年, 黄涛

  理论物理通讯. 1986, 6(2): 117-139.

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  To include not only the perturbative effects but also the nonperturbative effects, the bac.ground field method is used in the OPE of two-point correlation function. The sum rules for the "lnonrents" of pion distribution amplitude are obtalned by using this method. We find that the values of "moments" are much larger than their perturbative values at intermediate Q². This result Indicates that the behavior of pion distribution amplitude is much broader than its asymptotic behavior at intermediate Q².
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  SCATTERING OF u TO ū ON THE SU(5) COLORLESS MAGNETIC MONOPOLE

  马中骐, 汤拒非

  理论物理通讯. 1986, 6(2): 141-165.

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  The scattering of quark u to antiquark u^C on the SU(5) colorless magnetic monopole is discussed in some detail.The baryon number non-conserved processes occur to the state j=1/2 and j=3/2 of the third type solutions. Solving the radial equation with j=1/2 and j=3/2 numerically,we show that the plane wave of quark u with helicity-1 can be scattered by the colorless monopole into antiquark u^C with the cross section σ=2π/p2.
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  B?CKLUND TRANSFORMAT ION AND CONS ISTEivCE OF REGULAR RIEMANN-HILBERT TRANSFORM

  葛墨林

  理论物理通讯. 1986, 6(2): 167-174.

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  The B?cklund Transformation presented by Chau et al. is reproduced as a self-consistent regular Riemann-Hilbert transform, so that it might correspond to a kind of non-solitonic transformation.
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  A Λ-N POTENTIAL

  刘东升, 沈建平, 厉光烈, 余友文

  理论物理通讯. 1986, 6(2): 175-185.

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  In this paper, a Λ-N potential is presented. The long and medium range parts of this potential are given by the OBEP(κ+η+ω+η+Φ) and TBEP(2π+πp),while the short range part by a phenomenological soft core. Based on the Λ-N potential, the Λ-separation energies and the spectra of ?He and ?H as well as the s-wave phase shifts and the cross section of the Λ-N elastic scattering are calculated.The results are in good agreement :with the experimental data. Finally, the Λ-well depth innuclear matter is discussed.
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  ON THE REACTION MECHANISM AND THE SELECTION RULE IN THE DOUBLE CHARGE EXCHANGE REACTION OF PIONS ON NUCLEI (DCX)-A STUDY OF THE CONNECTION BETWEEN THE 2β-DECAY AND DCX ON j^P=O⁺ NUCLEI

  庆承瑞, 何祚麻, 赵维勤

  理论物理通讯. 1986, 6(2): 187-194.

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  It is shown that in the pion induced double charge exchange reaction on J^p=O⁺→O⁺ nuclei,there exists a possible new reaction mechanism π⁺(Δ⁰,Δ⁺⁺)π^- or π⁺(Δ^-,Δ⁺)π^- in so-called single step process,while that old speculative mechanism π⁺(N,Δ)π^- or π⁺(N,Δ)π^- is firbidden by a well-known selection rule which has been indicated in the theory of the nuclear 2β-decay.