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2005 Vol. 29, No. 4

Particle and field theory
Search for Exotic States at BESⅢ
MA Xu-Bo, FANG Shuang-Shi, ZHU Yu-Can, LU GoNG-Ru, YANG Hong-Xun
2005, 29(4): 329-336.
Abstract:
A general introduction to the theoretical predictions for the mass,width and decay modes of exotic states is briefly described. the current status of experiment searches for the candidates of exotic states and their inconsistences with theoretical pr...
On the Structure of Reggeon
PENG Hong-An, HE Zhen-Min, GAO Yong-Hua, YAN Zhan-Yuan, DUANG Chun-Gui
2005, 29(4): 337-344.
Abstract:
Starting from the point-view that the constituent quark has its own inner structure and according to the hypothesis of the maximum non-perturbative strong interaction reaction which should be obeyed in high energy strong-soft Processes ,we proposed a...
Higher Order RPA Calculation of the Glueball Wave Function in 2+1-D SU(2) LGT
HUI Ping
2005, 29(4): 345-349.
Abstract:
By Solving Shrodinger equation with the RPA coupled cluster method, The higher order glueball wave function in 2+1-D SU(2) lattice gauge theory is calculated. In the calculation, hollow Wilson graphs are selected as the trial wave function, and speci...
Calculation and Generalization of Non-Adiabatic Geometric Phase of Isotonic Oscillator with Operator Decomposition
An Nan, YANG Xin-E
2005, 29(4): 350-353.
Abstract:
Operator decomposition approach is used to calculate the non-adiabatic geometric phase of anharmonic oscillator. As an example we focus on isotonic oscillator, a type of anharmonic oscillator. The Aharonov-Anandan phase is derived when we choose base...
Nuclear and ion Physics
Effect of Pairing Correlation on the Ground State and Collective Excitations of Nucleus
CAO Li-Gang, MA Zhong-Yu
2005, 29(4): 354-360.
Abstract:
The contribution of the resonant continuum to pairing correlations is properly treated in the RMF+BCS approximation with a constant pairing strength. The results show that the contribution of the proper treatment of the resonant continuum to pairing ...
A Study of the Charm-Baryonic Structure from ㄚ Decays
PING Rong-Gang, ZOU Bing-Song
2005, 29(4): 361-365.
Abstract:
In the framework of perturbative QCD,the exclusive decays ΥBˉB(B:baryon) are studied.With the constituent quark model describing the charm-baryonic structure, we calculate the decay widths for $\Upsilon\to p\bar p,\Lambda_c\bar \Lamb...
Study on Stiffness of the Symmetry Energy at High Densities by π+ Ratio
YONG Gao-Chan, Bao An Li, ZUO Wei
2005, 29(4): 366-370.
Abstract:
using the isospin–and momentum–dependent transport model, for three different symmetry energies, we have calculated the π+ ratio as a function of time and tranverse–momentum in central 132sn+124 sn collision at e_beam/A=400mev. the results show th...
Study on the Feature of Longitudinal Collective Flow Distribution and Nuclear Stopping at RHIC
YUAN Xian-Bao, FENG Sheng-Qin
2005, 29(4): 371-375.
Abstract:
The net–proton distribution features at rhic have been analyzed by using non–uniform flow model in this paper. it is found that the system produced at the rhic energy region has stronger non–uniform feature than at the ags and sPs energy regions, whi...
Detection Technology and Methods
Physical Design of Main Drift Chamber Trigger for BESⅢ Experiment
XU Hao, LIU Zhen-An, JIN Da-Peng, WANG Da-Yong, ZHAO Di-Xin, GUO Ya-Nan
2005, 29(4): 376-382.
Abstract:
this article describes the design and simulation of the scheme of main drift chamber (mdc) trigger for besⅢ (beijing spectrometer Ⅲ). the algorithm of mdc trigger includes 3 steps: track segments finding (tsf), track finding (tf) and trigger conditio...
Development of Si Multi-Strip Detector
TAN Ji-Lian, JIN Gen-Ming, WANG Hong-Wei, DUAN Li-Min, YUAN Xiao-Hua, WANG Xiao-Bing, LI Song-Lin, LU Zi-Wei, XU Hu-Shan, NING Bao-Jun, TIAN Da-Yu, WANG Wei, ZHANG Lu
2005, 29(4): 383-386.
Abstract:
the technics and test results and preliminary applications of si multi–strip detector fabricated by using microelectronic technique were described in this paper. the sensitive area of this kind of detector is 50mm×20mm. the P side surface was divided...
Experimental Study of a Small-Cell drift Chamber Operated with Helium-Based Gases
LIU Jian-Bei, CHEN Chang, CHEN Yuan-Bai, JIN Yan, LIU Rong-Guang, MA Xiao-Yan, MA Yuan-Yuan, QIN Zhong-Hua, TANG Xiao, WANG Lan, WU Ling-Hui, XU Mei-Hang, ZHU Min
2005, 29(4): 387-392.
Abstract:
The performance of a small–cell drift chamber operated with two helium–based gas mixtures, he/c_3h_8(60/40) and he/ch_4(60/40), was studied using cosmic rays, respectively. the gas mixture ar/co_2/ch_4(89/10/1) was also tested for comparison. the spa...
Time Performance Study on Precision Drift Tube at High Pressure
OU Yang-Qun, ZHUANG Xu-Ai, XIE Yi-Gang, ZHENG Shu-Chen, CHI Shao-Peng, XIE Song, HAN Hong-Guang, CHENG Shao-Chen, YANG Yi
2005, 29(4): 393-398.
Abstract:
In this paper the time performance of the precision drift tube at high pressure has been studied. the time spectrum of the drift electrons and the (r–t) relationship between the distance from the charged particle track to the anode wire and the drift...
Thin Plastic Scintillating Foil for Measuring Pulsed Neutron Flux in High Gamma-Ray Environment
OUYANG Xiao-Ping, LI Zhen-Fu, WANG Qiu-Shu, HUO Yu-Kun
2005, 29(4): 399-403.
Abstract:
A new conception of measuring pulsed neutron flux in high gamma–ray environment with a thin plastic scintillating foil is presented. based on the calculations of the response to neutrons and gamma–rays, a new gamma–insensitive detector for detecting ...
Accelerator
Development of the BEPCⅡ Positron Source Flux Concentrator
LIU Jin-Tong, GEN Zhe-Qiao, SUN Xian-Jing, SUN Yao-Lin, PEI Guo-Xi
2005, 29(4): 404-407.
Abstract:
The flux concentrator is a matching device for the positron beam, which matches the transverse emittance between the target and successive accelerator tubes. it is one of the most important parts of the bePcⅡ positron source and for improving the pos...
2-D Beam Profile Measurement Based on CT Algorithm with Rotating Multi-Wire Target
YU Neng-Jie, TANG Chuan-Xiang, ZHENG Shu-Xin, LI Quan-Feng, GONG Ke
2005, 29(4): 408-412.
Abstract:
A new method for the 2–d low energy electron beam profile measurement is developed. based on the ct(computer tomography) algorithm, multi sets of data about the 1–d beam profile projections are attained by rotating the multi–wire target. then a 2–d b...
Lorentz Force Detuning Analysis of 700MHz Single-Cell Superconducting Cavity
GE Ming-Qi, ZHAO Sheng-Chu
2005, 29(4): 413-417.
Abstract:
In this paper, the lorentz force detuning of superconducting cavity is illustrated and discussed in detail. the static lorentz force detuning and dynamic lorentz force detuning of a 704mhz/β=0.45 single–cell superconducting cavity is calculated with ...
Coupling Compensation Scheme in BEPCⅡ
YU Cheng-Hui, WU Ying-Zhi, XU Gang
2005, 29(4): 418-423.
Abstract:
A new idea to compensate the coupling of bePcⅡ will be introduced in this paper. the detector solenoid field in the interaction region will be compensated by six anti–solenoids which are located nearby the interaction point. skew quadrupoles are adop...
Application of Data Mining in Beam Status Descriptive Modeling
XIE Dong, LI Wei-Min, XUAN Ke, HE Duo-Hui
2005, 29(4): 424-429.
Abstract:
cluster analysis is an effective method for describing colony character. hower, as the size of mined databases increased ,it is a complex problem in searching for the extremum of score function. in this paper, we propose a novel technique and apply i...
Synchrotron radiation,applications of nuclear techniquees,etc
VUV/EUV Primary Standard Detector Facility and Transfer Detector Calibration
ZHENG Lei, CUI Ming-Qi, ZHAO Yi-Dong, ZHU Jie, ZHOU Ke-Jin, CHEN Kai, ZHAO Jia, SUN Li-Juan, MA Chen-Yan, ZHOU Hong-Jun, HUO Tong-Lin
2005, 29(4): 430-434.
Abstract:
A transfer standard detector was calibrated for the fist time with respect to the vuv/euv primary standard detector built at the metrology beamline in national synchrotron radiation laboratory (nsrl) at wavelength 17.625nm, 6.8nm and 92nm. the repeti...
Evolution of Field Entropy in the Multiphoton Jaynes-Gummings Model
LU Dao-Ming
2005, 29(4): 435-438.
Abstract:
In this paper, the dynamical properties of the field entropy in the multiphoton jaynes–cummings model are studied. it is showed that the evolution of field entropy has no periodicity and is influenced by the initial states of atoms and the initial ph...

ISSN 1674-1137 CN 11-5641/O4

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

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