Vertex Correction at Finite Temperature and Decoupling Transition in (2+1) Dimensional Chiral Gross-Neveu Model

With the aid of imaginary time temperature field theory and fermion mass spectrum derived from Ward-Takahashi identities with composite fields,the vertex correction among fermions and σ meson is calculated beyond the leading order in 1/N expansion,and the change of vertex function with temperature and decoupling transition are discussed in (2+1) dimensional chiral Gross-Neveu model.It turns out that the critical temperature of decoupling transitionarises with increasing fermion mass and π meson mass at zero temperature;the vertex correction resulting from thermal fluctuation will affect the fermion dynamical mass and cannot be ignored at finite temperature.     

Deuteron Properties in the Chiral Quark-Soliton Model

The deuteron ground state mixed with ³D₁ state is caused by the tensor potential of one meson exchange between two quarks.The properties of the deuteron ³S₁+³D₁ ground state are calculated with the chiral quark-confinement soliton model.     

A Possible Origin of e+e- Peaks in Heavy-Ion Collisions

The behavior of a neutral composite particle composed of a positron and an electron in the strong Coulomb field of a nuclear uquasimolecule formed in low-energy heavy-ion collions is examined. A strong attractive interaction between the composite particle and the Coulomb field is found when the combined nuclear charge of two nuclei is sufficiently large, which is possible to lead to the e⁺e^- pair production in heavy-ion collisions.     

A Chiral Quark-Confinement Soliton Model for one nucleon and two Nucleons

A chiral quark-meson soliton model with quark-confinement is described in the present work.This model can reasonably produce the static properties of single nucleon,nucleon-nucleon interactions and elastic scattering phase shifts.     

Chiral Symmetry,Ward-Takahashi Identities and Mass Spectra in (2+1) Dimensional Chiral Gross-Neveu Model

Chiral Ward-Takahashi identities with composite fields are applied to investigate mass spectra in (2+1) dimensional chiral Gross-Neveu model.The fermion mass and bound state spectra are obtained,which are in agreement with large-N expansion in the lowest approximation.When the chiral symmetry is an approximate one,we obtain the PCAC.     

Mass Splittings of L=1 States of Quarkonium and Lorentz Structure of Long-rang Confinement Potential

The Lorentz nature of linear confinement potential of quarkantiquark pair is analyzed in the potential model by using the fine mass splittings of L=1 spin triplets in cc and bb systems.It is found that the linear confinement potential has a mixed nature of the Lorentz scalar and vector (0≤η≤29%,η=0 represents the pure Lonentz scalar).For the tentatively measured χ(1¹P₁) and γ(1¹P₁) meson masses,it is shown that the pure Lorentz scalar of the linear confinement potential is required to obtain the mass of the former meson,while the mixture of 79% Lorentz scalar and 21% Lorentz vector is required to explain the mass of the latter one.     

Relations Between Focusing Power of Space-Charge Lenses and External Electromagnetic Fields

Under different external electromagnetic fields,the electron densities of the electron cloud in a self-sustaining space-charge lens are measured with the radio-frequency method and the energy distributions of the ions produced in ionization are measured with the stopping field method.From them the relations between the focusing power of space-charge lenses and the external electromagnetic fields are determined.The available region of the Lebedev-Morozov formula is discussed.     

Constraint on the Parameter of Group By Two Order Transformation of Field Variable Being Equal to Zero in Non-Abelian

A sufficient and necessary condition that two order transformation of field variable in non-abelian gauge field is equal to zero is derived.Two order transformation of both the parameter of Group and field variable of Fermi fields are necessarily equal to zero.     

SEARCHING FOR HIGGS BOSONS IN WEINBERG-SALAM MODEL BY LONGITUDINAL POLARIZED e+e→γ+H→ff REACTIONS

Using the Primakoff effect of longitudinal polarized reactions e+e→γ+H+ff which would have extremely sharp peak both in the forward and backward cross sections, one could hopefully observe Higgs bosons in W-S model and determine its mass experimentally.     

大孔阳离子交换树脂内UO2^2^+被加速传质的起因及规律

研究了大孔阳离子树脂内碱土、3d过渡元素和稀土等离子对UO2^2^+加速传质的起因及规律。发现,树脂内磺酸根及与之结合的金属离子周围水合数的降低是导致UO2^2^+被加速传质的起因。因此,同价离子对UO2^2^+的加速效应一般随其离子半径的加而增大,但加速离子起因不同的电子结构具有特强的键合力时,会使其加速效应发生异常。