1990 Vol. 14, No. S2
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Abstract:
The design and construction of the Barrel Shower Counter (BSC) for the Beijing Spectrometer (BES) are described in detail. The BSC is a 3.85 m long cylinder with an inner diameter of 2.5 m and an outer diameter of 3.4 m, constructed on a 4.23 m long ...
The design and construction of the Barrel Shower Counter (BSC) for the Beijing Spectrometer (BES) are described in detail. The BSC is a 3.85 m long cylinder with an inner diameter of 2.5 m and an outer diameter of 3.4 m, constructed on a 4.23 m long ...
Abstract:
Radiation damage effects of several Chinese-made high-Z scintillation crystals have been studied on a 60Co irradiation unit of 100 kCi. Results on small size BGO crystals irradiated by 60Co γ-rays with various doses from 5×103 to 7.5×105 rad are pres...
Radiation damage effects of several Chinese-made high-Z scintillation crystals have been studied on a 60Co irradiation unit of 100 kCi. Results on small size BGO crystals irradiated by 60Co γ-rays with various doses from 5×103 to 7.5×105 rad are pres...
Abstract:
Based upon Monte Carlo simulation and particle tracing, the positron source of the BEPC is designed and the predicted performance is compared with the experimental measurement. It shows that they are in good agreement. Important conclusions are drawn...
Based upon Monte Carlo simulation and particle tracing, the positron source of the BEPC is designed and the predicted performance is compared with the experimental measurement. It shows that they are in good agreement. Important conclusions are drawn...
Abstract:
On the basis of the field theory at finite temperature, the dependence of π-meson and σ-meson effective masses upon temperatures at nucleon level and one π and one σ exchange potentials are discussed. The dependence of the π and σ effective masses up...
On the basis of the field theory at finite temperature, the dependence of π-meson and σ-meson effective masses upon temperatures at nucleon level and one π and one σ exchange potentials are discussed. The dependence of the π and σ effective masses up...
Abstract:
By means of the coherent state effective potential method, we re-examine the Gross-Neveu (GN) model. A "nontrivial" "Autonomous" theory is obtained for any N (N is the number of the fermion fields). When N→∞, the theory is equivalent to that obtained...
By means of the coherent state effective potential method, we re-examine the Gross-Neveu (GN) model. A "nontrivial" "Autonomous" theory is obtained for any N (N is the number of the fermion fields). When N→∞, the theory is equivalent to that obtained...
Abstract:
The ratios of the yields of charmed baryons to mesons in e+e- annihilations have been calculated by using the quark production rule and the quark combination rule. The results vary with energy √s and are in agreement with the available data.
The ratios of the yields of charmed baryons to mesons in e+e- annihilations have been calculated by using the quark production rule and the quark combination rule. The results vary with energy √s and are in agreement with the available data.
Abstract:
A 1 + 1 dimensional lattice U(1) gauge model is exactly solved. The results show that the lattice gauge model has a correct continuum limit.
A 1 + 1 dimensional lattice U(1) gauge model is exactly solved. The results show that the lattice gauge model has a correct continuum limit.
Abstract:
In this paper, the structure of the wide resonance peak produced in the J/ψ radioactive decay around 1.7 GeV is studied in terms of the generalized moment analysis[1], and a method of testing whether there simultaneously exist the Θ/f2(1720) and G(15...
In this paper, the structure of the wide resonance peak produced in the J/ψ radioactive decay around 1.7 GeV is studied in terms of the generalized moment analysis[1], and a method of testing whether there simultaneously exist the Θ/f2(1720) and G(15...
Abstract:
Various E1 transition rates for cc states are calculated in a QCD-motivated potential model. Relativistic corrections are found to be substantial. A good agreement between theory and experiment is achieved for the rates of ψ(2S)→YXeJ and XeJ→γψ(1S) (...
Various E1 transition rates for cc states are calculated in a QCD-motivated potential model. Relativistic corrections are found to be substantial. A good agreement between theory and experiment is achieved for the rates of ψ(2S)→YXeJ and XeJ→γψ(1S) (...
Abstract:
Two nonlinear effects in high energy heavy ion collisions-intranuclear cascade and interaction among secondary particles——are discussed. Their influence on the final-state-particle distribution and its target mass dependence are analyzed. Using the h...
Two nonlinear effects in high energy heavy ion collisions-intranuclear cascade and interaction among secondary particles——are discussed. Their influence on the final-state-particle distribution and its target mass dependence are analyzed. Using the h...
Abstract:
Considering the intranuclear cascade, a model describing the distribution of the number of grey particles in high energy hadron-nucleus collisions is proposed. An agreement between the model and experimental data is obtained. It seems that the number...
Considering the intranuclear cascade, a model describing the distribution of the number of grey particles in high energy hadron-nucleus collisions is proposed. An agreement between the model and experimental data is obtained. It seems that the number...
Abstract:
The inclusive momentum distributions of the projectile-like fragments produced in the reactions of 14.7 MeV/u, 19.2 MeV/u 20Ne + 58Ni are compared with the exclusive ones coincident with charged particles, detected in the forward 20 plastic scintilla...
The inclusive momentum distributions of the projectile-like fragments produced in the reactions of 14.7 MeV/u, 19.2 MeV/u 20Ne + 58Ni are compared with the exclusive ones coincident with charged particles, detected in the forward 20 plastic scintilla...
Abstract:
The interacting Boson model and the interacting Boson-Fermion model are applied to nuclei in the rare-earth region in this paper. The Q · Q Hamiltonians are introduced to treat the deformed nuclei in this region. The energy spectra and E2 transitions...
The interacting Boson model and the interacting Boson-Fermion model are applied to nuclei in the rare-earth region in this paper. The Q · Q Hamiltonians are introduced to treat the deformed nuclei in this region. The energy spectra and E2 transitions...
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Cover Story
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