Chinese Physics C

1996 Vol. 20, No. 3

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Review

Measurement of D_s Decay Constant

BES Collaboration

1996, 20(3): 193-203.

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Abstract:
Using the method of tabing a μ first, then checking the recoil side to see if it is a D_s meson, two D_s→μv and three D_s→τv→μvvv candidate events are found from a data sample corresponding to 22.3ph^－1, which has been collected at BES at E_cm=4.03GeV.The...

A Two-Dimensional Poeition Sensitive Multi-Stage Detection System with a Wide Dynamic Range for Heavy Ion Reaction

Wang Jinchuan, Zhan Wenlong, Guo Zhongyan, Xi Hongfei, Zhou Jianqun, Zhao Yondong, Lei Huaihong, Luo Yongfeng

1996, 20(3): 204-210.

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Abstract:
A two-dimensional position sensitive multi-stage detection system with a wide dynamic range for heavy ion reaction has been developed. It consists of four parts: a gas filled axial ionization chamber(IC), a position sensitive silicon detector(PSSD)(4...

Internal Massive Fermion Loop Contribution to Casimir Force in Two-Dimensions

Zheng Taiyu, Li Changsong

1996, 20(3): 211-215.

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Abstract:
In this note, using Feynman path integual method we calculate the Casimir effct of QCD with massive fermion loop contribution between two parallel perfectly conducting wires at zero temperture.

Bosonic Formulas for the Boundary state of SU(2) Thirring Model

Wang Yanshen, Shi Kangiie, Yang Wenli, Zhao Liu, Hou Boyu

1996, 20(3): 216-225.

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Abstract:
The boundary S matrix for the SU(2) Thicking model is derived and the boundary state is constructed with the bosonic field.

Gao Xiaochun, Gao Jun, Fu Jian

1996, 20(3): 226-233.

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Abstract:
On the basis of the generalized invariant theory, the invariant-related unitary transfoumation method is developed and used to study the evolution of the third-quantized wave function of the universe. The expressions for the phases and the wave funct...

Glauber Theory on Transverse Energy Distributions in Ultra-Relatidstic Heavy Ion Collisions

Wang Zhengxing, Zhao Qiang, Tang Ping

1996, 20(3): 234-239.

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Abstract:
A geometrical model is proposed for the hansverse energy distributions in ultra-relativistic heavy ion collisions based on the Glauber theory. The calculable distributions dσ/dE_T for 60 and 200A GeV ¹⁶O+¹⁹⁷Au are in agreement with the data of CERN NA...

Shell Model Calculations for Light Neutron-Rich Nuclei

Zhang Changhua, Gu Jinnan

1996, 20(3): 240-245.

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Abstract:
A shell model calculation is carried out for nuclei with 9≤A≤14 and 3≤Z≤5. In the calculation ⁸He is treated as a core. The data for 24 experimental energy spectra are selected to determine the parameters of the modified surface δinteraction (MSDI) a...

Validity of M-3Y Force Equivalent G-Matrix Elements for Calculations of the Nuclear Structure in Heavy Mass Region

Cheng Lan, Huang Weizhi, Zhou Baosen

1996, 20(3): 246-251.

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Abstract:
Using the matrix elements of M-3Y force as the equivalent G-matrix elements, the spectra of ²¹⁰Pb,²⁰⁶Pb, ²⁰⁶Pg and ²¹⁰Po are calculated in the framework of the Folded Diagram Method. The results show that such equivalent matrix elements are suitable ...

Applications of 1/N Expansion Technique

Zhang Qingying, Feng Mang, Chen Xiaolin, Wang Baolin

1996, 20(3): 252-258.

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Abstract:
The theoretical expressions of energy spectrum and E2 transition probability in the sdIBMl derived by the 1/N expansion technique with high order modified terms are applied to the nuclei in the uranium region. The agreement between theory and experim...

Vibrational and Rotational Motions Model of Nucleus (Ⅱ) Analyses of Normal Bands of Odd A Nuclei

Hu Jimin, Xu Furong, Zheng Chunkai

1996, 20(3): 259-264.

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Abstract:
Nounal bands of the Well deformed odd A nuclei are studied with the cranking Bohr-Mottelson Hamiltonian. The condition of validity of the model and comparison with the Harris expansion are discussed.

Study of Radiative Decays of Ground-State Mesons With Screened Potential

Dong Yubing

1996, 20(3): 265-269.

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Abstract:
The flavor-changing raciative B decays and flavo-conserving radiative decays of groundstate mesons are studied with another screened potential model. The results are compared with the counterparts of the comell potential and El hassan's work.

Study of ¹¹Li-Induced Reactions via QMD Model

Zhang Xiaodong, Ge Lingxiao

1996, 20(3): 270-276.

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Abstract:
The energy and isospin dependent nucleon-nucleon cross section is incorporated in the QMD model. The numerical stable ¹¹Li nucleus is sampled by using the harmonic oscillator type density. The total reation cross section of ¹¹Li+¹²C is studied in det...

A Folding Model for ¹⁶O+¹²C System

Li Qingrun, Yang Yongxu

1996, 20(3): 277-279.

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Abstract:
A folding model for the ¹⁶O+¹²C system is established.This model can well describe the elastic scattering between ¹⁶O and ¹²C nuclei.

Angular Distributions for the Process e⁺e^－→J/ψ→γ+X(J^PC),X→BB and Spin-Parity Analysis of the Resonance X

Zhang Lin, Yu Hong, Shen Qixing

1996, 20(3): 280-285.

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Abstract:
Using the helicity angular distribution method we analyse the process e⁺e^－→J/ψ→γ+X(J^PC),X→BB. The angular and the projection angular distribution formulas for different spin-parity of the resonance X are obtained. With these formulas, we determine th...

Synthesis and Identification of the New Transuranium Neutron-deficient Isotope ²³⁵Am

Guo Junsheng, Gan Zaiguo, Liu Hongye, Shi Lijun, Yang Weifan, Mou Wantong, Guo Tianrui, Fang Keming, Shen Shuifa, Yuan Shuanggui, Zhong Jiquan, Zhang Xueqian, Qin Zhi, Ma Ruichang, Wang Shuhong, Kong Dengming, Qiao Jimin

1996, 20(3): 286-288.

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Abstract:
A new neutron-deficient isotope ²³⁵Am was synthesized in the reaction of ²³⁸Pu (p, 4n) ²³⁵Am by using 35MeV proton bombarding ²³⁵Pu target. The Products were transported by the He-jet system. The Am was seperated from the reaction products using radi...

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Monthly issued, founded in 1977