1990 Vol. 14, No. S2

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Design and Construction of the Barrel Shower Counter in the Beijing Spectrometer
Zhou Yuehua, Lu Changguo, Gu Weixin, Lu Weida, Que Youkun, Li Peiqin, Hao Wei, Zhou Li, Zhu Guosheng, Zheng Xiaoming, Chen Wenjun
1990, 14(S2): 105-113.
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 ...
Study on Radiation Damage of Chinese-made High-Z Scintillation Crystals
Zhu Guoyi, He Jingtang, Gu Yifan, Qian Zhongmin, Chu Guozhu
1990, 14(S2): 115-124.
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...
Optimization of the BEPC Positron Source
Pei Guoxi, Xie Jialin, Zhou Shu, Sun Songlan
1990, 14(S2): 125-134.
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...
One π-meson and One σ-meson Exchange Potentials at Finite Temperatures
Zheng Guotong, Su Rukeng
1990, 14(S2): 135-144.
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...
Variational Analysis of the Gross-Neveu Model at Zero and Finite Temperatures
Lou Senyue, Ni Guangjiong
1990, 14(S2): 145-153.
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...
Ratios of the Yields of Charmed Baryon to Meson in e+e- Annihilation
Chen Esheng, Xie Qubing
1990, 14(S2): 155-161.
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.
Exact Solution for a 1 + 1 Dimensional Lattice U (1) Gauge Model
Zheng Bo, Guo Shuohong
1990, 14(S2): 163-167.
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 Direct Check for G(1590) as 0++ Glueball Candidate
Yu Hong
1990, 14(S2): 169-171.
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...
On the Electric Dipole Transition of ψ (3770)
Qin Danhua, Ding Yibing, Chao Kuangta
1990, 14(S2): 173-177.
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) (...
Nonlinear Effects and Target Mass Dependence in High Energy Nucleus-Nucleus Collisions
Zhuang Pengfei, Liu Lianshou
1990, 14(S2): 179-187.
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...
Correlation Between Grey Particles and the Number of hN Interactions Inside a Nucleus in High Energy hA Collisions
Wang Haiqiao, Cai Xu
1990, 14(S2): 189-193.
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...
The Competition Between Transfer and Fragmentation Processes in 20Ne (14.7 MeV/u, 19.2 MeV/u) Induced Reactions
Zhu Yongtai, Hu Xiaoqing, Shen Wenqing, Li Songlin, Zhan Wenlong, Zhang Zhen, Zhu Xiang
1990, 14(S2): 195-199.
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 Application of IBM and IBFM in the Rare Earth Region
Xi Jinhua, Sun Hongzhou
1990, 14(S2): 201-209.
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...

ISSN 1674-1137 CN 11-5641/O4

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