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《中国物理C》(英文)编辑部
2024年10月30日

1981 Vol. 5, No. 6

Display Method:          |     

Review
ELASTIC π--12C SCATTERING IN THE α-PARTICLE MODEL
LI QING-RUN, CHEN SHENG-ZHONG, ZHAO EN-GUANG
1981, 5(6): 641-647.
Abstract:
At the pion energies of 120, 150, 180, 220, and 260 MeV, the calculation of the cross section of the elastic π--12C scattering are performed within Glauber theory on the basis of the independent α-particle model. The theoretical results are in agreement with experiments. In the lower energy region sensitive to the wave function, our results are better than the results obtained by others using α-particle model.
EIGEN SOLUTION OF B-T EQUATION FOR COMPLEX SQUARE POTENTIAL WELL
HAN HUI-YI, ZHEN CHANG-YIN, GENG TIAN-MING, WU HUI-FANG
1981, 5(6): 648-652.
Abstract:
On solving the B-T equation for complex square well potential, the narrow width structures of bound states of pp system are obtained. Comparing it with the result of non-relativistic approximation, the maximum correction of position of energy level—ΔE1 is several tens MeV, the maximum correction of annihilated width—ΔE2, is about more than ten MeV.
OPERATOR THEORY OF HADRON SCATTERING IN GEOMETRICAL MODEL
YIN LO, LI YANG-GUO, LIU XIAN-HUI
1981, 5(6): 653-663.
Abstract:
In geometrical picture we formulate an operator theory for two body hadron scattering ab→ cd. Using a unified S-matrix we are able to derive formula for elastic scattering, diffractive scattering, inelastic ollision and double exchange collision in samilar fashion. It can reproduce most of the scalar results when spin effects are neglected. In double charge exchange collision, fits with experimental data are satisfactory.
GENERATION PROBLEM AND SO(14) GRAND UNIFIED THEORIES
MA ZHONG-QI, DU DONG-SHENG, XUE PEI-YOU, ZHOU XIAN-JIAN
1981, 5(6): 664-681.
Abstract:
Three models of grand unified theory based on SO(14) gauge group are proposed. They can accommodate four generations of odinary fermions. Model A, where the charged weak currents of the fermions in the first and second generations are V-A and that of the fermions in the third and fourth generations are V + A, is a natural model from the point of view of structure of SO(14). In model B, we obtain the nice value of Weinberg angle: sin2θw=0.225 and the masses of W± and the ordinary Z° are a factor 1.7 larger than those in SU(5) standard model. Model B predicts another neutral vector boson which couples with the fermions in the first two generations like a heavy photon with the mass of the order of 100 GeV. The coupling of τνr. in model B is VA. All light fermions in model C have left-handed charged weak current. All these models can accommodate mass relations: mα·mμ~mmτ,mμ~3ms,mr~mb andgive the first Cabibbo angle sinθ1= md/ms.
ON THE SU(3) INSTANTONS WITH TOPOLOGICAL CHARGE 4
GUO SHUO-HONG, CHEN QI-ZHOU, GUAN HONG
1981, 5(6): 682-686.
Abstract:
The configurations of the SU(3) instantons with topological charge 4 are discussed, and their zero mode and non-zero mode factors as well as their contributions to the interaction potential of heavy quark pairs are evaluated. It is shown that the contributions of these configurations can be neglected as compared with those of the configurations of four far-separated single instantons.
EQUATION OF BEAM ENVELOP FUNCTIONS AND THEIR APPROXIMATE SOLUTIONS
WEI KAI-YU
1981, 5(6): 687-693.
Abstract:
The normalized equations of beam envelop functions βu(u = x, y, z) are described. These equations can be used to describe the envelop and emittanee shape of relativistic beam and non-relativistic beam in accelerative systems and transport systems.In the paper, we also described an approximate method solving these equations in the case to take into account acceleration process and beam space charge effect, and have obtained the expressions of the approximate solutions in this case.
AN EXTENSION OF MARTIN-GROSSE THEOREM ON THE ORDER OF LEVELS
SU RU-KENG, LIANG JUN
1981, 5(6): 694-698.
Abstract:
The Matin-Grosse, theorem is extended to the energy levels of 2P and 3D states. Four sufficient conditions are given for determining the order of 2P and 3D levels.
ANOMALOUS MAGNETIC MOMENT IN COMPOSITE MODEL OF LEPTONS
HUANG CHAO-SHANG, DAI YUAN-BEN
1981, 5(6): 699-705.
Abstract:
We illustrate with a simple model that the composite model of the lepton may naturally account for the experimental value of the anomalous magnetic moment provided that the charge radius of the bound state is sufficiently small and masses of constituents are sufficiently large.
AN ULTRAHIGH ENERGY COSMIC RAY EVENT WITH ∑Eγ800 TeV
REN JING-RU, LU SUI-LING, KUANG HAO-HUAI, SU SHI, WANG YUN-XIN, WANG DIAN-CHEN, FAN HAI-KUN, HU WEN-JUN, XUE YONG-GUI, WANG CHENG-RUI, HE MAO, ZHANG NAI-JIAN, CAO PEI-YUAN, LI JIN-YU, CHEN YUN-HONG, YANG SHI-ZHI, LIU JIAN-GUO, GENG QING-XI
1981, 5(6): 706-711.
Abstract:
An emulsion chamber of area 5m2 and thickness 40 c.u. was installed at Mt. Kambala (5500m above the sea level), Tibet, China and exposed for one year. A γ-ray family event with ∑Er≥800 TeV is found in the chamber. The striking feature. of the event is that most of the high energy spots are located far from the energy-weighted center of the event, while numerous low energy spots are concentrated near the energy center.
DESIGN AND TESTS OF A PRESSURED "PIERCE" TYPE HIGH GRADIENT ACCELERATING TUBE OF 250 keV
CONG ZHI-BING, YU QING-CHANG, LI JI-GANG, LIANG JIA-MING, MA XING-HUA, LIU DIAN-KUI, LU HONG, XIA DE-HONG, SHU CHUAN-YU, ZHANG CAN-YING, LIU TIE-ZHU, YANG YOU-SHAN
1981, 5(6): 712-721.
Abstract:
A "Pierce" type pressured accelerating tube has been manufactured in our laboratory. A 240 mA pulsed beam was obtained from this tube at 250 keV. The design and the tests of this accelerating tube are described in detail.
A HIGH GRADIENT 250keV PULSED PROTON BEAM ACCELERATING EQUIPMENT
1981, 5(6): 722-731.
Abstract:
Up to 240 mA of pulsed proton beam has been extracted at 250 keV from an accelerating equipment with a high gradient "Pierce" accelerating tube. Normalized beam emittance is 0.36π cm-mrad (at 180 keV, 120 mA 100μs, 10pps). The design parameters and some preliminary test results of this equipment including a 250 kV C-W high voltage generator, an accelerating tube and a duoplasmatron are reported in this paper. This equipment is built for BPS preinjector study.
NEUTRON CAPTURE GAMMA RAY SPECTRA AT LOW ENERGY
HO YU-KUN
1981, 5(6): 732-740.
Abstract:
A model to calculate the neutron induced radiative capture spectra in the resonance region is proposed. Three reaction mechanisms has been taken into account, i.e. statistical processes, potential capture and the capture in the compound elastic channel. The thermal neutron capture spectra and multiple numbers of photon for some nuclei in the 3s resonance region: 51V, 55Mn, 52Cr etc. are calculated. It is shown that the including of the radiative capture in the compound elastic channel will improve obviously the coincidence of the theoretical calculations with the experiments, especially in the high energy parts of the spectra.
A DISCUSSION ON THE MASS OF MONOPOLE
WANG MING-ZHONG, ZHENG XI-TE, XIAN DING-CHANG, ZHANG ZHENG-GANG
1981, 5(6): 741-743.
Abstract:
In this paper, we apply the view point of Spinor monopole, with a concrete example, to show that under the case of negative solution, the mass of monopole may be less than 104 GeV, which is calculated by general theory. If we select the parameters carefully, we may obtain more less mass of monopole.
THE FURTHER DISCUSSION OF GAUGE HIERARCHY
WANG KE-LIN, BAO XI-MING, LIU ZU-WEI, CHEN LIN
1981, 5(6): 744-750.
Abstract:
In this paper, the Higgs potential of one-loop correction is calculated in the gauge model of SU(3) and SU(5) symmetry. The result shows that there is no arbitrary gauge hierarchy. This is contrasted with the result of Mohapatra et al.
THE ENERGY SPECTRA OF Λ4He AND Λ4H
WU HUI-FANG, SHEN JIAN-PING, YU YOU-WEN, ZHANG ZONG-YE
1981, 5(6): 751-753.
Abstract:
In this paper we have calculated the A-separation energies and the energy spectra of Λ4He and Λ4H using the Λ-N meson exchange potential which we have obtained. For simplicity, we assume that the radial part of single particle is taken to be the experimental charge form factor of 4He. The results are in good agreement with the experimental data.
MEASUREMENTS OF NUMBER OF RADIOACTIVE ATOMS AND HALF-LIFE (Ⅰ)
FENG XI-ZHANG, ZHAO ZHEN-LAN, LO SHI-HUA, ZHANG JING-LIE, GUO YING-HUAN, XU YUAN-BIAO, YANG RUI-YING, HUANG ZHONG-XIANG, ZHANG YUAN-JI, SU ZHI-XIN, LI ZUO-QIAN, MA GUO-HUI
1981, 5(6): 754-760.
Abstract:
The decay of 99mTc source was used to verify experimentally that in the measurement of the number of atoms of a radioactive isotope in a sample at time t0, the error introduced through the inaccuracy of its decay constant (λ) can be reduced to a much smaller value by the careful selection of the time of measurement or measurements of its radioactivity at around one life time (1/λ) after t0 and doing the calculation.
MULTIWIRE PROPORTIONAL DRIFT CHAMBER
SHEN CHANG-QUAN, LI GUANG-HUA, ZHANG GUO-HUA, FAN ZHEN-ZI
1981, 5(6): 761-764.
Abstract:
A Multiwire proportional chamber with a large drift space has been made. Its sensitive volume is 310×110×176 mm3, the energy resolution is 22% (FWHM). It may be used as a efficient detector which can detect the X-ray in the region of 3—30 keV on a large area, for example, the transition radiation in the X-ray region.
A SIMPLE METHOD OF CALCULATING MOMENT OF INERTIA AT GROUND STATES OF EVEN-EVEN NUCLEI
WANG ZHENG-DA, ZHENG MAN-JIAO
1981, 5(6): 765-768.
Abstract:
A effective method of calculating moment of inertia at ground state of even-even deformations nuclei is derived based on rigid rotation and collective rotation nature of quantum systems.