1981 Vol. 5, No. 6
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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.
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.
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.
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.
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.
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.
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 τ—νr. in model B is V—A. All light fermions in model C have left-handed charged weak current. All these models can accommodate mass relations: mα·mμ～md·mτ,mμ～3ms,mr～mb andgive the first Cabibbo angle sinθ1= √md/ms.
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 τ—νr. in model B is V—A. All light fermions in model C have left-handed charged weak current. All these models can accommodate mass relations: mα·mμ～md·mτ,mμ～3ms,mr～mb andgive the first Cabibbo angle sinθ1= √md/ms.
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.
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.
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.
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.
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.
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.
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.
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.
800 TeV
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.
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.
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 "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.
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.
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.
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 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.
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.
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.
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.
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.
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.
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.
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.
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.
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 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.
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.
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.
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