1988 Vol. 12, No. 4
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Abstract:
A multi-state trapping model involving positron trapping at dislocations and jogs is proposed,in which the effect of positron detrapping can be omitted.According to this model the dislocations with variant jog density have different functions in posi...
A multi-state trapping model involving positron trapping at dislocations and jogs is proposed,in which the effect of positron detrapping can be omitted.According to this model the dislocations with variant jog density have different functions in posi...
Abstract:
We constructed a MWPC prototype with effective area of 100×100mm2 and cathode strips.The distribution of induced charge on cathode plane and spatial resolution along the anode wires were measured by 55Fe X-ray of 5.9keV.The effect of readout number o...
We constructed a MWPC prototype with effective area of 100×100mm2 and cathode strips.The distribution of induced charge on cathode plane and spatial resolution along the anode wires were measured by 55Fe X-ray of 5.9keV.The effect of readout number o...
Abstract:
The Doppler broadening of the two-photon annihilation line arising from the intermediate lifetime of positronium in a magnetic field has been measured using a time selecting γ-ray spectrometer.From the relation the kinetic energy and age.we have foun...
The Doppler broadening of the two-photon annihilation line arising from the intermediate lifetime of positronium in a magnetic field has been measured using a time selecting γ-ray spectrometer.From the relation the kinetic energy and age.we have foun...
Abstract:
A nuclear emulsion stack bombarded by 200GeV/nucleon oxygen nuclei has been analyzed.The measurement of a ternary fragmentation event of a relativistic oxygen nucleus into three helium nuclei and 22 minimum ionizing particles has been performed.The m...
A nuclear emulsion stack bombarded by 200GeV/nucleon oxygen nuclei has been analyzed.The measurement of a ternary fragmentation event of a relativistic oxygen nucleus into three helium nuclei and 22 minimum ionizing particles has been performed.The m...
Abstract:
Using the strong coupling expansion method in lattice gauge theory,we calculate the weak interaction matrix elements of │ΔS│=2.Our results of the KL-KS mass diference are not only consistent with those of meson mass spectrum obtained by the same meth...
Using the strong coupling expansion method in lattice gauge theory,we calculate the weak interaction matrix elements of │ΔS│=2.Our results of the KL-KS mass diference are not only consistent with those of meson mass spectrum obtained by the same meth...
Abstract:
Based on the DPM model,the multiparticle productions in K-p and π-p soft-collisions are studied,the emphasis is put on fragmentation regions,The inclusive distributions in fragmentation regions and the forwardbackward correlation are calculated.It is...
Based on the DPM model,the multiparticle productions in K-p and π-p soft-collisions are studied,the emphasis is put on fragmentation regions,The inclusive distributions in fragmentation regions and the forwardbackward correlation are calculated.It is...
Abstract:
An analytical method is used to investigate the chiral symmetry restoring phase transition at finite temperature and density.The self-consistency equations for the order parameter at T=0 are generalized and the corresponding equations at finite tempe...
An analytical method is used to investigate the chiral symmetry restoring phase transition at finite temperature and density.The self-consistency equations for the order parameter at T=0 are generalized and the corresponding equations at finite tempe...
Abstract:
The │ΔS│=1 weak interaction matrix elements of the nonleptonic K decays are calculated based on the strong coupling expansion method in lattice QCD.We compare our results with experiment,and show the enhancement of ΔI=1/2.
The │ΔS│=1 weak interaction matrix elements of the nonleptonic K decays are calculated based on the strong coupling expansion method in lattice QCD.We compare our results with experiment,and show the enhancement of ΔI=1/2.
Abstract:
We discuss GUT including an extra Z0,while preserving the results of the standard model,and surmounting the difficulty of the proton decay.The increasing fermions are not bizarre Finally it is generalized to whole simple Li group.
We discuss GUT including an extra Z0,while preserving the results of the standard model,and surmounting the difficulty of the proton decay.The increasing fermions are not bizarre Finally it is generalized to whole simple Li group.
Abstract:
The probabilities of overlappings of wave functions and of quark exchanges of a nucleon with its surrounding nucleons in nuclei are calculated.We obtain the deep inelastic 1-A structure functions which agree well with experimental data.An explanation...
The probabilities of overlappings of wave functions and of quark exchanges of a nucleon with its surrounding nucleons in nuclei are calculated.We obtain the deep inelastic 1-A structure functions which agree well with experimental data.An explanation...
Abstract:
The antiproton-nucleus elastic scattering differential cross section of 12C,16,18O,40Ca and 208Pb at incident energies 50MeV and 180MeV have been calculated and analysed by optical potential.It is shown that the antiproton optical potential have stro...
The antiproton-nucleus elastic scattering differential cross section of 12C,16,18O,40Ca and 208Pb at incident energies 50MeV and 180MeV have been calculated and analysed by optical potential.It is shown that the antiproton optical potential have stro...
Abstract:
Large-angle elastic cross sections for the scattering of π+ and π－ from 16O at 114MeV are calculated using the first-order optical potential constructed from the α-particle model of 16O.The calculated results show that obvious improvement is obtained...
Large-angle elastic cross sections for the scattering of π+ and π－ from 16O at 114MeV are calculated using the first-order optical potential constructed from the α-particle model of 16O.The calculated results show that obvious improvement is obtained...
Abstract:
In this paper the performance of a new type (modulating widths type)of linear periodic magnets is analysed.In ideal 2-dimensional case the field produced by this type of magnet is pure sinusoidal.Soft iron shield can be used to strengthen the magneti...
In this paper the performance of a new type (modulating widths type)of linear periodic magnets is analysed.In ideal 2-dimensional case the field produced by this type of magnet is pure sinusoidal.Soft iron shield can be used to strengthen the magneti...
Abstract:
The three-fold differential cross sections d3σ/dA dZ dE of the projectile-like fragment produced by 80.9MeV 16O on 27Al were measured by using the time of flight system with ΔE-E telescope.
The dissipation process and the nucleon transfer in this reac...
The three-fold differential cross sections d3σ/dA dZ dE of the projectile-like fragment produced by 80.9MeV 16O on 27Al were measured by using the time of flight system with ΔE-E telescope.
The dissipation process and the nucleon transfer in this reac...
Abstract:
A new type of ionization chamber telescope is introduced which consists of two ionization chambers in series followed by a position sensitive semiconductor Si detector.The trajectory of the incident particles is parallel to the direction of the elect...
A new type of ionization chamber telescope is introduced which consists of two ionization chambers in series followed by a position sensitive semiconductor Si detector.The trajectory of the incident particles is parallel to the direction of the elect...
Abstract:
The particle-number-conserving approach for treating nuclear pairing correlation is extended to treat the eigenvalue problem of the cranking hamiltonian.Detailed information about the seniority structure and the K-structure of the low-lying bands,and...
The particle-number-conserving approach for treating nuclear pairing correlation is extended to treat the eigenvalue problem of the cranking hamiltonian.Detailed information about the seniority structure and the K-structure of the low-lying bands,and...
Abstract:
Using the numbers of excited particles and holes calculated by dissipative diabatic dynamics (DDD) as the initial exciton number n0,the energy spectra and angular distributions of emitted light particles for 40Ca+40Ca and 58Ni+58Ni at different bomba...
Using the numbers of excited particles and holes calculated by dissipative diabatic dynamics (DDD) as the initial exciton number n0,the energy spectra and angular distributions of emitted light particles for 40Ca+40Ca and 58Ni+58Ni at different bomba...
Abstract:
An exciton state density with angular momentum is derived in this paper based on statistical theory.The square of the spin-cut factor σn is proportional to the exciton number and the nuclear moment of inertia.When the exciton system closes to the sta...
An exciton state density with angular momentum is derived in this paper based on statistical theory.The square of the spin-cut factor σn is proportional to the exciton number and the nuclear moment of inertia.When the exciton system closes to the sta...
Abstract:
Recently a new positive parity rotational band was observed,its moment of inertia is a bit larger than of ground,β and γ bands for some even-even nuclei of the actinide and rare-earth regions,and also was negative parity band.These facts can be inter...
Recently a new positive parity rotational band was observed,its moment of inertia is a bit larger than of ground,β and γ bands for some even-even nuclei of the actinide and rare-earth regions,and also was negative parity band.These facts can be inter...
Abstract:
A new continuous variable representation of the Elliott SU(3) model is given.Based on this representation,a novel approach——the extreme state eigen equation approach is proposed,by which all irreducible representation bases of SU(3) in canonical grou...
A new continuous variable representation of the Elliott SU(3) model is given.Based on this representation,a novel approach——the extreme state eigen equation approach is proposed,by which all irreducible representation bases of SU(3) in canonical grou...
Abstract:
The concepts of internal transformation brackets of 4-body systems and quasi-Eular angle have been introduced in this paper.With their aid,the calculation of the 4-body hyperspherical transformation brackets can be greatly simplified by using those o...
The concepts of internal transformation brackets of 4-body systems and quasi-Eular angle have been introduced in this paper.With their aid,the calculation of the 4-body hyperspherical transformation brackets can be greatly simplified by using those o...
Abstract:
A convenient block method used for high dimensional random triangle lattice has been applied to the monte carlo renormalization group study of Ising model on three-dimensional random triangle lattice.The critical exponents obtained are found to be co...
A convenient block method used for high dimensional random triangle lattice has been applied to the monte carlo renormalization group study of Ising model on three-dimensional random triangle lattice.The critical exponents obtained are found to be co...
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