2001 Vol. 25, No. 10

Display Method:          |     

Particle and field theory
Calculation of the 0++ Glueball Mass for 2+1 Dimensional QCD by Using the Improved Lattice Hamiltonian
JIANG Jun-Qin, LI Jie-Ming
2001, 25(10): 941-944.
Abstract:
Using the improved lattice Hamiltonian and the truncated eigenvalue equation method, we com- pute the 0++ glueball mass for (2+1)-dimensional QCD. The numerical result shows a good scaling be havior.
Top-Charm Production in the Topcolor-Assisted Technicolor Theory
YUE Chong-Xing, LI Jian-Tao
2001, 25(10): 945-951.
Abstract:
In the framework of topcolor-assisted technicolor (TC2) theory, we calculate the contri- butions of TC2 dynamics and the neutral top-pion to top-charm production at the high energy e+e linear collider (LC) experiments. Our results show that the cont...
Antiproton Spectrum Produced by Dark Matter Annihilation
SUN La-Zhen, LIU Yao-Yang, JIANG Xiang-Dong
2001, 25(10): 952-957.
Abstract:
The cross section of the process X-0X-0→gg is calculated in supersymmetry model of parti- cle physics. By means of the obtained cross section value, the estimate of source spectrum for anti- protons produced by neutralino X-0 annihilation is given. W...
Trace Formula and Periodic Orbits Quantization for Two-Dimensional Integrable System
SONG Jian-Jun, LI Xi-Guo
2001, 25(10): 958-963.
Abstract:
The general quantization condition for periodic orbits in a two-dimensional integrable sys- tem is presented via the Berry-Tabor trace formula. Using the quantization and a periodicity condi- tion of periodic orbits the semiclassical quantization con...
Antibunching Effect for the Eigenstate of the Higher Powers of the Annihilation Operator of Two-Parameter Deformed Harmonic Oscillator
WANG Zhong-Qing
2001, 25(10): 964-970.
Abstract:
The antibunching effect for the eigenstates of the k-th powers of the annihilation operator of two-parameter deformed harmonic oscillator (akqs,k≥3) is studied. Using the numerical method , we have studied the influences of the two parameter (qs) def...
Nuclear and ion Physics
Measurement of β+ Delay Proton Decay of 23Al
WANG Hong-Wei, JIN Gen-Ming, Wu He-Yu, ZHANG Bao-Guo, XIAO Zhi-Gang, DUAN Li-Min, WEI Zhi-Yong, LI Zu-Yu, LU Zhao-Hui, LIU Yong-Ying, CHEN Ke-Liang, HU Rong-Jiang, ZHU Hai-Dong, CEN Ling, WANG Su-Fang, LI Xiang-Qing, CHEN Tao, HUA Hui
2001, 25(10): 971-976.
Abstract:
The β+ delay proton decay spectrum has been measured with TOF-ΔE method and zero degree detectors at the radioactive ion beam line in Lanzhou. The half life of 23 Al was determined to be T1/2=(476±45)ms by using a time scaler cornbined with the preci...
High Spin States in the N=50 Nucleus 88Sr
LIU Zhong
2001, 25(10): 977-983.
Abstract:
Excited states of 88Sr have been produced in the fusion evaporation reaction between 82Se beam and 16O from a heavily oxidized Ba target and studied using the in-beam γspectroscopy tech- niques. Two high-spin level structures have been Observed and e...
Shape Change of 129Ce at High Spin States
LI Guang-Sheng, DAI Zheng-Yu, LIU Xiang-An, ZHANG Lan-Kuan, WEN Shu-Xian, WU Xiao-Guang, YUAN Guan-Jun, PENG Chao-Hua, WENG Pei-Kun, LI Sheng-Gang, YANG Chun-Xiang
2001, 25(10): 984-988.
Abstract:
High spin states of 129Ce were populated through the reaction 116Sn(16O,3n)129Ce at a beam energy of 73 MeV. Lifetimes of the excited states were measured using the Doppler shift atten-uation method. The transition quadrupole moments Qt were deduced ...
Nuclear Deformation Effect on the J/ψ Suppression
SA Ben-Hao, LU Zhong-Dao, SU Zong-Di
2001, 25(10): 989-993.
Abstract:
The nuclear deformation effect on the J/ψ suppression in U-U central collisions at 200A GeV/c is investigated based on the hadron and string cascade model, JPCIAE. We found that the J/ψ suppression is nearly decreased by a factor of two, if the major...
Study on γ-Ray Strength Functions and Energy Spectra in the Neutron Radiative Capture of 197Au
LIU Jian-Feng, ZHAO Wei-Juan, WANG Feng-Ge, SU Zong-Di
2001, 25(10): 994-1001.
Abstract:
The aim of this paper is to explain theoretically the abnormal protuberances near and after 5.5 MeV in the gamma spectra of the (n, γ) reactions for the nulei in the regions of 110≤A≤140 and 180≤A≤210.
Supposing that in the primary and cascade gamma d...
Distributions of Realative Momentum of Pion Pairs in Relativistic Heavy Ion Collisions
CHEN Xiao-Fan, CHEN Zhi-Lai, YANG Xue-Dong, LI Zhu-Peng
2001, 25(10): 1002-1005.
Abstract:
The distributions of the relative momentum of correlated and uncorrelated pion pairs are given. The relations between the parameters of elliptical and spherical pion sources are obained by using the distribution of the relative momentum of correlated...
On the Moment of Inertia and Surface Redshift of Neutron Star
LI Wen-Fei, ZHANG Feng-Shou, CHEN Lie-Wen
2001, 25(10): 1006-1011.
Abstract:
Using temperature, density and isospin dependent nuclear equation of state, we calculat- ed the moment of inertia and surface redshift of neutron star by resolving Tolman-Oppenheimer-Volkoff equation. It is found that the moment of inertia and surfac...
Detection Technology and Methods
Characteristics of the Transtion Curves of Showers and Discrimination of γ-Rays and Hadrons in Iron Emulsion Chambers
JI Xiao-Bin, FU Yu, XUE Liang, ZHANG Xue-Yao, LI Jie, LI Jin-Yu, ZHANG Nai-Jian, He Mao, REN Jing-Ru, LU Sui-Ling
2001, 25(10): 1012-1016.
Abstract:
The GEANT3 code, a general software for detector simulations widely used in the experi- ments of particle physics, is introduced to the Monte Carlo simulation of iron emulsion chambers. Some haracteristics of transition curves of cascade shower and t...
Accelerator
Accurate Computation on High Order Modes of Axial-symmetric Cavity with Vector Finite Element Method
WEI Shi, LIN Yu-Zheng
2001, 25(10): 1017-1021.
Abstract:
Eigenfrequencies of high order modes in the axial-symmetric cavities are computed with a vector finite element method. Mathematics models and physics theories are combined in a rational way, which avoids the spurious modes caused by ordinary finite e...
Effects of the Relativistic Electron Beam on the Phase Velocity of RF Field in Accelerator
PAN Wei-Min, LI Zhong-Quan, XIE Xi
2001, 25(10): 1022-1028.
Abstract:
The effects of the relativistic electron beam on the phase velocity of RF field in accelera-tor for small signal are studied. The idea of equating electron beam with medium is first developed and the formula of equivalent relative dielectric constant...
Production of Pulsed Ion Beams by ECR Ion Source Afterglow Mode
SONG Pei, GUO Xiao-Hong, ZHAO Hong-Wei, ZHANG Zi-Min, FENG Yu-Cheng, LI Jing-Yu, ZHANG Xue-Zhen
2001, 25(10): 1029-1034.
Abstract:
To satisfy the requirements of the Heavy Ion Cooling Storage Ring which is under con- struction at Lanzhou, afterglow mode was tested with the IMP 14 .5GHz ECR ion source to produce pulsed ion beams. The afterglow phenomenon was clearly observed and ...

ISSN 1674-1137 CN 11-5641/O4

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

  • Particle physics
  • Nuclear physics
  • Particle and nuclear astrophysics
  • Cosmology
Author benefits
News
Cover Story

Advertising

Advertising