The Chiral Anomalies in W and Z Decays

Some of the important W^± and Z decay amplitudes, relating to the chiral anomalies of the quark sector in the Standard Model, are given by means of the interactions determined by the effective Lagrangian (action) of the nonlinear δ model for the pseudogoldstone bosons. The corresponding decay rates are calculated. It is shown that the decay rates are quite large, especially, the rate of the decay W→πγ and probably that of W→ D₀γ are predicted being unexpectedly great (Г_W→πγ = 0.35 GeV). This indicates that the chiral anomalies and our approach should receive tests from SPPS and Tevantron experiments.     

THE EFFECT OF PION CONDENSATION IN HIGH ENERGY PROTON-NUCLEUS SCATTERING

According to the prediction made by A.B. Migda, a pion condensate should already be present in ordinary finite nuclei, We have studied the effect of pion condensate in high energy proton-nucleus scattering by using the Glauber multiple scattering theory, A calculation has been performed for P-⁴⁰Ca elastic scattering at the incident energy of 1 GeV and compared with the data available. The results strongly indicate that pion condensate does not have an adequate, opportunity to manifest itself in high energy proton-nucleus scattering, at least so for small angle scattering.     

Cu在Pt表面扩散激活能和扩散系数的ASED-MO计算

本文应用ASED-MO方法,计算研究了Cu在Pt(111),(100),(110)表面的扩散问题。Cu原子在上述三个表面上的扩散激活能的计算结果分别为0.167eV,0.162eV和0.668eV;300K时的扩散系数分别为3.04×10¹⁰m²/s,3.69×10^-10m²/s和2.42×10^-18m²/s。计算结果表明,Cu原子在Pt(111)和(100)面上,扩散激活能很小,极易迁移,而在(110)面上,激活能较大,扩散系数甚小。     

布尔代数上的Fuzzy同余关系

引入了布尔代数上的Fuzzy同余关系的概念,讨论了布尔代数上的Fuzzy同余关系与布尔代数的Fuzzy理想之间的关系,给出了商布尔代数的同构定理。     

金属粉末样品NMR谱的分拆

介绍粉末谱数值计算的基本手续。推导了更具综合性和普适性的数学形式,作为计算机拟谱的前提。陈述程序中的若干考虑:所有跃迁吸收合成总谱时的权重处理,四极矩作用的涨落对单线展宽有贡献,而且这种效应对中心跃迁及伴线的影响各不相同。强调一套描述共振吸收的参数获得是基于对全谱型的最佳拟合以及在场强变化情况下各特征峰移动行为的符合。     

THE FORM FACTOR OF 28Si AND ITS ENERGY VARIATION

The charge fcrr factor of ²⁸Si and its energy variation are calculatedby using the statistical spectroscopic theory. A qualitative agreemznt between the theoretical results and the experimental data is obtained.     

论络合物中心过渡金属离子的径向波函数

考虑中心对称配体场影响,提出一种不同基混合的束缚态过渡金属离子的3d径向波函数。利用这种波函数,计算了一些Cu⁺⁺络离子的晶场谱。假设适当的边界条件,用一个拟合参数,就能得到和实验一致的结果。这种方法的实质在于,在晶体场静止点荷模型基础上,考虑了诸配体等效中心对称场的部份分子轨道效应。这种混合基单电子3d径向波函数也能用于完全的分子轨道理论计算。     

单光子和双光子电磁诱导透明谱的相干调制

采用一束相干外场作用在倒Y模型原子的基态与另外状态构成的跃迁上,实现对单光子和双光子电磁诱导透明谱的调制.经研究发现相干外场对单光子和双光子的吸收性质有类似的影响效果.由于相干外场的作用,吸收谱的共振点附近出现吸收峰将原单重透明谱分裂为双重透明谱.诱导的吸收峰的高度和透明谱的频谱宽度与相干外场的强度有密切关系.并用缀饰态理论解释了这些物理现象.这些研究对多通道光通信以及对原子光学性质的调控方面有积极意义.     

Polarized optical studies of ordered InGaP2 under pressure

In this paper, we discuss polarized photomodulated reflectivity (PR) and photoluminescence (PL) studies of MOCVD grown InGaP₂ epilayers lattice-matched to a GaAs substrate. These structures were grown on a (001) face with a misorientation of two degrees along <110>. The PR spectra of the ordered sample show a strong polarization dependence. For the electric field E parallel to [1̄10] two features in the PR spectra are seen; for E∥[110], however, additional features are observed. A comparison with the spectra of disordered samples of the same alloy composition has enabled a determination of the band gap reduction due to ordering. The linewidths of the PR peaks are approximately 5-10 meV which has enabled us to study them in detail as a function of hydrostatic pressure at cryogenic temperatures. The pressure dependence is slightly sublinear with the first order term of 8-9 meV kbar^-1 for pressures well below the Γ-X crossover. Also observed is the indirect level crossing which occurs under pressure at about 40-kbar. An analysis of PR lineshapes at 1-bar is also presented at several commonly used experimental temperatures.     

Large energy cumulants in the 2D Potts model and their effects in finite size analysis

We develop an ansatz for expressing the free energy of the two-dimensional q-states Potts model for q > 4 near its first order phase transition point. We notice that for the moderate values of q < 15, the energy profile at the phase transition is not expressible as a sum of gaussians. We discuss how this affects the traditional finite size analysis of this phase transition. In particular, the dominant length scale governing the finite size corrections turns out to be much (∼ 6 times) larger than the largest correlation length in the problem.