2003 Vol. 27, No. 1
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Abstract:
The beam collision center of the BEPC has slightly shifted from geometrical origin of the BES detector and the beam bunch of the BEPC also has certain size. For these reasons, to measure Kso lifetime, primary vertex reconstruction must be carried out...
The beam collision center of the BEPC has slightly shifted from geometrical origin of the BES detector and the beam bunch of the BEPC also has certain size. For these reasons, to measure Kso lifetime, primary vertex reconstruction must be carried out...
Abstract:
The scale for visible jets produced in e+e－ Collisions is studied in some details using Monte Carlo method. It is demonstrated, based on the historical fact that the 3-jet events were firstly observed in e+ e- experiments at √S=17—30GeV,and the relat...
The scale for visible jets produced in e+e－ Collisions is studied in some details using Monte Carlo method. It is demonstrated, based on the historical fact that the 3-jet events were firstly observed in e+ e- experiments at √S=17—30GeV,and the relat...
Abstract:
Using decomposition of the SU(2) gauge field in terms of unit vector field, we have discussed circulation condition of the spin-1/2 Bose-Einstein dendensate. For the two-component Bose-Einstein condensate,the SU/(2) symmetry of the internal states le...
Using decomposition of the SU(2) gauge field in terms of unit vector field, we have discussed circulation condition of the spin-1/2 Bose-Einstein dendensate. For the two-component Bose-Einstein condensate,the SU/(2) symmetry of the internal states le...
Abstract:
The excited odd qs-coherent state aqs+m|α〉qso and excited even qs-coherent state aqs+m|α〉qseare constructed. The q,s, and m dependences of the antibunching effect are numerically studied. It is shown that for smallr , the excited even qs-coherent sta...
The excited odd qs-coherent state aqs+m|α〉qso and excited even qs-coherent state aqs+m|α〉qseare constructed. The q,s, and m dependences of the antibunching effect are numerically studied. It is shown that for smallr , the excited even qs-coherent sta...
Abstract:
Coherent states and the extension to the even and odd coherent states, and further to the eigenstates of the higher power of the annihilation operator are basic and important macroscopic quantum states in quantum field theory. Recently, these investi...
Coherent states and the extension to the even and odd coherent states, and further to the eigenstates of the higher power of the annihilation operator are basic and important macroscopic quantum states in quantum field theory. Recently, these investi...
Abstract:
The high spin states of 85Zr were populated by using fusion evaporation 60Ni (28Si,2pn)85Zr reaction. The r-r coincidence and DCO ratios were measured with 10 HPGe-BGO detectors at beam energy 102 MeV. A level scheme with 43 levels and 75 r-transitio...
The high spin states of 85Zr were populated by using fusion evaporation 60Ni (28Si,2pn)85Zr reaction. The r-r coincidence and DCO ratios were measured with 10 HPGe-BGO detectors at beam energy 102 MeV. A level scheme with 43 levels and 75 r-transitio...
Abstract:
The cross sections for Pb(n,x)203Hg,W(n,x)l82Ta and W(n,x)183Ta reactions have been measured by the activation method. The neutron fluences were determined by the cross sections of 93Nb (n,2n)92mNb reaction. The neutron energies in the measurements w...
The cross sections for Pb(n,x)203Hg,W(n,x)l82Ta and W(n,x)183Ta reactions have been measured by the activation method. The neutron fluences were determined by the cross sections of 93Nb (n,2n)92mNb reaction. The neutron energies in the measurements w...
Abstract:
Within the isospin dependent Extended Brueckner-Hartree-Fock framework, the Hugenholtz-Van Hove theorem in isospin asymmetric nuclear matter has been investigated and discussed for different orders of approximation made according to the truncation le...
Within the isospin dependent Extended Brueckner-Hartree-Fock framework, the Hugenholtz-Van Hove theorem in isospin asymmetric nuclear matter has been investigated and discussed for different orders of approximation made according to the truncation le...
Abstract:
Assuming a single-particle 2p structure of 13C, we study proton-13C elastic scattering at the incident energy of 1 GeV in the Glauber multiple scattering theory. A good agreement between theoretical prediction and corresponding experimental data is o...
Assuming a single-particle 2p structure of 13C, we study proton-13C elastic scattering at the incident energy of 1 GeV in the Glauber multiple scattering theory. A good agreement between theoretical prediction and corresponding experimental data is o...
Abstract:
Base on Brohm's Statistic-Ablation-Abrasion (SAA) model, the modified SAA model was developed via introducing the isospin dependence of nucleon distribution in nucleus and parameterized formulas for nucleon-nucleon cross section in nuclear matter. It...
Base on Brohm's Statistic-Ablation-Abrasion (SAA) model, the modified SAA model was developed via introducing the isospin dependence of nucleon distribution in nucleus and parameterized formulas for nucleon-nucleon cross section in nuclear matter. It...
Abstract:
The possible reasons for the discrepancy between calculation results based on the statistical evaporation model and experimental data of giant dipole resonance of very hot nuclei are discussed. Both of simulations with the standard CASCADE code and t...
The possible reasons for the discrepancy between calculation results based on the statistical evaporation model and experimental data of giant dipole resonance of very hot nuclei are discussed. Both of simulations with the standard CASCADE code and t...
Abstract:
The experimental measurements have provided the evidence that the suppression of fusion cross-section caused by quasi-fission is very important for the synthesis of super-heavy nuclei by heavy ion collisions. The potential energy surface due to the n...
The experimental measurements have provided the evidence that the suppression of fusion cross-section caused by quasi-fission is very important for the synthesis of super-heavy nuclei by heavy ion collisions. The potential energy surface due to the n...
Abstract:
The transverse flow in heavy ion collisions can be characterized by the azimuthal anisotropy of the final state particles. A clear signature of the azimuthal correlation between directed and elliptic flow is evidenced in the model calculations . It i...
The transverse flow in heavy ion collisions can be characterized by the azimuthal anisotropy of the final state particles. A clear signature of the azimuthal correlation between directed and elliptic flow is evidenced in the model calculations . It i...
Abstract:
Based on the kinetic theory, the distribution function for fermions in quasi-equilibrium QGP, which is perturbed by the fluctuation of the color field, has been obtained. Furthermore, the physical bases that decide the departure factor are analyzed. ...
Based on the kinetic theory, the distribution function for fermions in quasi-equilibrium QGP, which is perturbed by the fluctuation of the color field, has been obtained. Furthermore, the physical bases that decide the departure factor are analyzed. ...
Abstract:
We briefly review the kinetic equations obeyed by classical non-Abelian plasmas. We get analytical effective mass including the effects of temperature and chemical potential when the contributions of both quark and anti-quark are considered. We deriv...
We briefly review the kinetic equations obeyed by classical non-Abelian plasmas. We get analytical effective mass including the effects of temperature and chemical potential when the contributions of both quark and anti-quark are considered. We deriv...
Abstract:
Monte Carlo method is used to simulate the process of avalanching and signal collection of the Multi-gap Resistive Plate Chambers (MRPC) . The result is compared with experimental data to probe the detection efficiency and signal amplitude of MRPC. T...
Monte Carlo method is used to simulate the process of avalanching and signal collection of the Multi-gap Resistive Plate Chambers (MRPC) . The result is compared with experimental data to probe the detection efficiency and signal amplitude of MRPC. T...
Abstract:
The two-dimensional position sensitive silicon detector has been tested using Tu a source and ion beams provided by HIRFL + RIBLL. The operation conditions have been studied carefully for best energy resolution, position resolution and position linea...
The two-dimensional position sensitive silicon detector has been tested using Tu a source and ion beams provided by HIRFL + RIBLL. The operation conditions have been studied carefully for best energy resolution, position resolution and position linea...
Abstract:
The nonlinear transport of intense pulsed beams is analyzed with the Lie algebraic method in the case of K-V distribution , and the particle trajectories of second order approximation in the 6-D phase space (x,x′,y, y′, τ, pτ) are obtained. The beams...
The nonlinear transport of intense pulsed beams is analyzed with the Lie algebraic method in the case of K-V distribution , and the particle trajectories of second order approximation in the 6-D phase space (x,x′,y, y′, τ, pτ) are obtained. The beams...
Abstract:
A theoretical analysis for energy resolution of Johann monochromator is made, and several estimation formulae corresponding to various geometry conditions are given. Comparing to some other conventional formulae, the formulae given in this paper show...
A theoretical analysis for energy resolution of Johann monochromator is made, and several estimation formulae corresponding to various geometry conditions are given. Comparing to some other conventional formulae, the formulae given in this paper show...
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