2005 Vol. 29, No. 5

Letter
Description of New Element Z=113 and Its α-Decay Chain
TAI Fei, CHEN Ding-Han, XU Chang, REN Zhong-Zhou
2005, 29(5): 439-441.
Abstract:
RIKEN has produced the new element Z=113 by cold-fusion reaction. Here we systematically study the new nuclide 278113 and its α-Decay chain using deformed relativistic mean-field theory with three sets of force parameters,TMA,NL-Z2 and NL3.The result...
Particle and field theory
Charmonium Formation and Suppression in Nuclear Matter
XU Jia-Jun, WANG Jia, ZHUANG Chao, ZHUANG Peng-Fei
2005, 29(5): 442-446.
Abstract:
The coupling Schrodinger equations describing the evolution of c`c states in nuclear matter are analytically and systematically solved via perturbation method,and the correlation between charmonium formation and nuclear absorption is investigated. Af...
Third Order Result of the 0++ Glueball Wave Function for U(1) Improved Lattice Gauge Theory in Three-Dimensions
JIANG Jun-Qin
2005, 29(5): 447-450.
Abstract:
Using the improved lattice gauge field Hamiltonian and the truncated eigenvalue equation method, we compute the 0++ glueball wave function of three-dimensional U(1) lattice gauge theory up to the 3rd order. The scaling behavior of the 3rd order resul...
Nuclear and ion Physics
Identification of the New Isotope 265107Bh by α Correlated Decay Chains
FAN Hong-Mei, WU Xiao-Lei, GUO Jun-Shen, GAN Zai-Guo, QIN Zhi, LEI Xiang-Guo, DONG Cheng-Fu, XU Hua-Gen, CHEN Ruo-Fu, ZHANG Fu-Ming, GUO Bin, LIU Hong-Ye, WANG Hua-Lei
2005, 29(5): 451-455.
Abstract:
The experimental set-up, methods and results on the synthesis and identification of the new isotope 265 107Bh are presented in this paper. The new isotope was produced by the complete fusion-evaporation reaction of 243Am with 168MeV 26Mg at the Secto...
Isospin Effect of Momentum Dependent Interaction in Heavy Ion Collisions
LIU Jian-Ye, GUO Wen-Jun, Xing Yong-Zhong, LI Xi-Guo
2005, 29(5): 456-460.
Abstract:
We insert the isospin degree of freedom into the momentum dependent interaction to obtain an isospin and momentum dependent interaction given in a form practically usable in isospin dependent quantum molecular dynamics model. We investigate the isosp...
Particle (pseudo) Rapidity Distribution and the Overlapping Cylinder Model in Nucleus-Nucleus Collisions at High Energies
SONG Fu, LIU Fu-Hu
2005, 29(5): 461-466.
Abstract:
The overlapping cylinder model (OCM) is used in this letter to describe the rapidity (or pseudorapidity) distributions of charged particles produced in nucleus-nucleus collisions at high energies. For the fixed target experiments at present accelerat...
Pion Interferometry for Cylindrical Quark-Gluon Plasma Evolution Sources
Efaaf M.J., ZHANG Wei-Ning, Khaliliasr M., HUO Lei, JIN En-Pei, ZHANG Jing-Bo
2005, 29(5): 467-471.
Abstract:
We examine the two-pion Hanbury-Brown-Twiss (HBT) interferometry for the expanding sources of quark-gluon plasma evolution with the Bjorken cylinder geometry.The two-pion HBT correlation functions are calculated using quantum probability amplitudes i...
Chemical Potential of Resonance Matter and Particle Density, Energy Density
HU Shou-Yang, FU Yuan-Yong, LU Zhong-Dao
2005, 29(5): 472-475.
Abstract:
The statistical property is studied for the resonance matter produced in relativistic heavy-ion collision. The relation between chemical potential of the resonant particle and net particle density is discussed. The total particle density and the ener...
Detection Technology and Methods
Design and Optimization of Cell Structure and Layer Arrangement of BESⅢ Drift Chamber
WU Ling-Hui, LIU Jian-Bei, CHEN Yuan-Bai, WANG Yi-Fang, CHEN Chang, ZHU Qi-Ming, LIU Rong-Guang, MA Xiao-Yan, TANG Xiao, JIN Yan, WANG Lan, ZHANG Bing-Xin, QIN Zhon
2005, 29(5): 476-480.
Abstract:
Design of cell structure and layer arrangement of the BESⅢ drift chamber are presented. The effect of stereo angles and the layers at axial-stereo boundaries on the drift-time-to-distance relation are discussed. In addition, the optimization of layer...
The Experimental Study of the Gas Gain of He/C3H8(60/40)
MA Yuan-Yuan, LIU Jian-Bei, CHEN Chang, CHEN Yuan-Bai, JIN Yan, LIU Rong-Guang, MA Xiao-Yan, TANG Xiao, WANG Lan, XU Mei-Hang, ZHU Min-Xuan, ZHU Qi-Ming
2005, 29(5): 481-484.
Abstract:
Using a proportional tube, the gas gain of the helium-based gas mixture He/C3H8(60/40) was measured with 55Fe 5.9keV X-ray source as a function of the anode wire high voltage, gas temperature, gas pressure and gas mixture ratio. The gas mixtures of H...
Identification of Primary γ-Rays in ARGO Experiment at Yangbajing Using ANNS
MA Li-Na, FENG Cun-Feng, ZHANG Yao, ZHANG Xue-Rao
2005, 29(5): 485-490.
Abstract:
The lateral distributions, as measured by ARGO array, of the extensive air showers induced by γ and hadrons with energy range from 100GeV to 10 TeV, zenith angle from 0° to 45°, were studied using Monte Carlo generated data. Several parameters such a...
Accelerator
Research of Reproducibility of Dipoles for Cooler-Storage-Ring
SU Ya-Long, HE Yuang, HAN Shao-Fei, YUANG Ping, LIU Wei-Jun, MA Li-Zhen, ZHANG Si-Ling, WANG Wen-Jin
2005, 29(5): 491-494.
Abstract:
The measurement method and principle of dipole magnet reproducibility for Cooling-storage-ring are introduced. How the position and number of steel sheet affect the reproducibility of magnet is investigated. In the end, the reproducibility of CSRm di...
TESLA TW Positron Injector Linac and Beam Modeling
WANG Shu-Hong, JIN Kai, ZHOU Feng
2005, 29(5): 495-500.
Abstract:
The TESLA positron injector linac with an L-band TW normal conducting structure has been studied, which offers both higher shunt impedance and larger aperture. Main parameters of this injector linac have been designed by systematical beam modeling, a...
Study On Character of Backstreaming Ions Source
LONG Ji-Dong, SHI Jin-Shui, YU Hai-Jun, LIN Yu-Zheng
2005, 29(5): 501-506.
Abstract:
Plasma could be produced when intense electron beams striking on converter target materials, such as Ta. The beam space charge may draw an ion current out of the plasma, which could substantially affect the final focus of beam on the target. This is ...
Study on BEPC Experimental Electron Gun System
LIU Bo, GU Meng-Ping, CHi-Yun-Long, YANG Xing-Wang, TIAN Shuang-Min
2005, 29(5): 507-511.
Abstract:
E5-4 experimental electron gun system is the improved version of BEPC gun system. Firstly,some theoretical analyses on E5-4 gun are performed.Beam testing result is then introduced. The test is based on Y796 cathode-grid assembly, new power supply sy...
The Simulation and Experiment Study of a 4 Rod RFQ RF Property
ZHU Kun, GUO Zhi-Yu, FANG Jia-Xun, GAO Shu-Li, SONG Xiang-Xiang
2005, 29(5): 512-516.
Abstract:
A 4-rod RFQ cavity was simulated with MAFIA code for the design of a high current, high duty factor RFQ accelerator. The influence of distance, wide, height and shape of stems on the cavity's RF property were studied. The structure parameters of the ...
Synchrotron radiation,applications of nuclear techniquees,etc
Analysis and Calculation on Electron Bunch Length Measurementby Using CDR
LIU Ai-Qin, LOU Zheng-Ping, CHEN You-Zhong, ZHOU Wei-Min, Dai Zhi-Min
2005, 29(5): 517-523.
Abstract:
Measurement of electron bunch length through its generated coherent diffraction radiation (CDR) via optical autocorrelation is a new non-intercepting frequency domain diagnostics technique developed in accelerator fields recently. In this paper, the ...
Effects of Hydrogen Plasma Treatment on Cavity Formation in Silicon Induced by He Ion Implantation
LIU Chang-Long
2005, 29(5): 524-529.
Abstract:
The effects of hydrogen plasma treatment on He-implantation-induced cavities in silicon during subsequent annealing were studied.Silicon samples were first implanted at room temperature with He ions of different energies (40,160 and 1550keV) at the s...
The Relation the Incident Angle of High Energy Primary Electron of Metal and Real Efficient Secondary Electron Emission Coefficient
XIE Ai-Gen, PEI Yuan-Ji, WANG Rong, SUN Hong-Bing
2005, 29(5): 530-532.
Abstract:
This paper derived the formulation of the real efficient emission coefficient secondary electron under the condition that high energy primary electron incident on metal obliquely .It shows that the coefficient is reversely proportional to the cosine ...