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《中国物理C》(英文)编辑部
2024年10月30日

1986 Vol. 10, No. 3

Display Method:          |     

Review
FEATURES OF ATMOSPHERIC ELECTROMAGNETIC CASCADES PRODUCED AT LOW HEIGHTS
JING Gui-Ru, JING Cai-Liu, ZHU Qing-Qi, DING Lin-Kai
1986, 10(3): 257-264.
Abstract:
The electromagnetic cascade processes in the atmosphere is simulated three-dimensionally. The number, the mean energy spectrum and the transverse behaviour of secondary particles of electromagnetic cascades produced at different heights (within 1.5c.u) are analysed.
THE IN-FIELD CALIBRATION OF ALBEDO NEUTRON DOSIMETER
LEI Chuan-Heng, WU Jing-Min, LIU Lie-Fu
1986, 10(3): 265-270.
Abstract:
Albedo neutron personnel dosimeter has been more and more widely used due to its small volume and easy in measurement. Great attention should be paid to the calibration technique which finally determines the error of the measurement. In fact, thereusually exists certain difference between the energy spectrum of the radioactive source for calibration and that of the radiation field to be measured. In order to improve the accuracy of the measurement, the problem of the in-field calibration technique should be solved. In this paper, the method of the in-field calibration and the use of so-called Bonner cylinder for the in-field calibration of accelerator are deseribed.
SU(9) GRAND UNIFICATION MODEL OF SUBQUARKS
ZHANG Xin-Min, XUE Xiao-Zhou
1986, 10(3): 271-276.
Abstract:
An improved version of the grand unification composite model propose earlier is suggested. Under the hypothesis of partly broken global chiral symmetry, we give the four family of Fermions at low energies to realize unification of four family of Fermions. Neutrino may acquire naturally the Dirac mass. Proton lifetime and weak neutral current at low energy are consistent with experimental results.
THE EMC EFFECT AND THE EFFECTIVE BAG RADIUS
YAN Zong-Chao, WANG Xing-Min, YIN Peng-Cheng
1986, 10(3): 277-282.
Abstract:
In this paper, We present a view point that the reduction of bounded nucleon radius naturally explains the EMC effect. Some discussion is given at the end of the paper concerning the prevalent explanations about the EMC effect.
A NEW CO-BOUNDARY OPERATOR AND ITS APPLICATIONS
ZHOU Guang-Zhao, WU Yue-Liang, XIE Yan-Bo
1986, 10(3): 283-287.
Abstract:
In this note new co-boundary operators are defined in the product form. The associative composition law of spatial translation group field is discussed using these new operators. The quantization condition of monopoles in SU(2) and SU(3) gauge theories follows easily from the new formalism.
A VARIATIONAL RESEARCH FOR HADRON SPECTRUM
HU Lian, GUO Shuo-Hong
1986, 10(3): 288-296.
Abstract:
Based on lattice QCD, we use the linear variational method to calculate the hadron spectrum and wave functions, our results are in reasonable agreement with experiment in the region of medium coupling constant.
THE ANALYTIC RESULTS FOR U1 AND SU2 AVERAGE PLAQUETTE TO THE THIRD ORDER APPROXIMATION IN THE CUMULANT EXPANSION
WU Ji-Min, ZHAO Pei-Ying
1986, 10(3): 297-307.
Abstract:
In the lattice gauge theory, by using cumulant expansion, we calculate the average plaquette for U1 and SU2 group up to the third order approximation in 4 and 5 dimensions analytically. Our results are consistent with MC data. We also discuss the application of cumulant expansion techneque in lattice theory.
THE RIGHT-HANDED CURRENTS OF NEUTRINOLESS DOUBLE β DECAY IN 48Ca
WU Hui-Fang
1986, 10(3): 308-315.
Abstract:
Right-handed Currents in 0νββ decay with lepton-number nonconservation is discussed by using two nucleons mechanism and the effective operator approach of nuclear matrix elements in this paper. The relation between the mixing parameter η of right-handed currents and the Majorana neutrino mass mν is calculated from the experimental decay lifetime of 0νββ decay in 40Ca. Our results show that i) mν≤(18~23)eV, if |η|=0;ii) |η|≤(1.6~2)×10-5, if mν=0
THE INVESTIGATION OF AN UNDULATOR FOR THE HEFEI 800MeV ELECTRON STORAGE RING
CHEN Zhi-Cheng, LIU Jian-Yang, XU Jian-Ming
1986, 10(3): 316-322.
Abstract:
In this paper, the design investigation and magnetic field measurement of a 10 period hybrid undulator are given.
STUDY OF DEEP INELASTIC COLLISION 12C+27Al AT ENERGY 61.8MeV
FENG En-Pu, WANG Qi, ZHU Yong-Tai, YIN Xu, MIAO He-Bin, SUN Shu-Ming, LI Song-Lin, WU Zhong-Li, FAN Guo-Ying, XIE Yuan-Xiang, ZHAN Wen-Long
1986, 10(3): 323-329.
Abstract:
By using ΔE-E telescope and the time of flight detector, the energy spectra of products between 6Li and 16O were measured for the reaction 12C+27Al, at 61.8MeV. The contour plots of differential cross section in c.m. system and the angular distributions of emitted fragments were obtained. The calculated values of fully relaxed energies in deep inelastic collistions agree with the experimental values. The mean interaction time of di-nuclear system was estimated as from 1×10-21s to 1.4×10-22s
A STUDY OF THE ISOSCALAR GIANT RESONANCE IN 40Ca
LI Zhu-Xia, ZHANG Xi-Zhen
1986, 10(3): 330-334.
Abstract:
The strength functions of the isoscalar giant resonance monopole resonance and giant quardropole resonance in 40Ca are calculated by coupling the 1p-1h states to 2p-2h states. The results can explain the recent experimental data.
MICROSCOPIC OPTICAL POTENTIAL CALCULATIONS OF FINITE NUCLEI WITH EXTENDED SKYRME FORCES
YUAN Hai-Ji, YE Wei-Lei, GAO Qin, SHEN Qing-Biao
1986, 10(3): 335-342.
Abstract:
Microscopic optical potential calculations in the Hartree-Fock (HF) approximation with Extended Skyrme forces are investigated. The HF equation is derived from the variation principle and the potential formula of spherical nuclei is obtained by two different ways. Then the calculations for symmetric nuclei 16O, 40Ca and asymmetric nucleus 90Zr with eight sets of Skyrme force parameters are presented. Our results show that the potential from and variating tendency with incident energy are reasonable and there apparently appears a "wine-bottle-bottom" shape in the intermediate energy region. Furthermore, our calculations reflect shell effects clearly.
TRACELESS OPERATORS AND SO6 WAVE FUNCTIONS OF sd BOSONS
XU Fu-Xin, CUI Ke-Fan
1986, 10(3): 343-348.
Abstract:
Traceless operators of sd bosons are introduced and used to construct the SU6SO6SO5SO3 wave functions of sd bosons according to the method of T.S.Yang
A STUDY OF THE NUCLEAR POTENTIAL BETWEEN TWO NUCLEI
WANG Zheng-Da
1986, 10(3): 349-353.
Abstract:
According to the physical picture of dinucleus molecule and considering the particle-hole interaction between two nuclei, the exchange of valence nucleons and nuclear potential between two nuclei were studied.
A NEW TRANSITION BRANCH OF THE 5.2 SEC ISOMER IN 183W
GUI Shou-Zao, LIU Jing-Yi, XIAO Gen-Lai, TIAN Jia-Qi
1986, 10(3): 354-357.
Abstract:
During the bombardment of 14.8MeV neutron on natural wolfram samples a γ-ray with energy 291.7keV and halflife 5.17±0.03 sec is observed. From the experimental facts it is assumed that in addition to the two well known transition branches from the decay of 5.2 sec isomer in 138W there exists another 11/2+11/2[615]→5/23/2[512] isomeric (E3) transition. The hindrance factor of this new transition is calculated. It is well cosistent with the general empirical rule of k forbidden isomeric transition.
THE ENERGY SPECTRUM AND WAVEFUNCTION OF NUCLEUS 31Si——A TEST ON THE COMPOSITE PARTICLE REPRESENTATION THEORY
WANG Bai-Lu
1986, 10(3): 358-362.
Abstract:
The nuclecus 31Si17 is studied by the composite particle representation theory and compared with the shell model calculations. It is shown that the entire energy spectrum agrees with the shell model results very well, and the wave function is equivalent to the shell model wavefunction exactly. Therefore it strongly supports the composite particle representation theory.
OBSERVATION OF EXCITED STATES IN 128Ba
ZHAO Zhi-Zheng, GUO Ying-Xiang, PAN Zong-You, XIAO Jian-Min, LEI Xiang-Guo, LIU Hong-Ye, SUN Xi-Jun
1986, 10(3): 363-366.
Abstract:
Excited states of 128Ba are investigated via the 120Sn(12C, 4nγ) 128Ba reaction by means of in-beam gamma spectroscopy Λ 12+ state other than the previously reported one is observed according to the properties of the 935.0keV γ-ray. It does not belong to the ground state band. Two new interband transitions, 224.8keV and 632.7keV, are observed and assigned to sidefeeding between the negative-parity band and ground state band.
STUDY OF ANTISYMMETRIZATION EFFECTS USING GENERATING COORDINALE METHOD
WU Guang-Han, YANG Dai-Lun, YANG Shi-Jun
1986, 10(3): 367-370.
Abstract:
The antisymmetrization effects in nuclear scattering are studied with GCM. The coulomb interaction is included and the energy dependence is discussed.
MEASUREMENT OF LOW MAGNETIC FIELD DISTRIBUTION OF A β SPECTROMETER
SUN Chen-Ren, LIN Shu-Yan, MAO Nai-Feng, SI Guo-Jian, WU Deng-Xi
1986, 10(3): 371-373.
Abstract:
The low magnetic field distribution of an iron-core double-focusing low-energy β spectrometer is measured with a second harmonic magnetic flux gate magnetometer, the relative measuring precision is better than ±0.05%. The field strength of the spectrometer is about 10G. This spectrometer is used to measure the β spectrum from tritium β decay for estimating the rest mass of electron antineutrion.
THE CORRECTION OF IBM SPECTRUM FOR CORE EFFECT
LIAO Ji-Zhi
1986, 10(3): 374-379.
Abstract:
It is proposed in this paper that the effect of the core of closed shells to IBM spectrum can be taken into account through the renormalization of the moment of inertia. Thus, the corrected IBM spectra can significantly improve the fitting of the experimental data at high spin states.
COMMUTATIVE PROPERTIES OF OPERATORS IN SCHWINGER BOSON PEPRESENTATION
FAN Hong-Yi
1986, 10(3): 380-384.
Abstract:
The angular momentum theory in the schwinger boson representation is developed to derive a new normal product expression for the commutator [eiaJx,eiβJy] by means of the integral technique within normal product, and the effect on the coherent state caused by two rotations which are in different seqences. Some new normal product expressions for exponential operators, such as eσJ-eλJ+ etc, are also derived and their applications in atomic coherent states are presented.