1989 Vol. 13, No. 6

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Review
ANALYSIS DEPTH PROFILING IN MATERALS BY ELASTIC RECOIL DETECTION
LIU Shi-Jie, WU Yue, SHENG Kang-Long, LI Chun-Ying
1989, 13(6): 481-486.
Abstract:
The elastic recoil detection (ERD) by using a 2.0—2.5MeV 4He ,ion beam has been employed to detect the depth profiling of hydrogen in the Silicon oxide and silicon nitride films.The correlation between the hydrogen content and the deposition conditio...
THE ANGULAR DISTRIBUTION OF PHOTONS IN ORTHOPOS-ITRONIUM THREE PHOTON DECAY
YANG Bao-Zhong, TAN Yong, TANG Xiao-Wei, BIAN Zu-He
1989, 13(6): 487-489.
Abstract:
The three photon decay of positronium was further studied using positronium source composed of 22Na and silica aerogel and triple fast coincidence method.We measured the angular distribution of the photons in the large angle region under symmetrical ...
NUMERICAL CALCULATION FOR ELECTROSTATIC DECELERATING LENS ENERGY ANALYZER
HU Yu-Min, LI Yi
1989, 13(6): 490-493.
Abstract:
The potential distribution in the electrostatic decelerating lens is calculated with charge-density method.The Gill method is used to simulate the electron orbits.The resolution of the analyzer is 1.0eV at 20keV.The influence of the beam diameter,inj...
THE QCD PREDICTIONS FOR THE GLUON DISTRIBUTION FUNCTION IN HADRONS
WU Ji-Min, SHEN Qi-Xing, SONG Xiao-Tong, ZHANG Hong-Xian, DU Jian-Guo
1989, 13(6): 494-502.
Abstract:
Using the Mellin transformation,we get the analytical series expression for the gluon distribution function from Altarelli-Parisi equation.This series converges rapidly.The behaviour of the gluon distribution function is also discussed from this expr...
ON GEOMETRIC QUANTIZATION FOR BOSONIC STRING (Ⅱ)
YU Yue, GUO Han-Ying
1989, 13(6): 503-511.
Abstract:
The Hilbert space and the representation of the generators of Virasoro algebra for bosonic string under a holomorphic polarization are given in this paper,It is shown that the contre term of Virasoro algebra may be interpreted as curvature of a holom...
THE WILSON LOOP EXPECTATION VALUES IN 2-AND 3-DIMENSIONAL su(2) LGT
LI Zhi-Bing, ZHENG Wei-Hong, GUO Shuo-Hong
1989, 13(6): 512-517.
Abstract:
An improved Monte Carlo scheme is applied to the computation of the expectation values of nxm Wilson loops in both 2-and 3-dimensional SU(2) lattice gauge theories.The results are compared with those simulated by the discrete group Y120 and the exact...
RAPIDITY DISTRIBUTION AND BARYON-ANTIBARYON CORRELATIONS IN e+e→TWO JET EVENTS
FANG Hai-Ping, XIE Qu-Bing, LAI Xiao-Ping
1989, 13(6): 518-525.
Abstract:
We extend our model by introducing explicitly the energy-momentum of quarks.By using the Monte-Carlo method,the rapidity distribution in light jet events is calculated.Agreement with experiment data is good.The baryon-antibaryon correlations in rapid...
THE STUDY OF TOPOLOGICAL TERMS OF THE NONLINEAR SIGMA MODEL
GAO Xiao-Chun, WANG Yong, XU Jing-Bo, LI Wen-Zhu
1989, 13(6): 526-529.
Abstract:
The canonical system of O(3) nonlinear sigma model in 1+1 dimensions is studied in this paper.It is shown that the topological term in the model will disappear under a suitable canonical transformation for the system.The significance of this result i...
THE EFFECTIVE TWO-MESON-EXCHANGE POTENTIAL DERIVED FROM THE QUARK-ANTIQUARK PAIR CREATION MODEL
YU You-Wen, SHEN Peng-Nian
1989, 13(6): 530-534.
Abstract:
The effective two-meson-exchange potential with regard to the box diagram in the N-N interaction has been derived by virtue of the one-gluon-exchange quark-antiquark pair creation model.The result shows that the general feature of this effective pote...
THE QUARK DEGREES OF FREEDOM IN HIGH ENERGY COMPOSITE PARTICLE SCATTERING
HUANG Chao-Hui, WANG De-An, MA Wei-Xing
1989, 13(6): 535-538.
Abstract:
We propose a hybrid quark hadron model to describe high energy composite particle scattering.The parameters for quark sector in the model are determined by fitting pp scattering data.We apply the model without any free parameter to proton-alpha elast...
SPIN OBSERVABLE IN ANTIPROTON-NUCLEUS ELASTIC SCATTERINGS
LI Yang-Guo
1989, 13(6): 539-543.
Abstract:
Elastic antiproton-nucleus scattering is analysed by a phenomenological optical model potential with spin orbit interaction.The elastic scattering differential cross section dσ/dΩ,polarization P(θ) and spin rotation function Q(θ) can be discribed by ...
SELFCONSISTENT SEMICLASSICAL CALCULATION WITH EXTENDED SKYRME FORCES AND THE PROPERTIES OF ISOVECTOR GIANT RESONANCES
LI Guo-Qiang, XU Gong-Ou
1989, 13(6): 544-552.
Abstract:
The properties of isovector giant resonances are discussed with the help of the nuclear ground state density profiles obtained from self consiotent semi-classical calculation.Both the component with ΔT3=0 and the components with ΔT3=±1 are considered...
THE NEUTRON EXCESS DEPENDENCE OF TOTAL REACTION CROSS SECTION IN THE INTERMEDIATE ENERGY DOMAIN
WANG Bing, SHEN Wen-Qing, FENG Jun, ZHU Yong-Tai, FENG En-Pu
1989, 13(6): 553-559.
Abstract:
A modified microscopic model for calculating the total reaction cross section in the intermediate energy domain is given,the effects of neutron skin,ground state deformation and surface diffusion of the nuclear matter distribution is discussed quanti...
ANALYSING PHOTONUCLEAR REACTION CROSS SECTIONS OF GIANT DIPOLE RESONANCES BY USING EXTENDED EXCITON MODEL BEING TREATED APPROXIMATELY
CAO Wen-Qiang, WANG Shun-Jin
1989, 13(6): 560-568.
Abstract:
The photonuclear reaction cross sections of giant dipole resonances for 208Pb,186W,181Ta,175Lu,75As and 55Mn are calculated by using the extended exciton model in a further approximation.They are in good agreement with experimental data.The theoretic...
ROTATIONAL EFFECT ON ELECTROMAGNETIC TRANSITIONS IN NUCLEI
XING Zheng, CHEN Xing-Qu
1989, 13(6): 569-573.
Abstract:
The signature-splitting of the energies,B(M1)-values and dynamical quadrupole moments in 159Tm are investigated by means of the extended particle-rotor model.In particular,the effect of second-order Coriolis interaction on the signature-dependence of...
THE ι-E PUZZLE AND THE GENERALIZED MOMENT ANALYSIS
YU Hong
1989, 13(6): 574-576.
Abstract:
We have introduced the photon angular distribution for moments of the process e+e→J/ψ→γB,B→P1P2P3 to discuss the ι-E puzzle and got an effective criterion to distinguish whether there exist E(1++) component in the peak for the process e+e→J/ψ→γKKπ.

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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