2001 Vol. 25, No. 8

Particle and field theory
Initial State Radiative Correction in R Measurement at BES
HU Hai-Ming, QI Xiang-Rong, HUANG Guang-Shun, ZHAO Zheng-Guo
2001, 25(8): 701-709.
Abstract:
Three typical schemes of the initial state radiative correction in e+e collision through single photon annihilation were reviewed, and the numerical results were calculated in the energy region of 2—5GeV. The differences of the theoretical values of...
Hadron Multiplicities and Its Momentum Spectra from Color Separate Connection among Final Partons in e+e Annihilation Events
SHAO Feng-Lan, XIE Qu-Bing
2001, 25(8): 710-719.
Abstract:
We calculate the hadron multiplicities and the momentum spectra of π±,K±,p/p in e+e→q+ng→hadrons for the case where the color separate singlet connections occur among the final partons q+ng with the help of JETSET event generator. We compare the res...
Higher-Twist Effects on the Nucleon Spin Structure Functions in the Small Q2 Range
DONG Yu-Bing
2001, 25(8): 720-724.
Abstract:
Based on the quark model, the Q2 evolution of the nucleon spin structure functions in the small Q2 region is calculated. The higher-twist effects a2(Q2) and d2(Q2) are investigated. Comparison with other model calculations is also proceeded.
Nuclear and ion Physics
Level Structure in 209Fr
ZHOU Xiao-Hong, GUO Ying-Xiang, ZHU Shao-Fei, LEI Xiang-Guo, LIU Min-Liang, LIU Zhong, ZHANG Yu-Hu, HE Jian-Jun, ZHENG Yong, LUO Yi-Xiao
2001, 25(8): 725-730.
Abstract:
The high-spin states of 209Fr have been studied in the 197Au(16O,4n)209Fr reaction at 16O energies from 90 to 105 MeV using techniques of in-beam γ-ray spectroscopy. Measurements of γ-ray excitation functions,γ-γ-t coincidences and γ-ray angular dist...
Measurement of β+ Delayed α Decay of 20Na
WANG Hong-Wei, WU He-Yu, JIN Gen-Ming, 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(8): 731-735.
Abstract:
Through the 20Na β+ 20Ne→16O+α process,the half-life and β+ delayed α decay spectrum of 20Na have been measured on the Radioactive Ion Beam Line in Lanzhou(RIBLL). The 20Na was identified through TOF-ΔE method and alpha particle was measured by four ...
Quasiparticles Plus Rotor Model and the Analysisof Level Statistics of Odd-Odd Nucleus
CHENG Nan-Pu, ZHENG Ren-Rong, ZHU Shun-Quan
2001, 25(8): 736-742.
Abstract:
The energy levels of odd-odd nucleus 84Y at low spins were calculated by using the axially symmetric particles plus rotor model. In order to study the statistical properties of the energy levels, the two standard tests of Random-Matrix Theory such as...
Study about Light Hypernuclei and YN Interaction Based on Chiral SU(3) Quark Model
ZHANG Miao-Jing, SHEN Peng-Nian, LIU Xian-Hui, KONG Fan-Xin
2001, 25(8): 743-753.
Abstract:
In terms of the YN interaction based on the chiral SU(3) quark model,the spectra of light hypernuclei 4ΛH,4ΛHe and 5ΛHe are calculated. The result shows that the effective local ΛN potential,as an approximation,cannot offer a reasonable explanation o...
Odd-Even Difference of Moment of Inertia of NuclearSuperdeformed States in A~190 Region
GUO Jian-You, XU Fu-Xin, RUAN Tu-Nan
2001, 25(8): 754-758.
Abstract:
By fitting the E2 transition spectra of superdeformed bands in A~190 region, the coefficients of Bohr-Mottelson's I(I+1) expansion are determined and moments of inertia of band head are calculated out. All results show that the moments of inertia of ...
Density Dependence of Proton Fraction in Neutron Stars
LI Wen-Fei, 2< sup>, ZHANG Feng-Shou, CHEN Lie-Wen
2001, 25(8): 759-764.
Abstract:
Within the framework of Skyrme-Hartree-Fock theory based on the extended Skyrme effective interaction, the proton fraction in β-stable neutron stars was investigated for the charge neutrality condition. The density dependence of symmetry energy stren...
Entrance Channel Dependence of the Isospin Effects of the Nuclear Stopping in Intermediate Energy Heavy Ion Collisions
YANG Yan-Fang, LIU Jian-Ye, ZUO Wei, GUO Wen-Jun, ZHAO Qiang
2001, 25(8): 765-771.
Abstract:
The entrance channel dependence on the isospin effects of the nuclear stopping in intermediate energy heavy ion collisions was studied by using the isospin-dependent quantum molecular dynamics with three forms of the symmetry potential. It shows that...
Bremsstrahlung Radiative Correction in QED at Finite Temperature
XIAO Jun, WANG En-Ke
2001, 25(8): 772-779.
Abstract:
Based fully on the finite temperature field theory, we calculate the Feynman diagram to analyse the new infrared divergence caused by the temperature effect in the bremsstrahlung process. It turns out that both of the infrared divergence at the zero ...
Accelerator
Beam-Beam Study in Beijing Electron Positron Collider mini-β Scheme
WANG Sheng, FANG Shou-Xian, ZHANG Chuang
2001, 25(8): 780-786.
Abstract:
For performing mini-β scheme in the Beijing Electron-Positron Collider (BEPC),high RF voltage is supplied for shortening the bunch length,but results in the luminosity decrease. This is the special phenomenon of beam-beam on BEPC, which limits the pe...
Design of a New DC-RF Injector Used in High Average Power FEL
HU Yan-Le, ZHAO Kui, CHEN Jia-Er, ZHANG Bao-Cheng, HAO Jian-Kui, WANG Li-Fang
2001, 25(8): 787-792.
Abstract:
Here we give the design proposal of a new DC-RF injector used in high average power FEL. The injector includes a Pierce gun and a 1+1/2 SC cavity. It will be able to provide high average beam current because it can work in CW mode. By changing the sh...
Synchrotron radiation,applications of nuclear techniquees,etc
A Proton Beam Delivery System for Conformal Therapyand Intensity Modulated Therapy
YU Qing-Chang, KE Xue-Yao
2001, 25(8): 793-798.
Abstract:
A scattering proton beam delivery system for conformal therapy and intensity modulated therapy is described. The beam is laterally spread out by a dual-ring doublescattering system and collimated by a program-controlled multileaf collimator and patie...

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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