2003 Vol. 27, No. 7
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Abstract:
Using Monte Carlo simulation,the process of J/ψ→γX→γηη′(η′→γρ0,ρ0→π+π-,η→γγ)is studied on BEPCⅡ/BESⅢ. Based on the better performance of BESⅢ and the large J/ψ data sample,it's possible to search for glueball state candidates and confirm their existe...
Using Monte Carlo simulation,the process of J/ψ→γX→γηη′(η′→γρ0,ρ0→π+π-,η→γγ)is studied on BEPCⅡ/BESⅢ. Based on the better performance of BESⅢ and the large J/ψ data sample,it's possible to search for glueball state candidates and confirm their existe...
Abstract:
There are many models beyond the standard model predicting the existence of non-universal gauge bosons Z′,which can give rise to very rich phenomena. We calculate the contributions of the non-universal gauge bosons Z′,predicted by topcolor-assisted t...
There are many models beyond the standard model predicting the existence of non-universal gauge bosons Z′,which can give rise to very rich phenomena. We calculate the contributions of the non-universal gauge bosons Z′,predicted by topcolor-assisted t...
Abstract:
It is shown that antiburching effect is possible in the superposition state β>+e iφβ iδ>of the generalized Coherent states of the q-deformed non-harmonic oscillator.
It is shown that antiburching effect is possible in the superposition state β>+e iφβ iδ>of the generalized Coherent states of the q-deformed non-harmonic oscillator.
Abstract:
In this paper we investigate the production of top-pion π0 t of the topcolor assisted technicolor (TC2) model with b quark pair at e+e- colliders. We find that the cross section of the process e+e－→b bπ0 t is larger than that of e+e－→b bH0 in the sta...
In this paper we investigate the production of top-pion π0 t of the topcolor assisted technicolor (TC2) model with b quark pair at e+e- colliders. We find that the cross section of the process e+e－→b bπ0 t is larger than that of e+e－→b bH0 in the sta...
Abstract:
High-spin states in odd-odd 172Re have been investigated via the 149Sm(27Al,4nγ)172Re reaction through excitation functions, X-γ and γ-γ coincidence measurements. A level scheme consisting of three rotational bands has been identified for the first t...
High-spin states in odd-odd 172Re have been investigated via the 149Sm(27Al,4nγ)172Re reaction through excitation functions, X-γ and γ-γ coincidence measurements. A level scheme consisting of three rotational bands has been identified for the first t...
Abstract:
Cross sections for (n,2n),(n,p) and (n,n′α) reactions have been measured on Gallium isotopes at the neutron energies of 13.5-14.6MeV using activation technique. The data of the cross sections are reported for the reactions of 69Ga(n,2n)68Ga,69Ga(n,p)...
Cross sections for (n,2n),(n,p) and (n,n′α) reactions have been measured on Gallium isotopes at the neutron energies of 13.5-14.6MeV using activation technique. The data of the cross sections are reported for the reactions of 69Ga(n,2n)68Ga,69Ga(n,p)...
Abstract:
Within the isospin dependent Extended Brueckner-Hartree-Fock framework,the three-body force effects on the single particle potentials of a neutron and a proton in isospin asymmetric nuclear matter and their isospin denpendence have been investigated....
Within the isospin dependent Extended Brueckner-Hartree-Fock framework,the three-body force effects on the single particle potentials of a neutron and a proton in isospin asymmetric nuclear matter and their isospin denpendence have been investigated....
Abstract:
With use of the Bonn potential, a modifed relativistivic mean field model is proposed when the effects of in-medium hadron masses are considered by the Brown-Rho scaling. Then, the model is extended to investigate the equation of state of nuclear mat...
With use of the Bonn potential, a modifed relativistivic mean field model is proposed when the effects of in-medium hadron masses are considered by the Brown-Rho scaling. Then, the model is extended to investigate the equation of state of nuclear mat...
Abstract:
How to calculate the γ-ray emission probability (absolute intensity) for isomeric transition decay is briefly introduced. The examples are given to illustrate their applications. The physical consistent checking and some discussions are also given.
How to calculate the γ-ray emission probability (absolute intensity) for isomeric transition decay is briefly introduced. The examples are given to illustrate their applications. The physical consistent checking and some discussions are also given.
Abstract:
We have carried out a study of A～50 isotopes in the framework of axially deformed relativistic mean-field theory. The ground-state properties of Ti(N22-32), Cr(N20-34) and Fe(N22-36) isotopic chains have been obtained. The separation energies of 45Cr...
We have carried out a study of A～50 isotopes in the framework of axially deformed relativistic mean-field theory. The ground-state properties of Ti(N22-32), Cr(N20-34) and Fe(N22-36) isotopic chains have been obtained. The separation energies of 45Cr...
Abstract:
Nuclear lifetime shift of charged atom, due to lack of internal conversion (isomer) or electron capture transition (β decay), is analyzed. Theoretical predict is given, that electron density of inner shell at nuclear surface decreases and energy leve...
Nuclear lifetime shift of charged atom, due to lack of internal conversion (isomer) or electron capture transition (β decay), is analyzed. Theoretical predict is given, that electron density of inner shell at nuclear surface decreases and energy leve...
Abstract:
Time-dependent fission rate is calculated numerically by simulating a set of Langevin equations. The results show that in the stationary limit the fission rate does not approach to those based on both Kramers formula with constant mass and modified K...
Time-dependent fission rate is calculated numerically by simulating a set of Langevin equations. The results show that in the stationary limit the fission rate does not approach to those based on both Kramers formula with constant mass and modified K...
Abstract:
We developed a new kind of material, which is used to construct the prototype of a large area resistive plate chamber (RPC). In this paper, the structure of RPC, the curves of efficiency, counting rate, dark current, multiple hit and signal amplitude...
We developed a new kind of material, which is used to construct the prototype of a large area resistive plate chamber (RPC). In this paper, the structure of RPC, the curves of efficiency, counting rate, dark current, multiple hit and signal amplitude...
Abstract:
A time correlated single-photon counting technique of emission time measurement for plastic scintillating fibers is given. The time response of the test system is studied and calibrated with Cherenkov radiations. The emission time properties for two ...
A time correlated single-photon counting technique of emission time measurement for plastic scintillating fibers is given. The time response of the test system is studied and calibrated with Cherenkov radiations. The emission time properties for two ...
Abstract:
The methods for calculating the electrical field strength in gas detectors have been introduced in this paper. The process to calculate the electrical field in gas detectors with complex electrode structure based on ANSYS has been presented and the e...
The methods for calculating the electrical field strength in gas detectors have been introduced in this paper. The process to calculate the electrical field in gas detectors with complex electrode structure based on ANSYS has been presented and the e...
Abstract:
A method based on the transverse particle motion equation is described for the calculation of beam acceptance for RFQ accelerators. The result is given for a four-vane type RFQ accelerator with specific structure parameters. The system acceptance for...
A method based on the transverse particle motion equation is described for the calculation of beam acceptance for RFQ accelerators. The result is given for a four-vane type RFQ accelerator with specific structure parameters. The system acceptance for...
Abstract:
The method which used the spark gap switch to sharpen the output of the modulator accelerator was presented. Through experiments on the pulse modulator accelerator, a rectangular-like waveform with voltage 500kV, pulse width 900ns, rising edge 80ns, ...
The method which used the spark gap switch to sharpen the output of the modulator accelerator was presented. Through experiments on the pulse modulator accelerator, a rectangular-like waveform with voltage 500kV, pulse width 900ns, rising edge 80ns, ...
Abstract:
The characteristic and performance of ripple feedback loop for output sub-harmonic suppression in BEPC main magnet power supply were studied, the limits of the loop effect are analysed and explained. The experimental studies on active filters to atte...
The characteristic and performance of ripple feedback loop for output sub-harmonic suppression in BEPC main magnet power supply were studied, the limits of the loop effect are analysed and explained. The experimental studies on active filters to atte...
Abstract:
For the beam transport system in storage ring, linear coupling is mainly caused by skew quadrupole and longitudinal solenoid field. It leads to emittance exchange and beam envelope augment. By using betatron motion of single particle in the presence ...
For the beam transport system in storage ring, linear coupling is mainly caused by skew quadrupole and longitudinal solenoid field. It leads to emittance exchange and beam envelope augment. By using betatron motion of single particle in the presence ...
Abstract:
With Lie algebraic methods, we analysed the nonlinear transport of particle motions in electrostatic quadrupoles up to third order. The procedures are: first, set up the Hamiltonian for the electrostatic quadrupoles, then expand the Hamiltonian into ...
With Lie algebraic methods, we analysed the nonlinear transport of particle motions in electrostatic quadrupoles up to third order. The procedures are: first, set up the Hamiltonian for the electrostatic quadrupoles, then expand the Hamiltonian into ...
Abstract:
The voids in α-Al2O3 irradiated by 85 MeV 19F ions of 5.28×1016cm－2 have been observed during the post-annealing by a positron annihilation lifetime technique for the first time. The voids start to appear at 450℃. The void radius keeps nearly constan...
The voids in α-Al2O3 irradiated by 85 MeV 19F ions of 5.28×1016cm－2 have been observed during the post-annealing by a positron annihilation lifetime technique for the first time. The voids start to appear at 450℃. The void radius keeps nearly constan...
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