1986 Vol. 10, No. 6
Display Method: |
Abstract:
The characteristics of electromagnetic and hadronic components in high energy cosmic rays at mountain altitude are studied by analysing single-shower events observed by mountain emulsion chamber. The chemical composition of primary cosmic rays in the energy region around 1014eV is studied by using Monte-Carlo simulation. The simulated power indices of energy spectra and attenuation lengths in air in agreement with the experimental data. The analysis of their vertical intensities indicates that the chemical composition of primary cosmic rays at energies around 1014eV is not contradicted to the simple extrapolation from lower energies and the abundance of protons can not be less than 30% and that of the nuclei with A≥2 not larger than 70%.
The characteristics of electromagnetic and hadronic components in high energy cosmic rays at mountain altitude are studied by analysing single-shower events observed by mountain emulsion chamber. The chemical composition of primary cosmic rays in the energy region around 1014eV is studied by using Monte-Carlo simulation. The simulated power indices of energy spectra and attenuation lengths in air in agreement with the experimental data. The analysis of their vertical intensities indicates that the chemical composition of primary cosmic rays at energies around 1014eV is not contradicted to the simple extrapolation from lower energies and the abundance of protons can not be less than 30% and that of the nuclei with A≥2 not larger than 70%.
Abstract:
Under the ladder approximation, the B-S equation for (dμ) atom is derived and the approximate solutions for l=0 are obtained. By using these solutions, the formation cross sections for the (dμ) atom in the radiative capture process are calculated.
Under the ladder approximation, the B-S equation for (dμ) atom is derived and the approximate solutions for l=0 are obtained. By using these solutions, the formation cross sections for the (dμ) atom in the radiative capture process are calculated.
Abstract:
Using Schrödinger wave function in quantum field theory, the time-dependent Green function and its spectral representation for 2-fermion system are derived, and the Schrödinger equation as well as the normalization condition of his wave function are deduced. The normalization condition shows that this wave function in just the probability amplitude when energy-dependence of potential can be neglected. The Green functions for some other equal-time equations are evaluated, however, the normalization of these equations remains to be solved and the potential is non-Hermitian.
Using Schrödinger wave function in quantum field theory, the time-dependent Green function and its spectral representation for 2-fermion system are derived, and the Schrödinger equation as well as the normalization condition of his wave function are deduced. The normalization condition shows that this wave function in just the probability amplitude when energy-dependence of potential can be neglected. The Green functions for some other equal-time equations are evaluated, however, the normalization of these equations remains to be solved and the potential is non-Hermitian.
Abstract:
The axial anomaly in lattice gauge theory with Wilson fermion is discussed. Under weak coupling approximation, we calculate the anomaly term systematically by path integral method. The result agrees with that obtained in continuum theory.
The axial anomaly in lattice gauge theory with Wilson fermion is discussed. Under weak coupling approximation, we calculate the anomaly term systematically by path integral method. The result agrees with that obtained in continuum theory.
THE EFFECTIVE INTERMEDIATE RANGE INTERACTION IN BARYON SPECTROSCOPY AND ITS EFFECT ON N-N INTERATION
Abstract:
In this paper, we introduce the phenomenological quark-quark intermediate range potential to fit the non-strange baryonic syectrum with N≤2 on the basis of the model of one-gluon exchange with a confining potential. It is shown that the calculated position of the resonanses below 2GeV can be in good agreement with experiments by taking an appropriate quark-quark intermediate range potential. The N-N interaction is also investigated with this new phenomenological potential.
In this paper, we introduce the phenomenological quark-quark intermediate range potential to fit the non-strange baryonic syectrum with N≤2 on the basis of the model of one-gluon exchange with a confining potential. It is shown that the calculated position of the resonanses below 2GeV can be in good agreement with experiments by taking an appropriate quark-quark intermediate range potential. The N-N interaction is also investigated with this new phenomenological potential.
Abstract:
By using the nontrivial rephasing invariants Δia of the KM matrix, all the factors which suppress CP violation effects in the standard model with three generations are discussed. They are: Im Δia/γ (KM), the uneveness in magnitudes of two quantities whose weak phases are going to be compared, the effects of strong phases, etc. The arguments are supported by examples.
By using the nontrivial rephasing invariants Δia of the KM matrix, all the factors which suppress CP violation effects in the standard model with three generations are discussed. They are: Im Δia/γ (KM), the uneveness in magnitudes of two quantities whose weak phases are going to be compared, the effects of strong phases, etc. The arguments are supported by examples.
Abstract:
In the framework of Glauber theory the recent pion inelastic scattering data on 12C at 800MeV/c are analysed by using the transition density method. The degree of agreement between the theoretical results with different parameters and the experimental data are discussed. The Coulom effect for pion-12C inelastic scattering is also considered.
In the framework of Glauber theory the recent pion inelastic scattering data on 12C at 800MeV/c are analysed by using the transition density method. The degree of agreement between the theoretical results with different parameters and the experimental data are discussed. The Coulom effect for pion-12C inelastic scattering is also considered.
Abstract:
The principle of the wake field accelerator is summarily described. Special emphasis is put on the transverse stability of the central beam. A limitation of the central beam by using solenoid is presented. The efficiency to stabilize the central beam by means of a "Continious" and optimized focusing system is researched.
The principle of the wake field accelerator is summarily described. Special emphasis is put on the transverse stability of the central beam. A limitation of the central beam by using solenoid is presented. The efficiency to stabilize the central beam by means of a "Continious" and optimized focusing system is researched.
Abstract:
The excitation function for 12C+28Si complete fusion reaction was measured in incident energy 43—70.5MeV with a ΔE-E counter telescope. The experimental complete fusion excitation function shows some gross oscillation structures. The mean behaviour of the experimental data fits the potential model and the statistical Yrast line model well.
The excitation function for 12C+28Si complete fusion reaction was measured in incident energy 43—70.5MeV with a ΔE-E counter telescope. The experimental complete fusion excitation function shows some gross oscillation structures. The mean behaviour of the experimental data fits the potential model and the statistical Yrast line model well.
Abstract:
The radiative capture cross section at thermal neutron energy in 40Ca, 410mb, is much higher than that expected by the statistical theory as well as by the direct capture theory. This study shows that this is a result of the constructive interference between potential capture and valence capture. By using the Becchettic-Greenless optical model potential[7] and in-cluding the interference effect, the thermal neutron induced radiative capture cross section and scattering cross section in 40Ca were calculated and compared with measured data.
The radiative capture cross section at thermal neutron energy in 40Ca, 410mb, is much higher than that expected by the statistical theory as well as by the direct capture theory. This study shows that this is a result of the constructive interference between potential capture and valence capture. By using the Becchettic-Greenless optical model potential[7] and in-cluding the interference effect, the thermal neutron induced radiative capture cross section and scattering cross section in 40Ca were calculated and compared with measured data.
Abstract:
In this paper, the spectrum variation of the deformed even-even nuclei which deviate from the SU(3) limit of the U(15) model is discussed. It is shown that the probability of the g-boson is crucial for some features of the spectrum structure.
In this paper, the spectrum variation of the deformed even-even nuclei which deviate from the SU(3) limit of the U(15) model is discussed. It is shown that the probability of the g-boson is crucial for some features of the spectrum structure.
Abstract:
After evaluating NN scattering phase-shifts of (s,t)=(0,1),(1,0),l=0.2 with two sets of parameters, the contributions of specific terms of qq interaction or specific exchange mechanisms to the short-range NN interaction are analyzed.
After evaluating NN scattering phase-shifts of (s,t)=(0,1),(1,0),l=0.2 with two sets of parameters, the contributions of specific terms of qq interaction or specific exchange mechanisms to the short-range NN interaction are analyzed.
Abstract:
A general expansion in Taylor series of space magnetic field (median plane symetry or nonsymetry) expressed in terms of the field in the φ=φ0 meridian plane, which may be expressed analytically or by field values at discrete nodes, is derived in cylindrical coordinate system.
A general expansion in Taylor series of space magnetic field (median plane symetry or nonsymetry) expressed in terms of the field in the φ=φ0 meridian plane, which may be expressed analytically or by field values at discrete nodes, is derived in cylindrical coordinate system.
Abstract:
By using the matrix elements of M-3Y force as the equivalent G-matrix elements, the spectra of 42Ca and 42Sc are calculated in the framework of the Folded Diagram Method. The results show that such equivalent matrix elements are suitable for microscopic calculations of the nuclear structure in f-p shell.
By using the matrix elements of M-3Y force as the equivalent G-matrix elements, the spectra of 42Ca and 42Sc are calculated in the framework of the Folded Diagram Method. The results show that such equivalent matrix elements are suitable for microscopic calculations of the nuclear structure in f-p shell.
Abstract:
The single-particle (sp) and single-hole spectra in 40Ca are calculated with the Paris potential by two methods: (1) the eigenvalue equation derived from the sp Green function and (2) the sp potential uαβ=Mαβ(εβ) defined in terms of the mass operator Mαβ(ω). The energy dependence of G-matrix is taken into account rigorously. Our results agree with the experimental values fairly well. It is found that the Paris potential yields a somewhat better result than the RSC potential.
The single-particle (sp) and single-hole spectra in 40Ca are calculated with the Paris potential by two methods: (1) the eigenvalue equation derived from the sp Green function and (2) the sp potential uαβ=Mαβ(εβ) defined in terms of the mass operator Mαβ(ω). The energy dependence of G-matrix is taken into account rigorously. Our results agree with the experimental values fairly well. It is found that the Paris potential yields a somewhat better result than the RSC potential.
Abstract:
For the main drift chamber of Beijing Spectrometer, the most probable energy loss and particle identification capability for π, k, p, e are evaluated by using phenomenological approach. A simulation calculation with Landau distribution is also made.
For the main drift chamber of Beijing Spectrometer, the most probable energy loss and particle identification capability for π, k, p, e are evaluated by using phenomenological approach. A simulation calculation with Landau distribution is also made.
Abstract:
The "scaling in fragmentation region" given by UA5 Collaboration in pp Collider (SPS) experiments is investigated. It is pointed out that these phenomena support the limiting fragmentation hypothesis. The calculated results by using the stochastically decaying fire ball model fit the experimental data remarkably.
The "scaling in fragmentation region" given by UA5 Collaboration in pp Collider (SPS) experiments is investigated. It is pointed out that these phenomena support the limiting fragmentation hypothesis. The calculated results by using the stochastically decaying fire ball model fit the experimental data remarkably.
IF: 3.6
Monthly founded in 1977
Sponsored by:
ISSN 1674-1137 CN 11-5641/O4
Original research articles, Ietters and reviews Covering theory and experiments in the fieids of
- Particle physics
- Nuclear physics
- Particle and nuclear astrophysics
- Cosmology
Author benefits
- A SCOAP3 participating journal - free Open Access publication for qualifying articles
- Average 24 days to first decision
- Fast-track publication for selected articles
- Subscriptions at over 3000 institutions worldwide
- Free English editing on all accepted articles
News
- Chinese Physics C Outstanding Reviewer Award 2023
- Impact factor of Chinese Physics C is 3.6 in 2022
- 2022 CPC Outstanding Reviewer Awards
- The 2023 Chinese New Year-Office closure
- ãChinese Physics CãBEST PAPER AWARDS 2022
Cover Story
- Cover Story (Issue 12, 2024) | Doubly heavy meson puzzle: precise prediction of the mass spectra and hadronic decay with coupled channel effects to hunt for beauty-charm family
- Cover Story (Issue 9, 2024) Measurement of solar pp neutrino flux using electron recoil data from PandaX-4T commissioning run
- Cover Story (Issue 11, 2024) ï½ Form factor for Dalitz decays from J/Ï to light pseudoscalars
- Cover Story (Issue 3, 2024) | First measurement of the ground-state mass of 22Al helps to evaluate the ab-initio theory
- Cover Story (Issue 2, 2024) | Quark/gluon taggers light the way to new physics
Advertising
