2005 Vol. 29, No. 1

Letter
Identification of High-Spin States in Odd-Odd 126I
LI Rong-Jun, MA Ying-Jun, WU Xiao-Guang, ZHANG Yu-Hu, ZHU Li-Hua, WANG Shou-Yu, LI Ming-Fei, LIANG Guo-Dong, CUI Xing-Zhu, LI Xian-Feng, ZHAO Guang-Yi, LU Jing-Bin
2005, 29(1): 1-4.
Abstract:
Excited states in odd–odd 126I have been studied via the heavy–ion induced fusion–evaporation reaction 122Sn(11B,5n2p) at beam energies of 55 and 60 MeV with beams provided by the HI–13 tandem accelerator of CIAE in Beijing.A level scheme consisting ...
Particle and field theory
Cabbibo Suppressed Semileptonic Decay D0→π-e+ve
Medina Ablikim, CHEN Jiang-Chuan, RONG Gang, ZHANG Da-Hua
2005, 29(1): 5-8.
Abstract:
The transition rate for the Cabibbo suppressed decay d0→π–e+ν e is calculated. This allows the extractions of the form factor |fπ +(0)| and the CKM matrix element |v cd| using the measured branching ratio.
Contribution of Sigma Meson Cloud to Proton's Antiquark Distribution
HUANG Feng, XU Rong-Guang, MA Bo-Qiang
2005, 29(1): 9-13.
Abstract:
The lightest meson π in meson cloud model gave a natural explanation for the observed large light flavor sea asymmetry in proton,but not a satisfied explanation for (x)/(x). here we take into account the σ meson cloud effect,which gives a better desc...
Breakdown of Entanglement During the Teleportation
WANG Jin-Feng, WANG Yu-Ming, LI Xue-Qian
2005, 29(1): 14-18.
Abstract:
The teleportation may become an important means for remote distance communications in the future,and the mechanism is based on entanglement of quantum states.but the entanglement is fragile.As the state is disturbed by the environment the entanglemen...
The Study on Generalized Toda Mechanics System with Loop Algebra L(Dr)
ZHU Qiao, YANG Zhan-Ying, SHI Kang-Ji
2005, 29(1): 19-22.
Abstract:
In this paper,we generalize the Toda mechanics system with long range interaction to the case of Loop algebra l(Dr).by using a pair of ordered positive integer (X,y) to describe Toda chains,we extract the equation of motion and the hamiltonian struct...
Nuclear and ion Physics
Further Research on Level Structures of Neutron-Rich Odd-A Ru Nuclei
ZHU Sheng-Jiang, ZHANG Zheng, XIAO Shu-Dong, CHE Xing-Lai, U Yong-Nan, LI Ming-Liang, ZHENG Ran-Cheng
2005, 29(1): 23-27.
Abstract:
Through analyzing the data with high statistics from measuring high–fold prompt γ–ray coincidence events following the spontaneous fission of 252Cf with the Gammasphere detector array,the level schemes in neutron–rich odd–A 109,111Ru nuclei have been...
Measurement of Total Reaction Cross Section of the Proton Drip-line Nucleus 17Ne on Si Target
LI Jia-Xing, LI Chen, GUO Zhong-Yan, XIAO Guo-Qing, ZHAN Wenlong, WANG Jian-Song, SUN Zhi-Yu, WANG Meng, CHEN Li-Xin, MAO Rui-Shi, HU Zheng-Guo
2005, 29(1): 28-31.
Abstract:
20Ne was used as primary beam to bombard Be target to produce RIB 17Ne, which is a candidate of proton halo nuclei in theoretical prediction.The total reaction cross section of 17Ne on Si target was measured.No enhancement was observed compared with ...
Theoretical Study of Superdeformed Triaxial States in 164Lu
WANG Xiao-Ming, YU Shao-Ying, SHEN Cai-Wan, CHEN Yong-Shou
2005, 29(1): 32-35.
Abstract:
The triaxial superdeformed band in nucleus 164Lu are identified by three dimensional self–consistent TRS calculation.The calculated results agree with the data.The configuration of the triaxial superdeformed band is assigned as (π[660]1/2,α=1/2)(ν[64...
The Effects of the Pion String at Heavy ion Collisions
MAO Hong, LI Yun-De
2005, 29(1): 36-40.
Abstract:
We study the possible signals of the pion string associated with the QCD chiral phase transition in LHC Pb–Pb collision at energy s=5.5 TeV.We follow the Kibble–Zurek mechanism to discuss the production and evolution of the pion string.We will show t...
Nuclear Fusion near Coulomb Barrier
FENG Zhao-Qing, ZHANG Feng-Shou, LI Wen-Fei, JIN Gen-Ming
2005, 29(1): 41-45.
Abstract:
By using an improved isospin dependent quantum molecular dynamics model, the fusion reaction near coulomb barrier is studied for the 16O+16O system.The surface energy of the system is improved by a switch function method,which combines the surface en...
Pion Interferometry for Spherical Quark-Gluon Plasma Evolution Sources
Efaaf M, ZHANG Wei-Ning, Khaliliasr M, JIN En-Pei, LIU Yi-Ming
2005, 29(1): 46-49.
Abstract:
We examine the two–pion interferometry for the expanding sources of spherical quark–gluon plasma evolution. The quark–gluon plasma evolution is described by relativistic hydrodynamics with the equation of state of entropy density.The two–pion Hanbury...
Detection Technology and Methods
Measurement of the Performance of TGC Detectors
FENG Cun-Feng, YAN Zhen, ZHU Cheng-Guang, WANG Suo-Jie, LU Tai-Guo, SUN Yan-Sheng, HE Mao
2005, 29(1): 50-54.
Abstract:
Shandong University is in charge of the research and production of T9 type TGC (Thin Gap Chamber)detectors for ATLAS experiment.in this paper,the stability and the leak current of the detectors working at 3200V voltage were measured, and the plateau ...
Design and Performance Measurement of the 1GeV/c Multiparticle Magnetic Spectrometer in the BEPC-LINAC Test Beam
LI Jia-Cai, ZHANG Liang-Sheng, HU Chun-Liang, WU Yuan-Ming, CUI Xiang-Zong, LIU Zheng-Quan, ZHANG Shao-Ping, ZHOU Bao-Qing, ZHENG Lin-Sheng
2005, 29(1): 55-61.
Abstract:
The 2Q2D magnetic spectrometer operating at the BEPC-Linac test beam site consists of 2 quadrupole magnets,2 dipoles and 2 position sensitive detectors.The spectrometer has a maximum acceptance of solid angle 5×10-4sr,a momentum range 0.2—1.3gev/c.Be...
Study on the Sensitivity in Detecting Crab Nebula by ARGO-YBJ Experiment
CUI Shu-Wang, HU Hong-Bo, WANG Huan-Yu, LU Hong, TAN Yong-Heng
2005, 29(1): 62-67.
Abstract:
A“full coverage”air shower array,ARGO (Astrophysical Radiation with Groundbased Observatory) experiment is under construction currently at YangBaJing in Tibet,China.Its altitude of 4,300m above see level is equivalent to an atmospheric depth of 606g/...
A Prototype of X-Ray Imaging Based on the GEM Detector
LI Cheng, SUN Yong-Jie, ZHOU Yi, AN Shao-Hui, XU Zi-Zong
2005, 29(1): 68-71.
Abstract:
A prototype of X-ray imaging device based on triple Gas Electron Multiply detector is studied,which has an effective gain up to 105 and can be used in high rate X-rays imaging.The precise method of micro–strip readout is designed for X-rays localizat...
Theoretical Calculation of the Design of Large Area Neutron Detector Array at RIBLL
CHEN Zhi-Qiang, YE Yan-Lin, WANG Jin-Chuan, XIAO Guo-Qing, ZHAN Wen-Long, XU Hu-Shan, GUO Zhong-Yan, JIANG Dong-Xing, WANG Quan-Jin, ZHENG Tao, ZHANG Gao-Long, LI Zhi-Huan
2005, 29(1): 72-76.
Abstract:
The design of large area neutron array detector at RIBLL for the study of neutron–rich nuclei is presented. The neutron detection efficiency, timing resolution and position distribution of this detecting system have been obtained by detailed Monte Ca...
Accelerator
Design of a β=0.45, f=350 MHz Spoke Cavity
ZHU Feng, QUAN Sheng-Wen, WANG Li-Fang, ZHAO Kui, CHEN Jia-Rong
2005, 29(1): 77-80.
Abstract:
Recently intensive studies have been done on superconducting cavities (e.g. spoke cavity, reentrant cavity, and ch cavity), which are used as accelerating structures in the low and medium energy part of high power high intensity proton or ion acceler...
RF Power Test and Conditioning of the New Accelerating Structures for the BEPCII-Linac
HOU Mi, ZHOU Zu-Sheng
2005, 29(1): 81-85.
Abstract:
The beijing electron Positron collider upgrade Project (bePcⅡ) requires its injector linac to upgrade the beam energy and current. thus the accelerating structures in the positron production region must be newly designed and constructed to meet the h...
A Real-time System For Measuring Spot Size of High Energy Accelerator Using Thick Pinhole Imaging
WU Gang, LI Quan-Feng, CHENG Cheng, DU Tai-Bin, HEI Dong-Wei, LUO Jian-Hui
2005, 29(1): 86-90.
Abstract:
In order to easily measure the beam spot size of high energy electron accelerators with internal target enclosed,a real–time system, based on thick pinhole imaging technique, is employed. The experimental result on a 15MeV electron linear accelerator...
Numerical Simulation and Analysis of SSC RF Cavity
LI Zhi-Hui, ZHENG Qi-Wen, GAO Yi-Hai, ZHANG Sheng-Hu, WU Jian-Qiang, WEN Ming, YU Qi
2005, 29(1): 91-94.
Abstract:
It is important for hirfl to improve the whole operation level if SSC accelerating voltage can be increased. In order to increase the voltage, it should firstly analyze the maximum voltage that SSC RF cavity can achieve in theory. SSC RF cavity was t...
The Numerical Algorithm of Secondary Emission Microwave Electron Gun
SUN Hong-Bing, PEI Yuan-Ji, XIE Ai-Gen, WANG Rong
2005, 29(1): 95-98.
Abstract:
a tracking algorithm using grid–based space charge fields is studied for the analysis of secondary emission microwave electron gun(semeg). the poisson equations of the space charge forces are determined in the bunchs rest frame with a multi–grid met...
Synchrotron radiation,applications of nuclear techniquees,etc
Experimental Investigations on the Resonator Mirrors of SR-FEL and ICF KrF Laser
GAO Huai-Lin, WANG Nai-Yan, SHAN Yu-Sheng
2005, 29(1): 99-103.
Abstract:
For storage–ring free electron laser (SR-FEL) and KrF laser driver of inertial confinement fusion(ICK KrF Laser), the mechanism of laser production is fully different from each other, but they have a nearly same requirement to the resonator mirror. T...

ISSN 1674-1137 CN 11-5641/O4

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