1978 Vol. 2, No. 5
Display Method: |
Abstract:
Computer calculations have been made on the dimensional solution to the anisotropic diffusion convection equation for solar cosmic rays propagating in an uniform and unbounded interplanetary medium. This paper presents the results calculated by means of Jokipii's diffusion coefficients. Discussion is restricted to the influences of solar wind convection on the rise to maximum times and on the peak intensities of solar cosmic ray events with solar corotation effect taken into consideration. The model well explains the asymmetrical variations of the propagation charateristics of the events with solar longitudes of their parents flares relative to the interplanetary magnetic field lines passing through the earth, and the theoretical curves of the rise times fit satisfactorily the observations of solar events ranging from relativistic to about 30 MeV medium energies.
Computer calculations have been made on the dimensional solution to the anisotropic diffusion convection equation for solar cosmic rays propagating in an uniform and unbounded interplanetary medium. This paper presents the results calculated by means of Jokipii's diffusion coefficients. Discussion is restricted to the influences of solar wind convection on the rise to maximum times and on the peak intensities of solar cosmic ray events with solar corotation effect taken into consideration. The model well explains the asymmetrical variations of the propagation charateristics of the events with solar longitudes of their parents flares relative to the interplanetary magnetic field lines passing through the earth, and the theoretical curves of the rise times fit satisfactorily the observations of solar events ranging from relativistic to about 30 MeV medium energies.
Abstract:
In this paper, the possibility that the newly discovered heavy particle γ （9.5） is a colour excited state of mesons in the SU（4）×S3α scheme of straton model is discussed. We point out that in the γ region, there are three colour excited states appearing as two peaks with mass difference about 0.5 GeV. The leptonic decays, hadronie decays, radiative decays, hadronic decays with electromagnetic interaction of the second order and the production behavior of γ are discussed. This model also predicts that many colour excited states of mesons accompanied with γ should exist with masses around 9.5 GeV and at least four weakly decaying particles should exist.
In this paper, the possibility that the newly discovered heavy particle γ （9.5） is a colour excited state of mesons in the SU（4）×S3α scheme of straton model is discussed. We point out that in the γ region, there are three colour excited states appearing as two peaks with mass difference about 0.5 GeV. The leptonic decays, hadronie decays, radiative decays, hadronic decays with electromagnetic interaction of the second order and the production behavior of γ are discussed. This model also predicts that many colour excited states of mesons accompanied with γ should exist with masses around 9.5 GeV and at least four weakly decaying particles should exist.
Abstract:
A simple method is proposed to obtain the classical monopole and dyon solutions in the case of SU(4) symmetry, which can be systematically generalized to the general case of SU(N). The solutions obtained in the SU(4) case correspond to magnetic charges of ±1/g,±√3/(2g),±1/(√2g).
A simple method is proposed to obtain the classical monopole and dyon solutions in the case of SU(4) symmetry, which can be systematically generalized to the general case of SU(N). The solutions obtained in the SU(4) case correspond to magnetic charges of ±1/g,±√3/(2g),±1/(√2g).
Abstract:
A simpler approximate formula to describe backward potential scattering at high energy is derived by neglecting the transverse monmentum transfer in the Green's propagator and, as examples, the numerical results are compared with the exact solutions.
A simpler approximate formula to describe backward potential scattering at high energy is derived by neglecting the transverse monmentum transfer in the Green's propagator and, as examples, the numerical results are compared with the exact solutions.
Abstract:
At an altitude of 3220 meters above sea level in Yunnan Province, we measured, by using a G-M counter-magnetic spectrometer, the vertical integratted momentum spectrum of the cosmic muon with momentum larger than 4 GeV/c. The spectrum obtained from this experiment is expressed by a power function in the form of I（>p）=Q （p+4）-1.86±0.06(cm-2·sr-1·s-1), where p is in GeV/c and Q is a constant. We also measured the charge ratio of muon in the 4—23 GeV/c momentum range. The result is Nμ/Nμ-=1.26±0.11. The error in the momentum measurement with spectrometer has been discussed and calculated.
At an altitude of 3220 meters above sea level in Yunnan Province, we measured, by using a G-M counter-magnetic spectrometer, the vertical integratted momentum spectrum of the cosmic muon with momentum larger than 4 GeV/c. The spectrum obtained from this experiment is expressed by a power function in the form of I（>p）=Q （p+4）-1.86±0.06(cm-2·sr-1·s-1), where p is in GeV/c and Q is a constant. We also measured the charge ratio of muon in the 4—23 GeV/c momentum range. The result is Nμ/Nμ-=1.26±0.11. The error in the momentum measurement with spectrometer has been discussed and calculated.
Abstract:
Single tracks of unaccompanÏed charged hadrons, within a horigontal area of 0.23m2 have been measured with a magnetic spectrometer, a pre-selector of momentum in combination with a multiplate cloud chamber in a laboratory at 3220m above sea level. Taking various possible corrections into account, the negative-positive ratio of charged hadrons was obtained as N-/N+=0.53±0.05 in the momentum range of 10-20 GeV/c. If we considered N+ contained only P and π+, N-were π-and that Nπ+/Nπ-=1, we deduced the result Nπ-/Np=0.9±0.1. Taking the form of the π-integral spectrum as j（>p）=Kp-γ, it was estimated that γ（?）2.3 in the momentum range 5—20 GeV/c. In this paper the integral verticel flux intensity of all charged hadrons was also estimated roughly, the result is:j⊥p+π（>12 GeV/c）=（7.4±0.7）×10-5/cm2·sг·s.
Single tracks of unaccompanÏed charged hadrons, within a horigontal area of 0.23m2 have been measured with a magnetic spectrometer, a pre-selector of momentum in combination with a multiplate cloud chamber in a laboratory at 3220m above sea level. Taking various possible corrections into account, the negative-positive ratio of charged hadrons was obtained as N-/N+=0.53±0.05 in the momentum range of 10-20 GeV/c. If we considered N+ contained only P and π+, N-were π-and that Nπ+/Nπ-=1, we deduced the result Nπ-/Np=0.9±0.1. Taking the form of the π-integral spectrum as j（>p）=Kp-γ, it was estimated that γ（?）2.3 in the momentum range 5—20 GeV/c. In this paper the integral verticel flux intensity of all charged hadrons was also estimated roughly, the result is:j⊥p+π（>12 GeV/c）=（7.4±0.7）×10-5/cm2·sг·s.
Abstract:
Formulae for the nuclear pairing-rotational (p.r.) and pairing-vibrational (p.v.) spectra are obtained using the PNC (particle-number-conserving) method. The quentum numbers characterizing the p.r. band, the braching ratios and the selection rule for two-particle transfer reactions are given. It is shown that the pairing-rotational scheme holds even for those nuclei near closed-shell, provided that the major-shell is not crossed. The anharmonic p.v. spectrum is shown to be equivalent to two sets of p.r. bands. The physical meaning of the parameters occuring in the p.r. and p.v. spectra is discussed.
Formulae for the nuclear pairing-rotational (p.r.) and pairing-vibrational (p.v.) spectra are obtained using the PNC (particle-number-conserving) method. The quentum numbers characterizing the p.r. band, the braching ratios and the selection rule for two-particle transfer reactions are given. It is shown that the pairing-rotational scheme holds even for those nuclei near closed-shell, provided that the major-shell is not crossed. The anharmonic p.v. spectrum is shown to be equivalent to two sets of p.r. bands. The physical meaning of the parameters occuring in the p.r. and p.v. spectra is discussed.
Abstract:
Inelastic scattered neutron spectra of metal hydrides ZrH1.66 and TiH1.92 have been measured by beryllium filter detector spectrometer and their phonon spectra have been deduced from the neutron spectra according to the A. Sjölander formula by iterative method. The optical branches of the two samples thus obtained are approximately Gaussian distributions and their positions are in agreement with other works, while their PWHM are smaller than the value uncorrected for multiphonons effect reported elsewhere. Their acoustic branches obtained are of neither Debye nor Gaussian type but show a double-numped configurations. Some new configurations have been observed between the optical and acoustic branches which may be attributed to localized modes as a result of disorder.
Inelastic scattered neutron spectra of metal hydrides ZrH1.66 and TiH1.92 have been measured by beryllium filter detector spectrometer and their phonon spectra have been deduced from the neutron spectra according to the A. Sjölander formula by iterative method. The optical branches of the two samples thus obtained are approximately Gaussian distributions and their positions are in agreement with other works, while their PWHM are smaller than the value uncorrected for multiphonons effect reported elsewhere. Their acoustic branches obtained are of neither Debye nor Gaussian type but show a double-numped configurations. Some new configurations have been observed between the optical and acoustic branches which may be attributed to localized modes as a result of disorder.
Abstract:
Using time of flight technique the elastic differential cross sections were measured for neutrons from natural Fe, Cu, and Pb in the energy range 1.10 to 1.40 MeV.The effect of neutron attenuation and multiple scattering in the sample is corrected by extrapolation of the experimental results. The correction of scattering angles due to the finite source-sample-detector geometry is also considered. The measured elastic differential cross sections are expressed by Legendre polynomial expansions, from which the total cross sections are obtained.The Optical-Model Calculations are carried out which show a reasonable consistency with the measured values.
Using time of flight technique the elastic differential cross sections were measured for neutrons from natural Fe, Cu, and Pb in the energy range 1.10 to 1.40 MeV.The effect of neutron attenuation and multiple scattering in the sample is corrected by extrapolation of the experimental results. The correction of scattering angles due to the finite source-sample-detector geometry is also considered. The measured elastic differential cross sections are expressed by Legendre polynomial expansions, from which the total cross sections are obtained.The Optical-Model Calculations are carried out which show a reasonable consistency with the measured values.
Abstract:
Abstract:
Abstract:
Abstract:
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 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 9, 2024) Measurement of solar pp neutrino flux using electron recoil data from PandaX-4T commissioning run
- Cover Story (Issue 2, 2024) | Quark/gluon taggers light the way to new physics
- Cover Story (Issue 8, 2024) | Applyingdeep learning technique to chiral magnetic wave search
Advertising
