2003 Vol. 27, No. 8
Display Method: |
Abstract:
A data quality monitoring system for fast reconstructed event is depicted in detail for ψ(2S)data taking during 2001-2002 years' running at Beijing Spectrometer(BES Ⅱ) . In parallel with fast reconstruction of raw data, the performance and stability ...
A data quality monitoring system for fast reconstructed event is depicted in detail for ψ(2S)data taking during 2001-2002 years' running at Beijing Spectrometer(BES Ⅱ) . In parallel with fast reconstruction of raw data, the performance and stability ...
Abstract:
Based on three methods of particle identification (PID) of BES,we study the identification of p and p in momentum range from 0.3 to 1.2 GeV using real particle samples of e,μ,π,K,p and p which were collected in 2-5GeV R scan,J/(ψ) and ψ′ data taking ...
Based on three methods of particle identification (PID) of BES,we study the identification of p and p in momentum range from 0.3 to 1.2 GeV using real particle samples of e,μ,π,K,p and p which were collected in 2-5GeV R scan,J/(ψ) and ψ′ data taking ...
Abstract:
We employ one-particle-exchange method to study D→PV decays in D→Kρ,πK , π processes. Taking a strong phase into account and considering nonfactorizable effect, we can get good results consistent with the experimental data. Nonfactorizable effect is ...
We employ one-particle-exchange method to study D→PV decays in D→Kρ,πK , π processes. Taking a strong phase into account and considering nonfactorizable effect, we can get good results consistent with the experimental data. Nonfactorizable effect is ...
Abstract:
Based on the perturbative QCD predictions of gluonic distributions and branch cross section of the J/ψ decay via hadronic, electromagnetic,and radiative channels, the strict solutions of LUND area law of string fragmentation had-ronization are used t...
Based on the perturbative QCD predictions of gluonic distributions and branch cross section of the J/ψ decay via hadronic, electromagnetic,and radiative channels, the strict solutions of LUND area law of string fragmentation had-ronization are used t...
Abstract:
We analyze the B→KK decays with the soft-gluon corrections by using the QCD light-cone sum rules(LCSR) .Although one can calculate the leading order factorization parts and the radiative corrections from hard-gluon exchanges at a, order in QCD factor...
We analyze the B→KK decays with the soft-gluon corrections by using the QCD light-cone sum rules(LCSR) .Although one can calculate the leading order factorization parts and the radiative corrections from hard-gluon exchanges at a, order in QCD factor...
Abstract:
Using the Bonn potential plus the BR scaling parameter induced by in-medium effects,the modified relativistic mean field model proposed recently is applied to investigate the properties of neutron star. The obtained results show that the BR scaling p...
Using the Bonn potential plus the BR scaling parameter induced by in-medium effects,the modified relativistic mean field model proposed recently is applied to investigate the properties of neutron star. The obtained results show that the BR scaling p...
Abstract:
Through measuring high-fold prompt γ- ray coincidence events following the spontaneous fission of 252 Cf with the Gammasphere detector array, new level scheme in the very neutron-rich odd-A 113Ru nucleus has been established. An intruder collective b...
Through measuring high-fold prompt γ- ray coincidence events following the spontaneous fission of 252 Cf with the Gammasphere detector array, new level scheme in the very neutron-rich odd-A 113Ru nucleus has been established. An intruder collective b...
Abstract:
Due to the contributions of the quantum vacuum to densities, the relativistic Hartree approach for finite nuclei produces a large effective nucleon mass m IMN≈0.8, which causes the spin-orbit force to be only 1/3 of the empirical value. In this work ...
Due to the contributions of the quantum vacuum to densities, the relativistic Hartree approach for finite nuclei produces a large effective nucleon mass m IMN≈0.8, which causes the spin-orbit force to be only 1/3 of the empirical value. In this work ...
Abstract:
A similar method to the H-F method for particles is developed to determine the structure of the pairs. A scheme for dealing with the problem caused by the seniority mixing is also proposed. In this scheme the independent D pairs are constructed by th...
A similar method to the H-F method for particles is developed to determine the structure of the pairs. A scheme for dealing with the problem caused by the seniority mixing is also proposed. In this scheme the independent D pairs are constructed by th...
Abstract:
The σR and σ－2n have been calculated via the BUU model by using soft EOS and 0.8σCug. The density distribution which come from RMF model has been introduced to replace the normal used square-type distributions in BUU calculation. The calculated resul...
The σR and σ－2n have been calculated via the BUU model by using soft EOS and 0.8σCug. The density distribution which come from RMF model has been introduced to replace the normal used square-type distributions in BUU calculation. The calculated resul...
Abstract:
The ground state properties of the odd-even nuclei with proton number Z=103-109 have been systematically calculated in the deformed relativistic mean-field (RMF) theory with two sets of force parameters, NL-Z2 and TMA. When comparing the calculated b...
The ground state properties of the odd-even nuclei with proton number Z=103-109 have been systematically calculated in the deformed relativistic mean-field (RMF) theory with two sets of force parameters, NL-Z2 and TMA. When comparing the calculated b...
Abstract:
A model simulating the main aspects of avalanche growth and signal development in Resistive Plate Chambers (RPCs) is presented. The model has been used to compute the charge distribution and time distribution of Multi-gap RPCs. The comparison between...
A model simulating the main aspects of avalanche growth and signal development in Resistive Plate Chambers (RPCs) is presented. The model has been used to compute the charge distribution and time distribution of Multi-gap RPCs. The comparison between...
Abstract:
The BESll Muon Counter(MUC) performance is carefully studied. The MUC cluster positions and the magnetic fields in the coil and iron york of BESⅡ are calibrated by dimuon events collected at J/ψ and ψ(2S)peak energies. With these calibration constant...
The BESll Muon Counter(MUC) performance is carefully studied. The MUC cluster positions and the magnetic fields in the coil and iron york of BESⅡ are calibrated by dimuon events collected at J/ψ and ψ(2S)peak energies. With these calibration constant...
Abstract:
In electron storage ring, the distortion of closed orbit and dispersion, due to inaccuracies of magnets manufacture and misalignment, will cause a series of negative effects, such as tune-shift, distortion of optic function, decrease of dynamic apert...
In electron storage ring, the distortion of closed orbit and dispersion, due to inaccuracies of magnets manufacture and misalignment, will cause a series of negative effects, such as tune-shift, distortion of optic function, decrease of dynamic apert...
Abstract:
Electron cooling device for HIRFL-CSR main ring has been completed under the cooperation between BINP and IMP. It has three distinctive characters. Variable profile electron beam can be produced by the electron gun, the size and density distribution ...
Electron cooling device for HIRFL-CSR main ring has been completed under the cooperation between BINP and IMP. It has three distinctive characters. Variable profile electron beam can be produced by the electron gun, the size and density distribution ...
Abstract:
With construction of CSR and acceleration of proton at HIRFL, the existing beam handling system can not meet the requirements of nuclear physics experiments for more and more beam time. For this reason, a new beam distribution system based on time is...
With construction of CSR and acceleration of proton at HIRFL, the existing beam handling system can not meet the requirements of nuclear physics experiments for more and more beam time. For this reason, a new beam distribution system based on time is...
Abstract:
Higher-order modes (HOM's) excited in the Superconducting Cavity (SCC) can be damped through many ways. Microwave absorbers, HOM' s couplers, coaxial waveguides and other devices are used to achieve this aim. The recent status of the R&D on an 800MHz...
Higher-order modes (HOM's) excited in the Superconducting Cavity (SCC) can be damped through many ways. Microwave absorbers, HOM' s couplers, coaxial waveguides and other devices are used to achieve this aim. The recent status of the R&D on an 800MHz...
Abstract:
Si/Ge superlattices were grown at low temperature with modified Stranski-Krastanov (SK) MBE method. X-ray specular, off-specular reflectivity, and X-ray transverse scattering measurements were done to characterize the structure of the Ge/Si superlat-...
Si/Ge superlattices were grown at low temperature with modified Stranski-Krastanov (SK) MBE method. X-ray specular, off-specular reflectivity, and X-ray transverse scattering measurements were done to characterize the structure of the Ge/Si superlat-...
Abstract:
The method of bending capillaries to limit higher energy X-ray is a possible way to select X-ray energy. Calculation and measurement using synchrotron radiation source indicated that the transmission efficiency of X-ray in "water window" through capi...
The method of bending capillaries to limit higher energy X-ray is a possible way to select X-ray energy. Calculation and measurement using synchrotron radiation source indicated that the transmission efficiency of X-ray in "water window" through capi...
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