1990 Vol. 14, No. 2
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Abstract:
The trapping process of positrons into vacancies and small vacancy clusters is described by a Three State Model.The experimental results of negative temperature dependence of specific trapping rate are explained theoretically.
The trapping process of positrons into vacancies and small vacancy clusters is described by a Three State Model.The experimental results of negative temperature dependence of specific trapping rate are explained theoretically.
Abstract:
By analysing the cosmic ray data of μ-counter array in BES,we obtained informations on the threshold for identifying signal and noise,the detection efficiency of single wire layer,the particle detection efficiency,and the location resolutions in z direction and in γ-φ plane for μ-counter array.The comparison between eexperimental data and Monte-Carlo simulation showed good agreement.
By analysing the cosmic ray data of μ-counter array in BES,we obtained informations on the threshold for identifying signal and noise,the detection efficiency of single wire layer,the particle detection efficiency,and the location resolutions in z direction and in γ-φ plane for μ-counter array.The comparison between eexperimental data and Monte-Carlo simulation showed good agreement.
Abstract:
Based on Monte-Carlo simulation and particle tracking,the positron source of BEPC is designed and the predicted performance is compared with experimental measurement with good agreement.Important conclusions can be drawn from the study presented in this paper,such as up to 10A increase in electron gun current is beneficial in spite of the deterioration effect on the beam spot size at the target; positron current increase with the bridge coil and solenoid currents of the positron of matching field peak to the target; the existance of the injection phased and their significance; the electron and positron from the target do not have to be separated and the R.F. separator is not necessary etc.The above results serve the purpose of directing the tune-up and operation of BEPC,providing a useful reference for future design of positron accelerators.
Based on Monte-Carlo simulation and particle tracking,the positron source of BEPC is designed and the predicted performance is compared with experimental measurement with good agreement.Important conclusions can be drawn from the study presented in this paper,such as up to 10A increase in electron gun current is beneficial in spite of the deterioration effect on the beam spot size at the target; positron current increase with the bridge coil and solenoid currents of the positron of matching field peak to the target; the existance of the injection phased and their significance; the electron and positron from the target do not have to be separated and the R.F. separator is not necessary etc.The above results serve the purpose of directing the tune-up and operation of BEPC,providing a useful reference for future design of positron accelerators.
Abstract:
By considering the one-loop radiative corrections,we discussed the symmetry breaking of a specific superstringinspired model based on the gauge group SU(3)C×SU(2)L×SU(2)R×U(1)′×U(1)′′ We discussed phenomenologically the neutrino mass problem,and the value of the soft breaking parameters A,m and M at the scale Mx were given.
By considering the one-loop radiative corrections,we discussed the symmetry breaking of a specific superstringinspired model based on the gauge group SU(3)C×SU(2)L×SU(2)R×U(1)′×U(1)′′ We discussed phenomenologically the neutrino mass problem,and the value of the soft breaking parameters A,m and M at the scale Mx were given.
Abstract:
The differential realization of Lie superalgebra B(0,1) on the space of inhomogeneous polynomials,and the corresponding inhomogeneous Boson-Fermion realization are studiel.A new kind of indecomposable and irreducible representations of Lie superalgebra B(0,1) is studied on the universal enveloping algebra of Heisenberg-Weyl superalgebra,and on its subspaces and quotient spaces.All the finite dimensional irreducible representations are naturally obtained as special cases.
The differential realization of Lie superalgebra B(0,1) on the space of inhomogeneous polynomials,and the corresponding inhomogeneous Boson-Fermion realization are studiel.A new kind of indecomposable and irreducible representations of Lie superalgebra B(0,1) is studied on the universal enveloping algebra of Heisenberg-Weyl superalgebra,and on its subspaces and quotient spaces.All the finite dimensional irreducible representations are naturally obtained as special cases.
Abstract:
Under non-relativistic conditions,the properties of adiabatic solutions of the Schrodinger equation in moving frame of reference and the behaviours of the corresponding Berry's Phase are analysed.Two cases of translation and rotation are discussed in detail,which show that the existence of Berry's phase depends on the choice of frame of reference.While Bitter and Dubbers's experiment is explained by the first-order approximation in our discussion,the nonadiabatic effects in this experiment are predicted by the second-order approximation when the adiabatic condition is broken.
Under non-relativistic conditions,the properties of adiabatic solutions of the Schrodinger equation in moving frame of reference and the behaviours of the corresponding Berry's Phase are analysed.Two cases of translation and rotation are discussed in detail,which show that the existence of Berry's phase depends on the choice of frame of reference.While Bitter and Dubbers's experiment is explained by the first-order approximation in our discussion,the nonadiabatic effects in this experiment are predicted by the second-order approximation when the adiabatic condition is broken.
Abstract:
The even and odd multiplicity distributions for hadron-hadron collision in different rapidity windows are calculated,starting from a simple picture for charge correlation with nonzero correlation length.The coincidence and separation of these distributions are explained.The calculated window-and energy-dependence of normalized moments recover the behaviour found in experiments.A new definition for normalized moments is propossed,especially suitable for narrow rapidity windows.
The even and odd multiplicity distributions for hadron-hadron collision in different rapidity windows are calculated,starting from a simple picture for charge correlation with nonzero correlation length.The coincidence and separation of these distributions are explained.The calculated window-and energy-dependence of normalized moments recover the behaviour found in experiments.A new definition for normalized moments is propossed,especially suitable for narrow rapidity windows.
Abstract:
A 1+1-dimensional U(1+1) gauge theory is proposed and the exact solution of its spectrum and corresponding energy eigenstates is found.
A 1+1-dimensional U(1+1) gauge theory is proposed and the exact solution of its spectrum and corresponding energy eigenstates is found.
Abstract:
In this paper,we analyse the spatial overlapping behavior of sea quarks of neighboring nucleons in nuclei in the small x region and give a relation between the nuclear shadowing factor R(x,Q2,A) and the spatial overlapping factor ΔVA(x)/VA(x).By using this nuclear shadowing factor R(x,Q2,A),we calculate the ratios of the average nuclear structure functions of nuclei 12C、63Cu and 116Sn,to the deuteron structure function and obtais a better agreement between the calculated result and the experimental data.
In this paper,we analyse the spatial overlapping behavior of sea quarks of neighboring nucleons in nuclei in the small x region and give a relation between the nuclear shadowing factor R(x,Q2,A) and the spatial overlapping factor ΔVA(x)/VA(x).By using this nuclear shadowing factor R(x,Q2,A),we calculate the ratios of the average nuclear structure functions of nuclei 12C、63Cu and 116Sn,to the deuteron structure function and obtais a better agreement between the calculated result and the experimental data.
Abstract:
The expressions of fermion operators in the interacting boson-fermion models including the g-boson have been derived in this short communication.
The expressions of fermion operators in the interacting boson-fermion models including the g-boson have been derived in this short communication.
Abstract:
In the IBM4,when s.d.g bosons are presented,the symmetry group of the system is U(90) In this paper,the group chain.U90 U15(sdg)×U6(ST) SU15(sdg)×U6(ST) SU5(sdg)× O6(ST) SO5(dg)×O3(S)×O3(T) O3(dg)×O3(S)×O3(T) O3(J)×O3(T) is discussed,the reduction rules and the typical energy spectra are obtained.An example of a spectrum with this dynamical symmetry is found out,where the even-even nucleus 34S and odd-odd nucleus 34Cl are in one multiplet.
In the IBM4,when s.d.g bosons are presented,the symmetry group of the system is U(90) In this paper,the group chain.U90 U15(sdg)×U6(ST) SU15(sdg)×U6(ST) SU5(sdg)× O6(ST) SO5(dg)×O3(S)×O3(T) O3(dg)×O3(S)×O3(T) O3(J)×O3(T) is discussed,the reduction rules and the typical energy spectra are obtained.An example of a spectrum with this dynamical symmetry is found out,where the even-even nucleus 34S and odd-odd nucleus 34Cl are in one multiplet.
Abstract:
A method without iterative procedure is presented for resolution of a three-component decay curve with a decay constant being known.Artificial decay data have been used to test the present method and good results have been obtained.
A method without iterative procedure is presented for resolution of a three-component decay curve with a decay constant being known.Artificial decay data have been used to test the present method and good results have been obtained.
Abstract:
Nuclear shapes in fission process have been described by using a generalized Cassinian ovals.The calculated fission barriers and effective moments of inertia of saddle-point configurations are in good agreement with the experimental data.The calculated fission barriers for a wide range of nuclei as a function of angular momentum are close to the prelicted values by the CPS Model based on describing nuclear shapes in terms of a spherical harmonic expansion with lowest nine even order terms.
Nuclear shapes in fission process have been described by using a generalized Cassinian ovals.The calculated fission barriers and effective moments of inertia of saddle-point configurations are in good agreement with the experimental data.The calculated fission barriers for a wide range of nuclei as a function of angular momentum are close to the prelicted values by the CPS Model based on describing nuclear shapes in terms of a spherical harmonic expansion with lowest nine even order terms.
Abstract:
A plastic scintillator beta-detector telecope has been buit and calibrated.The uncertainty of linear energy calibration in the range of endpoint energy between 0.7 and 6.1MeV for both β－ and β+ emitters has been tested to be 35keV.
A plastic scintillator beta-detector telecope has been buit and calibrated.The uncertainty of linear energy calibration in the range of endpoint energy between 0.7 and 6.1MeV for both β－ and β+ emitters has been tested to be 35keV.
Abstract:
Inclusive momentum spectra of projectile-like fragments are decomposed to several components including a fragmentation contribution and a transfer contribution in the 20Ne(14.7,19.2MeV/u) induced reaction.The competition between these two reaction mechanisms with increasing beam energy is studied.
Inclusive momentum spectra of projectile-like fragments are decomposed to several components including a fragmentation contribution and a transfer contribution in the 20Ne(14.7,19.2MeV/u) induced reaction.The competition between these two reaction mechanisms with increasing beam energy is studied.
Abstract:
The existence of two Higgs-doublets will alter the splittings of 1p and 2p tt states and reduce the ratios of the splittings R.Careful Measurement of them will be helpful to clarify the existence of Higgs particle.
The existence of two Higgs-doublets will alter the splittings of 1p and 2p tt states and reduce the ratios of the splittings R.Careful Measurement of them will be helpful to clarify the existence of Higgs particle.
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