1989 Vol. 13, No. 1
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U-tube pressure gauge is often used to measure the gas tightness of gas detector with flow mode.The formula to calculate the gas leakage rate of detector by this method is given,the effects of measuring accuracies of pressure and temperature to leakage rate are discussed as well.
The pulse shape and the intensity of Cerenkov light from extensive air shower have been recorded by using two different types of photomultipliers (fast and slow).The distribution of the FWHM of Cerenkov light pulse and the spectrum of Cerenkov photo density have been measured for E>5×1014eV,at sea level.Comparing the two intensity results from two types of tubes indicate that the system which consists of the slow tubes and the peak ADC is not only simple but also cheap for the Cerenkov light intensity measurement.
The influence of vibration,eccentricity of rotating coil magnetomenter on its accuracy is analysed in this paper.Results show that these influences can not be ignored.The relation between measuring error and vibration of the magnetometer is given in this paper also.
In this paper,the Mean-Field Approximation is applied to the soliton bag model to calculate static physical proporties of hadrons of hadrons numerically.After taking account of the quark masses and the corrections of the center of mass the gA/gV value is improved evidently and the hadron mass spectrum,the r.m.s charge radius and the magnetic moments of the hadrons are basically in agreement with their experimental values.A preliminary derivation of the mass differencs between the d and u guarks is presented.
We present a real-space renormalization-group analysis for Z2 lattice gauge theory coupled to a Higgs field in four dimension,the results show a phase diagram in which the Higgs and confined region are smoothly connected.
A correct relativistic nuclear model is presented on the ratios of structure functions FA(x,Q2) measured in DIS with several different nuclei.We shall assume here that a nucleus consists of nucleons,antinucleons and excess pions,the pions being associate with the meson exchange forces responsible for nuclear binding,only the baryon number is conserved.It is also considered that shadowing-antishadowing and Fermi motion.Our results are consistent with the available recent data.
Using the Hartree-Fock single particle energies and wave functions from a density-dependent Skyrme interaction and including the relativistic normalization corrections,we re-examine the contribution of the energy-momentum distribution of nucleons in nuclei to the EMC effect and conclude that the nuclear binding and the nucleon Fermi motion can not explain the EMC effect.
The sd-shell effective particle interactions are derived from the Paris potential and electric magnetic interactions using Green's function method.The 18Ne-18O Coulomb displacement energies are obtained by solving the energy spectra of nuclei with A=18.
The isoscalar giant surface resonance and giant dipole resonance in highly excited nuclei are discussed.Excitation energies of the giant modes in 208Pb are calculated in a simplified model,using the concept of energy weighted sum rule (EWSR),and the extended Thomas-Fermi approximation at the finite temperature is employed to describe the finite temperature equilibrium state.It is shown that EWSR and the enrgy of the resonance depend only weakly on temperature in the system.This weak dependence is analysed.
In this paper a simplified method for the calculation of average Coulomb energy in statistical model of the disassembly processes of hot nuclei is proposed.The effect of freeze-out volume is studied based on the assumption of Gaussion-like distribution.It is indecated that the centre and dispersion of Gaussion-like distribution somewhat reflect the location and the renge of liquid-gas coexistence phase.
Whether the degree of freedom of isospin states in highly excited compound nucleus is conservative or not gives the information of Coulomb interaction which affects the decay property of compound nucleus.The isospin dependent level decay widths of 30P are calculated by means of H.A.Weidenmuller's statistical theory.It takes the isospin coupling coefficients into account for transmission coefficients as well as for the total number of decay channels.This is the difference from that of Hauser-Feshbach formula.
Using the method of Green's function and partial summation of multiple scattering,we have investigated in various approximations the contribution of 2p-1h multiple scattering correlaion to the low energy spectrum of 17O and 15O,respectively.In our calculation,the nuclear force employed is the paris potential and the energy dependence of G matrices has been taken into account rigorously.The numerical results agree with the experimental data reasonably well.
A variational calculation of the mass gap in 2+1 dimensional SU(2) lattice gauge theory by using a Hamiltonian which possesses exact ground state and correct continuum limit is made.In the range 1.3≤1/g2≤7,a good scaling behaviour am=2.28g2 is obtained,which is in agreement with weak-coupling perturbation theory and the results obtained by another Hamiltonian which does not possess correct continuum limit.
In this paper we have got the angular distributions of the photon for the moments of process e+e－→J/ψ→γB(Jη),B(Jη)→P1P2. It provides a new way to determine the spin of ξ(2230).
The sympletic structures for bosonic strings are given by the method restricting J'Y to its Lagrangian submanifold and geometric quantization in BRST formulation for strings is discussed.It is found that conformal anomaly is cancelled when curvature of BRST vacuum bundle on G0=G0/H vanishes.
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