2001 Vol. 25, No. 5
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Abstract:
The experiment of the 50m2 RPC carpet, carried out at Yang Ba Jing, Tibet, is studied using Monte Carlo simulation. The simulation can re-produce the non-uniform azimuth angle distribution shown in experiment data and reaches the conclusion that it i...
The experiment of the 50m2 RPC carpet, carried out at Yang Ba Jing, Tibet, is studied using Monte Carlo simulation. The simulation can re-produce the non-uniform azimuth angle distribution shown in experiment data and reaches the conclusion that it i...
Abstract:
Recently experiments found that multiplicities of final state particles in high energy reactions and their masses satisfy a simple universal experienced formula. In this paper the multiplicities of directly producted mesons and baryons in e+e－ annihi...
Recently experiments found that multiplicities of final state particles in high energy reactions and their masses satisfy a simple universal experienced formula. In this paper the multiplicities of directly producted mesons and baryons in e+e－ annihi...
Abstract:
An improved lattice Hamiltonian is applied to the SU(3) lattice gauge theory in 2+1 dimensions. The glueball masses of 0+ and 0－ have been calculated by using the coupled-clusters expansion with the truncated eigenvalue equations in a scheme preservi...
An improved lattice Hamiltonian is applied to the SU(3) lattice gauge theory in 2+1 dimensions. The glueball masses of 0+ and 0－ have been calculated by using the coupled-clusters expansion with the truncated eigenvalue equations in a scheme preservi...
Abstract:
By employing nonrelativistic and four-dimentional relativistic harmonic oscillator models, the effects of the interference cross section between tranverse and longitudinal photons on the nucleon spin structure function are calculated. Remarkable infl...
By employing nonrelativistic and four-dimentional relativistic harmonic oscillator models, the effects of the interference cross section between tranverse and longitudinal photons on the nucleon spin structure function are calculated. Remarkable infl...
Abstract:
The in beam measurement of β+ delay α decay of 20Na on the Radioactive Ion Beam Line in Lanzhou(RIBLL) is reported. The radioactive ion 20Na was identified in beam by means of TOF-ΔE method. The implantation depth of the secondary beam in the detecto...
The in beam measurement of β+ delay α decay of 20Na on the Radioactive Ion Beam Line in Lanzhou(RIBLL) is reported. The radioactive ion 20Na was identified in beam by means of TOF-ΔE method. The implantation depth of the secondary beam in the detecto...
Abstract:
We have studied the fusion reaction for 11Be+208Pb near barrier by applying QMD model, and find taht in the fusion reaction induced by halo nuclei there simultaneously exist two mechanisms competing with each other. On one hand,11Be is a weakly bound...
We have studied the fusion reaction for 11Be+208Pb near barrier by applying QMD model, and find taht in the fusion reaction induced by halo nuclei there simultaneously exist two mechanisms competing with each other. On one hand,11Be is a weakly bound...
Abstract:
The pure-neutron matter together with the neutron skin or halo in Ca isotopes is studied using the Skyrme-Hartree-Fock model. It is shown that the pure-neutron-matter thickness depends not only on the Fermi levels of the neutrons, but also on the orb...
The pure-neutron matter together with the neutron skin or halo in Ca isotopes is studied using the Skyrme-Hartree-Fock model. It is shown that the pure-neutron-matter thickness depends not only on the Fermi levels of the neutrons, but also on the orb...
Abstract:
The squeeze out flow in the reactions of 124Sn+124Sn and 124Ba+124Ba at different energies for different impact parameters was investigated by means of isospin-dependent quantum molecular dynamics model. It was found that the more neutron rich system...
The squeeze out flow in the reactions of 124Sn+124Sn and 124Ba+124Ba at different energies for different impact parameters was investigated by means of isospin-dependent quantum molecular dynamics model. It was found that the more neutron rich system...
Abstract:
Within the framework of isospin-dependent Boltzmann-Langevin equation, the isotopic distribution in reaction systems of 14,16,18O+7,9Be at 28.7MeV/u were studied. It was found that the neutron rich (poor) nuclei were produced at the reaction of neutr...
Within the framework of isospin-dependent Boltzmann-Langevin equation, the isotopic distribution in reaction systems of 14,16,18O+7,9Be at 28.7MeV/u were studied. It was found that the neutron rich (poor) nuclei were produced at the reaction of neutr...
Abstract:
The structure and pertormance of vertex chamber of BESⅡ are described. It covers 95%×4π of solid angle with the spatial resolution of σrφ≈100μm and σz≈2mm respectively.
The structure and pertormance of vertex chamber of BESⅡ are described. It covers 95%×4π of solid angle with the spatial resolution of σrφ≈100μm and σz≈2mm respectively.
Abstract:
Two important directions in the development of proton linacs are high-current proton linacs (mainly applied in nuclear power field) and compact proton linacs (for proton therapy). There are some common characteristics in them: 1. Employment of the no...
Two important directions in the development of proton linacs are high-current proton linacs (mainly applied in nuclear power field) and compact proton linacs (for proton therapy). There are some common characteristics in them: 1. Employment of the no...
Abstract:
The ion induced instabilities in the electron ring of the proposed Beijing τ-charm factory (BTCF) are studied. First, we calculated the length of the filling gap which can clear the ions produced in last turn, then simulated the process of the fast b...
The ion induced instabilities in the electron ring of the proposed Beijing τ-charm factory (BTCF) are studied. First, we calculated the length of the filling gap which can clear the ions produced in last turn, then simulated the process of the fast b...
Abstract:
A new radioactive ion beam line designed to work at higher energy equivalent up to a magnetic rigidity of 10.64Tm is going to be constructed at Lanzhou. It is to connect the main ring and the experiment ring of the HIRFL-CSR complex. The separator is...
A new radioactive ion beam line designed to work at higher energy equivalent up to a magnetic rigidity of 10.64Tm is going to be constructed at Lanzhou. It is to connect the main ring and the experiment ring of the HIRFL-CSR complex. The separator is...
Abstract:
The calibration of the energy response of the detection elements for soft X-ray spectrometer is reported. The calibration is carried out Beamline 3W1B of Beijing Synchrotron Radiation Facility with beam intensity 40—80mA at electron energy 2.2GeV,usi...
The calibration of the energy response of the detection elements for soft X-ray spectrometer is reported. The calibration is carried out Beamline 3W1B of Beijing Synchrotron Radiation Facility with beam intensity 40—80mA at electron energy 2.2GeV,usi...
Abstract:
A novel model for the inter-bunch interference in a bunch train is presented where a train of electron bunches passing through a bending or undulator magnetic field is considered as a moving multi slit diffraction array from which multi beams of cohe...
A novel model for the inter-bunch interference in a bunch train is presented where a train of electron bunches passing through a bending or undulator magnetic field is considered as a moving multi slit diffraction array from which multi beams of cohe...
Abstract:
Beijing Spectrometer (BES) at Beijing Electron Positron Collider (BEPC),IHEP has accumulated 2.5×107 J/ψ events and plans to increase this number to 108—109 in the near future. In this paper I review and summarize the recent studies on the possibilit...
Beijing Spectrometer (BES) at Beijing Electron Positron Collider (BEPC),IHEP has accumulated 2.5×107 J/ψ events and plans to increase this number to 108—109 in the near future. In this paper I review and summarize the recent studies on the possibilit...
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ISSN 1674-1137 CN 11-5641/O4
Original research articles, Ietters and reviews Covering theory and experiments in the fieids of
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- Cosmology
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