1999 Vol. 23, No. 3

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Review
Possibility of Hubble Constant and Background Infrared Radiation Measurements With Yangbajing RPC Carpet Experiment
Jia Huanyu, Wang Shunjin, Tan Youheng
1999, 23(3): 217-222.
Abstract:
Considering the absorption of extragalactic high energy gamma rays by cosmic background photons, the possibility of measuring Hubble Constant and background infrared radiation with Yangbajing RPC carpet experiment is presented.The conclusion is that ...
Comparison Between Hot Nuclei Temperature Values Deduced by Two Methods in 40Ar+159Tb and natAg Reactions at 30MeV/u
Dai Guangxi, He Zhiyong, Fu Yanbiao, Duan Limin, Li Zuyu, Zhang Baoguo, Liu Guoxing, Wu Heyu
1999, 23(3): 223-230.
Abstract:
The temperature of hot nuclei was simultaneously deduced with double isotope ratios and with slope method at angle of 110°in 40Ar+159Tb and natAg reactions at 30 MeV/u. The values of isotopic temperature for different ratios, such as 1,2H/3,4He,2.3H/...
TOF Measurement in RIBLL
Li Jiaxing, Zhan Wenlong, Guo Zhongyan, Sun Zhiyu, Xiao Guoqing, Wang Jinchuan, Meng Xiangwei, Jiang Shanhong, Qin Lijun, Zhang Wansheng, Wang Quanjin
1999, 23(3): 231-236.
Abstract:
In this paper we present a timing pickup detector used at Radioactive Ion Beam Line in Lanzhou (RIBLL). It has low detection threshold and is radiation-resistant. The photons induced by radioactive beam ions passing through a thin plastic-scintillato...
RIBLL Beam Diagnostics
Guo Zhongyan, Zhan Wenlong, Sun Zhiyu, Xiao Guoqing, Jiang Shanhong, Li Jiaxing, Meng Xiangwei, Wang Jinchuan, Zhang Wansheng, Qin Lijun, Wang Quanjin
1999, 23(3): 237-243.
Abstract:
The design, structure and performances of RIB diagnostic devices for Radioactive Ion Beam Line in Lanzhou (RIBLL) are described. Several RIB diagnostic devices based on fiber are shown in greater detail. The devices have high detection efficiency, fa...
Measurement of the Transmission Efficiency of He-Jet Laser Time-of-Flight Mass Spectrometer
Cheng Hongxing, Pang Wenning, Shang Rencheng, Zhang Wei, Ta La, Xiao Yuan, Xu Sida, Zhao Zhizheng, Luo Yixiao
1999, 23(3): 244-249.
Abstract:
A He-jet laser bine-of-flight (TOF) mass spectrometer system is built. The sample atoms evaporated in the atomization chamber are used to simulate the reaction products. The sample atoms are transferred by helitim gas trough a thin capillary.After pa...
Contributions From PGBs in TOPCMTC Model to the Top-Quark Rare Decay
Lu Gongru, Pan Qunna, Huang Jinshu, Yue Chongxing
1999, 23(3): 250-259.
Abstract:
The decays t→cV(V= Z,γ, g) induced through loop processes are calculated in Topcolor-Assisted Multiscale Technicolor model. We find that the extended technicolor interactions provide the main contribution to these decays, and the total contribution c...
Infrared Divergences of Three-loop Vacuum Graghs of Quark Field at Hight Temperature
Chen Xiangjun, Zhang Weining, Wang Wei
1999, 23(3): 260-267.
Abstract:
The infrared divergences in vacuum graghs of quark (ignored mass) field at high tempethere are calculated in detial by real-time formulation of Green function, a kind of infrared divergent integral related to F-D statistical factor is pointed out and...
Charmonium Production and Absorption in P-A and A-A Collision
Yao Xiaoxia, Zhang Xiaofei, Qiao Congfeng, Zhao Weiqin
1999, 23(3): 268-280.
Abstract:
J/ψ and ψ′production cross sections in fixed-target experiment is calculated, considering the contributions from both color-singlet and color- octet mechanisms. The resultS are applied to the investigations of the J/ψ suppression and the ψ′/ψ ratio p...
Criterion of Identical Bands and Quantization of Incremental Alignments in Superdeformed Nuclei
Shen Caiwan, Luo Wendong, Chen Yongshou
1999, 23(3): 281-288.
Abstract:
A new method used to select identical bands is given from the energies.More than one hundred superdeformed bands were analysed by this method, and many identical bands were found. A concept of quantized region is used to analyse the quantization of i...
Nonlinear Spectrum-Generating Algebra for the Symmetrical Pöschl-Teller Potential
Ni Zhixiang
1999, 23(3): 289-297.
Abstract:
Using the Hamiltonian and the natural operators, we obtain a nonlinear spectrum-generating algebra for the symmetrical Pöschl-Teller Potential. This algebra gives a new method with obvious physical meaning to describe and solve the quantum motion in ...
Control System of RIBLL
Sun Zhiyu, Zhan Wenlong, Guo Zhongyan, Xiao Guoqing, Jiang Shanhong, Li Jiaxing, Wang Jinchuan, Meng Xiangwei, Zhang Wansheng, Qin Lijun, Wang Quanjin
1999, 23(3): 298-301.
Abstract:
This paper describes the working principle and structure of the control system of the Radioactive Ion Beam Line in Lanzhou (RIBLL).
Focusing Properties of Radio-Frequency Quadrupole Lenses
Yu Qingchang, Guo Weiming
1999, 23(3): 302-307.
Abstract:
In this paper the equations of motion for charged particles in radio-frequency quadrupole lenses are studied, the transfer matrix elements are derived and the relations between the focusing properties of the lenses and the lens parameters are discuss...
Beam Energy Correction in Synchrotrons
Zhang Chuang
1999, 23(3): 308-312.
Abstract:
The principle of beam energy measurement and its correction in synchrotrons are described. The formulas of beam energy correction for closed orbit distortion and dipole correctors are derived. The application of these formulas in the Beijing Electron...

ISSN 1674-1137 CN 11-5641/O4

Original research articles, Ietters and reviews Covering theory and experiments in the fieids of

  • Particle physics
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