ELASTIC SCATTERING OF HADRONS FROM NUCLEI AT HIGH ENERGY AND THE SHORT RANGE CORRELATION IN NUCLEI

The effects of short range correlation in nuclei on elastic scattering of hadronsfrom nuclei at high energy are studied by means of Glauber multiple diffraction the-ory, using Jastrow correlated wave functions. To this end, a determinant form ofJastrow correlated wave functions is used. Calculations have been carried out for π^--¹²C elastic scattering at 260 MeV, and they are compared with the experimentdata. The results show that the influence of the short range correlation on the dif-ferent cross section is quite important.     

QCD PERTURBATION THEORY OF CONFINED QUARKS AND GLUONS AND THE COMPONENTS OF SEA QUARKS WITHIN A PROTON

The on shell and the off shell formulisms of the gluon propagators in a system of confined quarks and gluons are discussed, and the components of sea quarks found in a proton are calculated on the basis of the static spherical cavity approximation of MIT bag model. It is shown that the off shell results are obviously smaller than those of the on shell approximation.     

SURFACE ENERGIES OF ATOMIC NUCLEI AND THE MASS OF THE SCALAR MESON

Assuming that the nuclear binding is dominated by a real scalar meson field,the mass of this meson is calculated to be 472 MeV from the nuclear surface tension coeffici-ent,by Thomas-Fermi method and Van der Waals approximation.The agreement between this value and the mass of a chief scalar meson in the OBEP theory of nuclear force indicates that a more serious investigation of above assumption should be valuable.     

MKdV方程的微扰理论

求得了含微扰的MKdV方程u_t+6u²u_x+u_xxx=εR［u］一级近似解的一般表达式,以及一个特例的具体表达式. 关键词：     

自发辐射的线宽与原子能级移位

在本文中,我们对二能级原子的自发辐射问题进行了讨论。我们用原子自发辐射的实际场代替自由场同原子相互作用,并由自洽的条件计算谱线的线宽与原子能级的移位。计算方法也不同于前人的方法。计算的能级移位不出现发散的困难。 关键词：     

THE PERTURBATION EXPANSION OF THE QUANTIZED COMPOSITE FIELD THEORY AND GAUGE INVARIANCE

In this paper we introduce the concept of "same order" in the perturbution expansion of the quatized composite field theory which is different from single particle theory. For example, in the case of Q. E. D., "same order" is defined by means of a coupling constant, but here it closely relates the operators occuring in the B. S. equations. Feymann graphs of the "same order" are defined for different kinds of transitions in the composite field theory. Finally, we prove that guage invariance is a natural result as long as all "same order" Feymann graphs are calculated for an electromagnetic transition between composite particles.     

THE IMPROVED HAM1 LTONI AN AND ρ-ω MASS DIFFERENCE IN LATTICE GAUGE THEORY+

We formulate a Hamiltonian theory on the lattice including next-to-nearest neighbor fermion interactions. A canonical transformation is made to induce a momentum-dependent mass term. The meson spectrum is studied by using this Hamiltonian. The current algebra formula for the pion mass is derived. The ρ-ω mass ratio in the intermediate coupling region is in agreement with the experimental value.     

PERTURBATION TO THE SYMMETRIES AND ADIABATIC INVARIANTS OF HOLONOMIC VARIABLE MASS SYSTEMS

The perturbation problem of symmetries for the holonomic variable mass systems under small excitation is discussed. The concept of high-order adiabatic invariant is presented, and the form of adiabatic invariants and the conditions for their existence are given. Then the corresponding inverse problem is studied. Finally an example is presented to illustrate these results.     

基本粒子的质量关系和层子相互作用

本文利用重子和介子的SU(6)波函数,讨论强子内部的层子作用,分析各个质量关系的动力学根源,建立重子和介子质量的联系,并求得了几个联系二者的新关系:(ρ-π)/(K^*-K)=(△-N)/(Σ^*-Σ), 4(∧-N)=3(K^*-ρ)+(K-π), (ρ-π)/(△-N)=((φ-ρ)-2(K-π))/(2(Ω-△)-3/2(K-π)-9/4(φ-ρ)).研究了它们的成立与层子-层子力和层子-反层子力的对称性的联系。     

晶体中电子的有效质量与能带曲率的关系

通过晶体电子有效质量和曲线曲率的定义，说明晶体电子的有效质量与能带曲率的大小一般没有什么联系，只有在能带极值处才有电子有效质量的大小反比于带曲率的比例关系。     

无简并微扰论公式的研究

本文介绍了Ｗｉｇｎｅｒ公式，Ｇｏｌｄｓｔｏｎｅ公式与Ｓｃｈｒｏｄｉｎｇｅｒ公式及其递推形式，比较表明，Ｓｃｈｒｏｄｉｎｇｅｒ公式的递推形式更容易利用计算机程序实现。文中还给出了逐级计算非连通项到任意级的方法。     

非简谐振子自由能的微扰展开

推导出正则系统的特性函数－自由能分别在经典情况及量子情况下的生扰表达式，并对非简谐振子自由能的微扰展开进行了具体计算。     

关于复合场场论的微扰展开式

本文根据以Bethe-Salpeter波函数所定义的渐近条件为基础的复合场场论而导出了相互作用表象中相应的微扰展开式,应用这一展开式讨论了层子模型计算方法中如何选择费曼图的问题。     

衍射问题一级近似的微扰理论

作者应用微扰理论首先导出了顶角接近π的平面扇形导体衍射场与θ接近π/2的橢锥导体衍射场的微扰项之表达式,因此,对其相应的简单问题——导体半平面屏的衍射与导体平面的反射,也得到了相应的微扰项之表达式。然后,按照文献[10]中所提出的原理,以内接多边形代替一般形状的导体薄片,以许多内接小橢锥面组成的曲面代替一般形状的导体表面,分别将上述微扰对多边形各顶点及曲面各内接锥顶求和。在极限情况下,求和变为积分,从而分别导出了任意形状的导体薄片(因而导体平面屏上的开孔)与导体表面衍射的一级衍射场,它们是对几何光学场的一     

DEPENDENCE OF PHASE TRANSITION ON THE MASS NUMBER OF HOT NUCLEI

The dependence of phase transition,associated with the disassembly of hot nuclei,on the mass number of hot nuclei is investigated.By studying six hot nuclei ranging from ⁵⁶Ni* to ²³⁸U*,we find that in the curves of excitation energy of hot nuclei vs.Thermodynamic temperature T(E*) of ⁶³Cu* and heavier ones there are always two temperature plateaus,but in T(E*) of ⁵⁶Ni the first temperature plateau (at lower excitation energy) shrinks into a kink.     

简并微扰论递推公式的一个应用实例

利用作给出的简并微扰论的递推公式，对一个简单的例子导出Ｎ≤４级能量修正与波函数修正的解析表达式，结果与精确解的级数展开式完全一致。     

MASSES OF THE LIGHT HADRONS AND SELF-ENERGIES IN THE BAG MODEL

The masses of the light hadrons are calculated in terms. of the cloudy bag model with use of pion-energies due to both gluon and pion exchange. By use of a type of pion-guark interaction which incorporates the finite extent of the pion the convergent self-energy due to pion exchange is obtained. The difficulties in the bag models which only include one type of the self-energies can be removed by. taking account of both and the baryon spectrum is reproduced well. It is found that these self-energies are large but have opposite effect on the masses of the hadrons.     

固体中稀土离子的能级位移和电子云扩大效应

本文计算了25个含Eu³⁺离子的晶体中由于晶场效应引起的Eu³⁺离子的⁵(D_J),⁷(F_J)能级的位移和⁵D,⁷F谱项能级劈裂的加宽,分析了电子云扩大效应引起的能级位移与实验测量值的关系,并给出这些晶体中电子云扩大效应大小的正确次序。 关键词：