2003 Vol. 27, No. 11
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Abstract:
This paper develops a method of Vector Projection (VP) , which is based on investigations and a mathematical abstraction of many methods of Pulse Shape Discrimination (PSD) used in particle identification. VP is a universal method and its optimum par...
This paper develops a method of Vector Projection (VP) , which is based on investigations and a mathematical abstraction of many methods of Pulse Shape Discrimination (PSD) used in particle identification. VP is a universal method and its optimum par...
Abstract:
The Structure of BES Ⅱ μ Detector and its original offline calibration method is introduced, The calibration method is improved after careful study of the basic principle of various offline calibration method and the main reasons which caused the z p...
The Structure of BES Ⅱ μ Detector and its original offline calibration method is introduced, The calibration method is improved after careful study of the basic principle of various offline calibration method and the main reasons which caused the z p...
Abstract:
The pion fragmentation functions are studied in the Field-Feynman recursive model with distinction of Duπ+,Ddπ+ and Dsπ+ , by taking into account the flavor structure in the excitation of the sea quark-antiquark pairs by the initial quarks. The analy...
The pion fragmentation functions are studied in the Field-Feynman recursive model with distinction of Duπ+,Ddπ+ and Dsπ+ , by taking into account the flavor structure in the excitation of the sea quark-antiquark pairs by the initial quarks. The analy...
Abstract:
Photon radiation and dilepton production induced by mutiple parton rescattering are investigated when a hard parton jet produced in relativistic high energy heavy ion collision pass through strong interaction medium. We derive the transverse momentum...
Photon radiation and dilepton production induced by mutiple parton rescattering are investigated when a hard parton jet produced in relativistic high energy heavy ion collision pass through strong interaction medium. We derive the transverse momentum...
Abstract:
Generalized q-deformation coherent states of a non-harmonic oscillator in a finite-dimensional Hilbert Space are constructed. Their amplitude-squared squeezing are discussed. The result shows that there are squeezing effects in these quantum states. ...
Generalized q-deformation coherent states of a non-harmonic oscillator in a finite-dimensional Hilbert Space are constructed. Their amplitude-squared squeezing are discussed. The result shows that there are squeezing effects in these quantum states. ...
Abstract:
The time-space structure of particles for individual air showers induced by primary γ-rays and protons at the observation level is analysed by Monte Carlo simulation. It is shown that air showers induced by the primary γ-rays can be effectively separ...
The time-space structure of particles for individual air showers induced by primary γ-rays and protons at the observation level is analysed by Monte Carlo simulation. It is shown that air showers induced by the primary γ-rays can be effectively separ...
Abstract:
Very high energy gamma rays from gamma ray bursts are explained by the expanding fireball model. The high energy gamma ray generation efficiency, the relativistic effect, and the absorption in cosmic background radiation are taken into account. It is...
Very high energy gamma rays from gamma ray bursts are explained by the expanding fireball model. The high energy gamma ray generation efficiency, the relativistic effect, and the absorption in cosmic background radiation are taken into account. It is...
Abstract:
By re-analyzing the results of the theoretical abundance of AGB stellar models and the observed abundances of 51 AGB samples, we find that the abundance distribution of heavy elements belonging to the main-component of slow neutron capture process (S...
By re-analyzing the results of the theoretical abundance of AGB stellar models and the observed abundances of 51 AGB samples, we find that the abundance distribution of heavy elements belonging to the main-component of slow neutron capture process (S...
Abstract:
High-spin states in 169Re were studied and resulted in the identification of a strongly coupled band based on the 9/2－[514] Nilsson state and a decoupled band built on the h9/2 intruder proton orbital (nominally 1/2－[541]). The cranked shell nodel ca...
High-spin states in 169Re were studied and resulted in the identification of a strongly coupled band based on the 9/2－[514] Nilsson state and a decoupled band built on the h9/2 intruder proton orbital (nominally 1/2－[541]). The cranked shell nodel ca...
Abstract:
The dependence of He and intermediate mass fragments (IMF) production rates in the reactions 55MeV/u 40Ar+58,64Ni on the isospin, impact parameter and primary excitation energy of the reaction system was studied by using the 4:v charged particle mult...
The dependence of He and intermediate mass fragments (IMF) production rates in the reactions 55MeV/u 40Ar+58,64Ni on the isospin, impact parameter and primary excitation energy of the reaction system was studied by using the 4:v charged particle mult...
Abstract:
Using different ratioes of ρs to ρb , we have calculated the in-medium kaon and antikaon effective masses which are not only dependent on the nuclear vector density ρs but also on the scalar density ρs . Based on the Walecka model and in the relativi...
Using different ratioes of ρs to ρb , we have calculated the in-medium kaon and antikaon effective masses which are not only dependent on the nuclear vector density ρs but also on the scalar density ρs . Based on the Walecka model and in the relativi...
Abstract:
Within the spin-dependent Brueckner-Hatree-Fock framework, the equation of state of the spin-polarized neutron matter has been investigated by adopting the realistic nucleon-nucleon interaction AV18 supplemented with a microscopic three-body force. T...
Within the spin-dependent Brueckner-Hatree-Fock framework, the equation of state of the spin-polarized neutron matter has been investigated by adopting the realistic nucleon-nucleon interaction AV18 supplemented with a microscopic three-body force. T...
Abstract:
The radial equation in its standard form, which can be solved by using the threepoint central difference method from central two points towards outside point by point, is reduced from Schrodinger equation or from the low energy approximation of Dirac...
The radial equation in its standard form, which can be solved by using the threepoint central difference method from central two points towards outside point by point, is reduced from Schrodinger equation or from the low energy approximation of Dirac...
Abstract:
A semiempirical expression for the excitation function for (n,p) reaction were obtained on the basis of evaporation and exciton models with the energies range up to 20 MeV. Within the nuclide of 12≤A≤209, the adjusted parameter of the semiempirical e...
A semiempirical expression for the excitation function for (n,p) reaction were obtained on the basis of evaporation and exciton models with the energies range up to 20 MeV. Within the nuclide of 12≤A≤209, the adjusted parameter of the semiempirical e...
Abstract:
This paper describes the structure of the water tank of the Cerenkov calorimeter for neutrino detection. Based on the GEANT4 Monte Carlo package, the detailed optical processes for the Cerenkov light in the water tank are simulated . Results show tha...
This paper describes the structure of the water tank of the Cerenkov calorimeter for neutrino detection. Based on the GEANT4 Monte Carlo package, the detailed optical processes for the Cerenkov light in the water tank are simulated . Results show tha...
Abstract:
Plenty of experimental studies on the effects of performances of RFC operated with different gas mixtures have been carried out. The curves of signal amplitude, multi-counting, efficiency, single counting rate and dark current versus the high voltage...
Plenty of experimental studies on the effects of performances of RFC operated with different gas mixtures have been carried out. The curves of signal amplitude, multi-counting, efficiency, single counting rate and dark current versus the high voltage...
Abstract:
A low pressure two dimensional position sensitive multiwire proportional chamber (LPMWPC) has been developed for measurements of low Z charged particles from the nuclear reaction induced by radioactive ion beam. The detector has a 50mm×50mm sensitive...
A low pressure two dimensional position sensitive multiwire proportional chamber (LPMWPC) has been developed for measurements of low Z charged particles from the nuclear reaction induced by radioactive ion beam. The detector has a 50mm×50mm sensitive...
Abstract:
RF Pulse stretcher is an antiphrasis of RF pulse compressor. It is used to convert short high power RF pulse to long low power RF pulse. The Power Extraction and Transfer Structure (PETS) in CTFⅡ(Compact Linear Collider Test Facility Phase two) can p...
RF Pulse stretcher is an antiphrasis of RF pulse compressor. It is used to convert short high power RF pulse to long low power RF pulse. The Power Extraction and Transfer Structure (PETS) in CTFⅡ(Compact Linear Collider Test Facility Phase two) can p...
Abstract:
This paper presents the development of a 1kW S-Band RF Solid State Amplifier (SSA) for the BEPC Linac. IkW peak power with a pulse width of 2-10μs under low voltage operation is achieved by combining eight 160W high power Solid State Amplifiers using...
This paper presents the development of a 1kW S-Band RF Solid State Amplifier (SSA) for the BEPC Linac. IkW peak power with a pulse width of 2-10μs under low voltage operation is achieved by combining eight 160W high power Solid State Amplifiers using...
Abstract:
The structural parameters in a semicrystalline polymer three-phase system have been evaluated using small angle X-ray scattering technique. The crystallinity and the lamellar thickness are not consistent with those in two-phase system. The analysis o...
The structural parameters in a semicrystalline polymer three-phase system have been evaluated using small angle X-ray scattering technique. The crystallinity and the lamellar thickness are not consistent with those in two-phase system. The analysis o...
Abstract:
Longgang volcanic swarm belongs to one of volcanic areas which have been active since modern times. In view of multiple eruptions during histories, it is very important to determine age of every eruption for evaluating volcanic hazards. The alkaline ...
Longgang volcanic swarm belongs to one of volcanic areas which have been active since modern times. In view of multiple eruptions during histories, it is very important to determine age of every eruption for evaluating volcanic hazards. The alkaline ...
Abstract:
New measurements of R value in the energy range of 2-5GeV were completed by Beijing Spectrometer Collaboration (BES) at Beijing Electron Positron Collider (BEPC) and caused a strong impact on the search for new physics and Higgs particle in the inter...
New measurements of R value in the energy range of 2-5GeV were completed by Beijing Spectrometer Collaboration (BES) at Beijing Electron Positron Collider (BEPC) and caused a strong impact on the search for new physics and Higgs particle in the inter...
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