1991 Vol. 15, No. 3
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in this paper,the beam optics of an electric multipole lens containing aberrations is established,the aberration matrix is derived,and its determinant is shown to be unit.When the beam travels through an electric multipole lens and the aberrations exist,the electron beam theory for ellipsoid in phace space is still valid.
This paper discusses the basic principle of the magnetic axis measurement on the magnetic field of the solenoid magnet for BES,the measuring method as well as the result.
The effects of QCD vacuum condensate on hardron structure function are considered.Based on the background field theory,starting from the effective lagrangian of QCD we calculate the non-perturbative correction to ratio R=σL/σT of the hardron structure function.Our corrections are sensitive at small x regions.
In this paper,the background field quantization is used to calculate the one-loop β function in the Toy Model which has the strong coupling and the SU(3) symmetry.the function obtained is consistent with the Appalquist-Carrazone theorem in the low energy condition.
Particle production process in nucleon-collisions is described in two fireball model.The negative particle rapidity distribution data of NA35 are fitted very well by nuclear collision geometry.The strong relation between n-(b) and b is found.
In this paper,the η-N interaction potential via the Channel:N*ηN is derived within the framework of quantum field theory.By using this η-N S wave scattering length and the potential well depth of η-meson in nuclear matter are calculated.It is shown that the theoretical value of the η-N S wave scattering length is in good agreement with that obtained by analysing the πN scattering experimental data and our computational result for the potential well depth of η-meson in nuclear matter is about the same as other theoretical predictions for finite nuclei.
According to the theory of charged particle transportation the beam optics principle of the ISOLAN facility was deduced.The basical parameters and the layout of the facility were also described.
The phase transition of low-lying energy spectrum structure for Ba isotopes and Sm isotopes are studied in the framework of microscopic IBM-2 based on the boson expansion.It seems possible to describe the phase transition in a unified way within the approach.
An improved treatment on staggering phenomenon in nuclear energy spectrum in the framework of IBM2 is described in this paper, The hamiltonian is introduced to treat the even-even isotopes of Ru and Pt.The relation between the staggering phenomenon and the quadrupole-quadrupole interaction is discussed.
The α-transfer rates of ground states in medium and heavy nuclei are obtained analytically in a two-level pairing force model of j-j scheme.It is concluded that,like the pair-transfer,there is a blocking effect in α-transfer reactions because of the single and unpaired nucleon. This is accordance with the experimental facts.
By utilizing the 1/N expansion technique,the SU(3)-symmetry breaking caused by boson energies is discussed for the sdg Interacting Boson Model,and the analytical expressions of the intrinsic states are given under the approximation in the order of 1/N.It is also shown that the many body theories for a interacting boson system,such as Hartree-Bose method.Tamm-Dancoff approximation and Cranked Hartree approximation,are all special cases of the 1/N expansion technique.
Three million J/ψ events have been obtained at Beijing Electron and Positron Collider (BEPC) and Beijing Spectrometer (BES) by Aug.1990 and some preliminary analysis have been performed.It is expected that 1—2×107 J/ψ events will be accumulated during 1991 In this paper we give a review about some new hadron states which may appear in J/ψ decays and how to determine the spin-parity of these new hadron states by using the generalized moment analysis.
The continuous medium model with variable densities is used to calculate the macroscopic potential energy surfaces of β-stable nuclei with A≥100.The reasonable fission barriers are obtained and the double mass center charge distributions of fissioning nuclei at saddle points are predicted.
In the framework of the potential model for charmonium,the effects of 23S1-13D1 mixing between ψ(3770) and ψ(3686) are discussed.It is concluded that the possibility for the mixing angle θ=30° should be ruled out.While the results for both ψ(3770)→γχ0 and ψ(3686)→γχ0 are improved with θ=－10°,the contradiction between the theoretical value and the experimental value for ψ(3770)→γχ1 still remains.
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