1991 Vol. 15, No. 2
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The relation of the live times and S parameters with doped quantities of Na+ have been studied by positron annihilation method in pure,colourable and irradiant KC1 single crystals,The results show that the concentration of vacancies of KC1 doped with 800ppm Na+ is 4.24×1017/cm3.It is close to that of the pure KC1 crystal.The obvious F centers exist in the colorated crystal.The S parameters are mainly influenced by the external electrons of halide ions.Mechanism of annihilation of KC1 crystal doped with Na+ has been discussed.
215 blocks of K6,K7,K8 lead emulsion chambers on Mt.Kanbala are carefully scanned,and a total of 111 muon events are found with zenith angle M(=tgθ)>2.5.The energy of muon showers are determined by saddle-shape curves.The intensity of muon,the energy spectrum and the zenith angle distribution of muon showers on the altitude of 5500m above sea level are shown in the energy region Eμ>2TeV.Meanwhile the simulation calculation is done for the behaviour of muon inside the emulsion chamber,simulation results are basically in agreement with the experiment.
A sufficient and necessary condition that two order transformation of field variable in non-abelian gauge field is equal to zero is derived.Two order transformation of both the parameter of Group and field variable of Fermi fields are necessarily equal to zero.
Finite temperature renormalization group equation is employed to investigate the effective coupling constant of QCD with respect to temperature.At high temperature,it is very small over the entire region of momentum,this leads to the property of deconfinement of QCD.
The fitted spatial parameter from intensity interferometry relates to an average radius
The intermittency of multiparticle production processes in high energies oxygen,silicon and sulphur induced emulsion and sulphur gold interactions are investigated systematically.It is found that in the pseudorapidity region 1～0.1,the EMU01 data exhabits the intermittent behaviour.The intermittent indexes are found to decreases with increasing the incident energy and mean multiplicity and to increase with increasing target mass.It seems also to increase as the projectile mass increases.
We use the Hartree-Fock equation and the linear response theory in finite temperature to calculate the positions and transition strenghths of the giant resonances of high-excited nucleus Pb28.The result shows a downward shift and a broadening of the giant resonance energies as temperature increases.
The onset of deformation in the N=88～90 region and the effects of the gap at Z=64 subshell on nucler structure are investigated in a microscopic approach of the interacting boson model.It turns out that,besides the n-p interaction,the distribution of single particle levels in the shell model space also plays a direct and important role in the rapid transition of spectrum structure.For Nd～Dy nuclei the calculations show excellent agreement agreement with experimental energy systematics.
The angular distributions and Wilczynski plots of emitted fragments from He to O in reaction of 16O+64Ni at 96MeV have been measured.The DIC cross section and intereaction time were obtained.DIC character of the reaction was discussed.The trace which shows that the emitted fragments of He and Li mainly come from the evaporation process of compound nuclei emerged.
The 14.7MeV neutron small-angle elastic scattering differential cross sections of C and Be are measured by a position-sensitive spectrometer with associated particle time-of-flight method.The corrections for neutron flux attenuation and multiple scattering are performed by using Monte-Carlo calculations.The experimental results are compared with the opticalmode calculation and other measurements.
120Ba was produced by 68MeV 16O beam bombarding a 2mg/cm2 thick 106Cd target and fluorated in a halium-jet ion source.The decay of on-line mass separated activity 120Ba has been studied by γ-X,γ-γ γ-β coincidence measurements.Its halflife was measured to be 24±2s.The total decay energy was extracted to be QEC=5.0±0.3MeV.A simple decay scheme has been proposed.
VCS representantions of SO5 SU2 SU2 U1 U1 and SO5 U1 U1 are discussed.Reduced matrix elements for SO5 SU2 SU2 are derived.The multiplicity of a weight for SO5 is determined by using the K-matrix technique.
The possible Beta-Delayed neutron precursors in the elements Tl,Hg,and Au were predicted following a systematic research for the known Beta-Delayed neutron precursors.The masses of the unknown nuclei and neutron emission probabilities were calculated.
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