2006 Vol. 30, No. 5
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Abstract:
An Object-Oriented Monte Carlo program BOOST based on Geant4 toolkit has been developed for BESⅢ detector simulation. It describes the full BESⅢ detector geometry and records hit information in sub-detectors. BOOST outputs raw data and MC truth infor...
An Object-Oriented Monte Carlo program BOOST based on Geant4 toolkit has been developed for BESⅢ detector simulation. It describes the full BESⅢ detector geometry and records hit information in sub-detectors. BOOST outputs raw data and MC truth infor...
Abstract:
Using Monte Carlo simulation, reconstruction of photon conversions is studied, and the detection efficiency and energy resolution as a function of photon energy are obtained.The dE/dx correction for the electrons from photon conversions and the energ...
Using Monte Carlo simulation, reconstruction of photon conversions is studied, and the detection efficiency and energy resolution as a function of photon energy are obtained.The dE/dx correction for the electrons from photon conversions and the energ...
Abstract:
Space coordinates may become noncommutative near the string scale. In this paper, we give a representation of the noncommutative coordinates and noncommutative momenta. We then apply this representation to compute the eigen energy splitting of the is...
Space coordinates may become noncommutative near the string scale. In this paper, we give a representation of the noncommutative coordinates and noncommutative momenta. We then apply this representation to compute the eigen energy splitting of the is...
Abstract:
The imaging test setup for the Hard X-ray Modulation Telescope (HXMT) mission was built to give verification of detector performance and the imaging properties of HXMT. It consists of 18 slat-collimated NaI(Tl)/CsI(Na) phoswich detectors with a total...
The imaging test setup for the Hard X-ray Modulation Telescope (HXMT) mission was built to give verification of detector performance and the imaging properties of HXMT. It consists of 18 slat-collimated NaI(Tl)/CsI(Na) phoswich detectors with a total...
Abstract:
The scaled factorial moments of slow particles produced in 16O-Em at 3.7A GeV have been calculated. It is obtained that the intermittency exponent increases with increasing moment order and decreases with increasing target mass, the anomalous fractal...
The scaled factorial moments of slow particles produced in 16O-Em at 3.7A GeV have been calculated. It is obtained that the intermittency exponent increases with increasing moment order and decreases with increasing target mass, the anomalous fractal...
Abstract:
High-spin Level structure of 188Tl has been studied via 157Gd(35Cl,4n) fusion-evaporation reaction at beam energy of 170MeV. A rotational band built on the πh9/2×υi13/2 configuration with oblate deformation has been established. Spin values have been...
High-spin Level structure of 188Tl has been studied via 157Gd(35Cl,4n) fusion-evaporation reaction at beam energy of 170MeV. A rotational band built on the πh9/2×υi13/2 configuration with oblate deformation has been established. Spin values have been...
Abstract:
The mass of Θ+ in the qq-q-qq configuration is calculated by using a potential composed by a Coulomb potential originated from the One Gluon Exchange (OGE) and a double Y-mode confining potential extracted from the flux tube model. It is shown that t...
The mass of Θ+ in the qq-q-qq configuration is calculated by using a potential composed by a Coulomb potential originated from the One Gluon Exchange (OGE) and a double Y-mode confining potential extracted from the flux tube model. It is shown that t...
Abstract:
The effects of iso-scalar ω tensor coupling on spin-orbit splittings are studied in the framework of the Relativistic Mean Field theory. Taking 208Pb as an example, the influence of iso-scalar ω tensor coupling on nuclear mean-field potentials, σ-, ω...
The effects of iso-scalar ω tensor coupling on spin-orbit splittings are studied in the framework of the Relativistic Mean Field theory. Taking 208Pb as an example, the influence of iso-scalar ω tensor coupling on nuclear mean-field potentials, σ-, ω...
Abstract:
In the deeply inelastic e-A scattering, the gluon radiation induced by multiple scattering will lead to medium modification of the parton fragmentation functions and also associate with the energy loss of the leading quark. To obtain the hard partoni...
In the deeply inelastic e-A scattering, the gluon radiation induced by multiple scattering will lead to medium modification of the parton fragmentation functions and also associate with the energy loss of the leading quark. To obtain the hard partoni...
Abstract:
The effect of deformation on pre-scission particle emission of three heavy isobaric systems, 200Ag, 200Tl, 200Bi, and light isobaric systems, 110Pd, 110In, 110Te, are investigated by the combined dynamical statistical model and the statistical models...
The effect of deformation on pre-scission particle emission of three heavy isobaric systems, 200Ag, 200Tl, 200Bi, and light isobaric systems, 110Pd, 110In, 110Te, are investigated by the combined dynamical statistical model and the statistical models...
Abstract:
By means of the improved quantum molecular dynamics model, the incident energy dependent dynamical fusion potential barriers for heavy nucleus reaction systems are investigated. It is found that with decrease of incident energy the lowest dynamic bar...
By means of the improved quantum molecular dynamics model, the incident energy dependent dynamical fusion potential barriers for heavy nucleus reaction systems are investigated. It is found that with decrease of incident energy the lowest dynamic bar...
Abstract:
In virtue of the simple physical picture of quark combination model, we determine the dependence of anti-particle to particle ratios on the mean production probability of anti-quarks and quarks. The ratios of various anti-particle to particle at rela...
In virtue of the simple physical picture of quark combination model, we determine the dependence of anti-particle to particle ratios on the mean production probability of anti-quarks and quarks. The ratios of various anti-particle to particle at rela...
Abstract:
We present the results of an aging test on two six-gap multi-gap resistive plate chambers (MRPC) designed for the RHIC-STAR TOF system. The test was carried out with a 100mCi 60Co γ ray source. MRPCs were irradiated by different dose rates of the sou...
We present the results of an aging test on two six-gap multi-gap resistive plate chambers (MRPC) designed for the RHIC-STAR TOF system. The test was carried out with a 100mCi 60Co γ ray source. MRPCs were irradiated by different dose rates of the sou...
Abstract:
The Endcap TOF (ETOF) of Beijing Spectrometer(BESⅢ) is consisted of 2×48 pieces of trapezoidal scintillator. Its main physics goal is to realize 2σ π/k separation at momentum up to 0.8GeV/c, and to reach the intrinsic time resolution of 80ps. In this...
The Endcap TOF (ETOF) of Beijing Spectrometer(BESⅢ) is consisted of 2×48 pieces of trapezoidal scintillator. Its main physics goal is to realize 2σ π/k separation at momentum up to 0.8GeV/c, and to reach the intrinsic time resolution of 80ps. In this...
Abstract:
Motivation of the Touschek backgrounds study is introduced. Also introduced are the theory and modeling methods of the Touschek effect. The Touschek backgrounds of the main detectors of the BESⅢ are studied in detail using the self-reprogrammed gener...
Motivation of the Touschek backgrounds study is introduced. Also introduced are the theory and modeling methods of the Touschek effect. The Touschek backgrounds of the main detectors of the BESⅢ are studied in detail using the self-reprogrammed gener...
Abstract:
In modern high energy accelerators, with the increase of charge in a bunch or a bunch train, the induced transient beam loading voltages become higher and higher when the beams pass through the standing wave cavities. But in the usual analysis, peopl...
In modern high energy accelerators, with the increase of charge in a bunch or a bunch train, the induced transient beam loading voltages become higher and higher when the beams pass through the standing wave cavities. But in the usual analysis, peopl...
Abstract:
The principle of particle coupling between horizontal and vertical directions in solenoid is presented. Further more, the method of decoupling can be obtained by using the coupling dynamic equations. 5000 particles are tracked under three conditions:...
The principle of particle coupling between horizontal and vertical directions in solenoid is presented. Further more, the method of decoupling can be obtained by using the coupling dynamic equations. 5000 particles are tracked under three conditions:...
Abstract:
The new electron gun system for the BEPCⅡ was tested on the test bench in July, 2004, and has been put into operation since Nov. 2004. This article describes the experiment results and operation status of this new system. The design current of the gu...
The new electron gun system for the BEPCⅡ was tested on the test bench in July, 2004, and has been put into operation since Nov. 2004. This article describes the experiment results and operation status of this new system. The design current of the gu...
Abstract:
This paper is involved in multi-pulsed emission characteristics of some cathodes while generating intensive relativistic electron beams. Research results indicate that the velvet, the carbon fiber and the dispenser cathode all have the ability to gen...
This paper is involved in multi-pulsed emission characteristics of some cathodes while generating intensive relativistic electron beams. Research results indicate that the velvet, the carbon fiber and the dispenser cathode all have the ability to gen...
Abstract:
The interface effect of semiconductor InSb nanoparticles (NPs) embedded in a-SiO2 matrix was investigated via multi-scattering XANES simulations. The results show that the white line increase and broadening to higher energies of InSb NPs embedded in ...
The interface effect of semiconductor InSb nanoparticles (NPs) embedded in a-SiO2 matrix was investigated via multi-scattering XANES simulations. The results show that the white line increase and broadening to higher energies of InSb NPs embedded in ...
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