2004 Vol. 28, No. 5
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Abstract:
Light particle emission at around 107°and 128°in the reaction induced by 25MeV/u 6He from 9Be target were clearly observed. The shape of the energy spectra obtained is consistent with an equilibrium evaporation from a source with a temperature of 5.6...
Light particle emission at around 107°and 128°in the reaction induced by 25MeV/u 6He from 9Be target were clearly observed. The shape of the energy spectra obtained is consistent with an equilibrium evaporation from a source with a temperature of 5.6...
Abstract:
On the basis of the study of inclusive hadronic events, two methods are adopted to determine the number of produced ψ(2S) events collected by BES in 2001—2002 run, which is 14.0×106 with the uncertainty of 4%.
On the basis of the study of inclusive hadronic events, two methods are adopted to determine the number of produced ψ(2S) events collected by BES in 2001—2002 run, which is 14.0×106 with the uncertainty of 4%.
Abstract:
The mass splitting of K*(892)± and K*(892)0 is studied through J/ψ→K±K*(892) and J/ψ→K0*892)0 at EBPCⅡ/BESⅢ. The Geant3-based Monte-Carlo simulation shows that the K*(892) mass splitting can be precisely measured at BESⅢ. If the mass splitting is 600...
The mass splitting of K*(892)± and K*(892)0 is studied through J/ψ→K±K*(892) and J/ψ→K0*892)0 at EBPCⅡ/BESⅢ. The Geant3-based Monte-Carlo simulation shows that the K*(892) mass splitting can be precisely measured at BESⅢ. If the mass splitting is 600...
Abstract:
The 3-jet events from hadronic Z0 decay is studied using Monte-Carlo simulation. Quark and Gluon jets are identified through the b-tag method. A new physical quantity——hardness is defined, and the hardness distributions of quark and gluon jets are ca...
The 3-jet events from hadronic Z0 decay is studied using Monte-Carlo simulation. Quark and Gluon jets are identified through the b-tag method. A new physical quantity——hardness is defined, and the hardness distributions of quark and gluon jets are ca...
Abstract:
We study the lepton flavor violating (LFV) processes l-i→l-jν-l-l in the context of the topcolor-assisted technicolor (TC2) models. We find that the branching ratios Br(τ→l-jν-τ-τ) are larger than the branching ratios Br(τ→l-jν-l-l) in all of the par...
We study the lepton flavor violating (LFV) processes l-i→l-jν-l-l in the context of the topcolor-assisted technicolor (TC2) models. We find that the branching ratios Br(τ→l-jν-τ-τ) are larger than the branching ratios Br(τ→l-jν-l-l) in all of the par...
Abstract:
With helicity partial wave analysis formalism, we discuss how one can distinguish f-0 resonance from f2 resonance in the process of J/ψ→fJ(θ1,1) with fJ→ππ(θ2, 2) and →K(θ3, 3) by various projections of angular distributions. We find that f-0 and f...
With helicity partial wave analysis formalism, we discuss how one can distinguish f-0 resonance from f2 resonance in the process of J/ψ→fJ(θ1,1) with fJ→ππ(θ2, 2) and →K(θ3, 3) by various projections of angular distributions. We find that f-0 and f...
Abstract:
The coupled cluster method is improved with the random phase approximation (RPA) to calculate vacuum wave function and vacuum energy of 2+1-D SU(2) lattice gauge theory. In this calculating, the trial wave function composes of single-hollow graphs. T...
The coupled cluster method is improved with the random phase approximation (RPA) to calculate vacuum wave function and vacuum energy of 2+1-D SU(2) lattice gauge theory. In this calculating, the trial wave function composes of single-hollow graphs. T...
Abstract:
High-spin states of 126Cs have been populated via the 116Cd(14N,4n) 126Cs reaction. The experiment was performed at Niels Bohr Institute in Denmark in 1991. After careful data analysis, most of the previously-known bands have been pushed up to much h...
High-spin states of 126Cs have been populated via the 116Cd(14N,4n) 126Cs reaction. The experiment was performed at Niels Bohr Institute in Denmark in 1991. After careful data analysis, most of the previously-known bands have been pushed up to much h...
Abstract:
High spin states of 135La have been experimentally studied by using 128Te(10B, 3n) 135La reaction at 46 MeV beam energy. Based on the γ-γ coincidence relationships, relative intensities and ADO ratios, a level scheme of 135La has been established. Bo...
High spin states of 135La have been experimentally studied by using 128Te(10B, 3n) 135La reaction at 46 MeV beam energy. Based on the γ-γ coincidence relationships, relative intensities and ADO ratios, a level scheme of 135La has been established. Bo...
Abstract:
The α-cluster model is extended to study the unfavored α-decay lifetimes around a closed shell. The newly discovered α-decay of 209Bi [Marcillac et al., Nature (London) 422, 2003: 876] and a odd-A N=127 isotones are investigated by the α-cluster mode...
The α-cluster model is extended to study the unfavored α-decay lifetimes around a closed shell. The newly discovered α-decay of 209Bi [Marcillac et al., Nature (London) 422, 2003: 876] and a odd-A N=127 isotones are investigated by the α-cluster mode...
Abstract:
It is introduced briefly to calculate normalization factor for absolute intensities of gamma-rays arrising from β－ decay. The examples are given to illustrate their application. The intensity balance check and some discussion are also given in text.
It is introduced briefly to calculate normalization factor for absolute intensities of gamma-rays arrising from β－ decay. The examples are given to illustrate their application. The intensity balance check and some discussion are also given in text.
Abstract:
Based on experimental data of total, nonelastic, elastic cross section and elastic scattering angular distribu-tions for n+Cr reactions, a set of neutron optical model potential parameters is obtained in the region of incident neutron energy from 1 t...
Based on experimental data of total, nonelastic, elastic cross section and elastic scattering angular distribu-tions for n+Cr reactions, a set of neutron optical model potential parameters is obtained in the region of incident neutron energy from 1 t...
Abstract:
The variation of the quadrupole deformations β of the ground state even-even nuclei with A≥100 are investigated systematically. The studied nuclei are classified into different groups not only by their mass numbers but also by if the valence nucleons...
The variation of the quadrupole deformations β of the ground state even-even nuclei with A≥100 are investigated systematically. The studied nuclei are classified into different groups not only by their mass numbers but also by if the valence nucleons...
Abstract:
It was studied to calibrate a lead scintillating fiber sandwiched electromagnetic calorimeter using proton and electron beams. The calibration constants from proton and muon were compared. After attenuation correction, the proton constants were used ...
It was studied to calibrate a lead scintillating fiber sandwiched electromagnetic calorimeter using proton and electron beams. The calibration constants from proton and muon were compared. After attenuation correction, the proton constants were used ...
Abstract:
The research and development of a new type detector for solar neutrino detection is introduced. The detector uses two types of scintillators: one is the gadolinium(Gd) loaded liquid scintillator with the concentration of 5%, for which the light atten...
The research and development of a new type detector for solar neutrino detection is introduced. The detector uses two types of scintillators: one is the gadolinium(Gd) loaded liquid scintillator with the concentration of 5%, for which the light atten...
Abstract:
A simple cosmic ray stand for testing sampling scintillating fiber calorimeter module has been constructed. The measurement and analyses method is reported. A module of sampling scintillating fiber calorimeter from KLOE (INFN, Italy) is tested by usi...
A simple cosmic ray stand for testing sampling scintillating fiber calorimeter module has been constructed. The measurement and analyses method is reported. A module of sampling scintillating fiber calorimeter from KLOE (INFN, Italy) is tested by usi...
Abstract:
In order to get a beam spot with limited dimension and symmetrical distribution on the target, the required parameters of the beam transport system are discussed. The related formulas to determine these parameters for different initial conditions are...
In order to get a beam spot with limited dimension and symmetrical distribution on the target, the required parameters of the beam transport system are discussed. The related formulas to determine these parameters for different initial conditions are...
Abstract:
In electron storage rings, interactions by beams with residual gas produce the bremsstrahlung and it is one of the main sources of the beam loss. We analyze the bremsstrahlung and calculate the dose rate in the linear section of the storage rings. Th...
In electron storage rings, interactions by beams with residual gas produce the bremsstrahlung and it is one of the main sources of the beam loss. We analyze the bremsstrahlung and calculate the dose rate in the linear section of the storage rings. Th...
Abstract:
In this paper, the turn-by-turn system of Hefei Light Source (HLS), and the log-ratio electronics circuit with working frequence 408MHz (2*RF of HLS) are described. They are used to monitor the injection effectiveness, damping rate, β oscillation and...
In this paper, the turn-by-turn system of Hefei Light Source (HLS), and the log-ratio electronics circuit with working frequence 408MHz (2*RF of HLS) are described. They are used to monitor the injection effectiveness, damping rate, β oscillation and...
Abstract:
The BEPCⅡ future pre-injector consists of a thermionic gun followed by two subharmonic bunchers (SHB), a travelling wave prebuncher and a travelling wave buncher. All components downstream of the gun are immersed in a solenoid field for transverse fo...
The BEPCⅡ future pre-injector consists of a thermionic gun followed by two subharmonic bunchers (SHB), a travelling wave prebuncher and a travelling wave buncher. All components downstream of the gun are immersed in a solenoid field for transverse fo...
Abstract:
When the bunch goes through a chicane, the energy will be redistributed within the bunch due to CSR (coherent synchrotron radiation), which would cause nonlinearity. Present theory states that this nonlinearity would add a huge amount to emittance gr...
When the bunch goes through a chicane, the energy will be redistributed within the bunch due to CSR (coherent synchrotron radiation), which would cause nonlinearity. Present theory states that this nonlinearity would add a huge amount to emittance gr...
Abstract:
A slow positron beam with intensity of 106e+/s produced by the Beijing Electron-Positron Collider (BEPC) is transported by the 100 Gauss magnetic field system with the oscillation less than 10. In this paper, the distributions of magnetic field at ta...
A slow positron beam with intensity of 106e+/s produced by the Beijing Electron-Positron Collider (BEPC) is transported by the 100 Gauss magnetic field system with the oscillation less than 10. In this paper, the distributions of magnetic field at ta...
Abstract:
The radiation destructive appeatance caused by intensive electron beam current with 12MeV energy reveals different mechanism of fracture from those caused by lower energy electron or X-ray due to the strong penetrating ability of the electron. In the...
The radiation destructive appeatance caused by intensive electron beam current with 12MeV energy reveals different mechanism of fracture from those caused by lower energy electron or X-ray due to the strong penetrating ability of the electron. In the...
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