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Article
\(Wi\bar Zard\) 2: a proposal to complement \(Wi\bar Zard\) detector with two further modules of tracking calorimeter and an accurate spark counter t.o.f. systemdetector with two further modules of tracking calorimeter and an accurate spark counter t.o.f. system
Among the several existent proposals for the cosmic antimatter search, the Wi#x005A-0304;ard project for the U.S. Space Station Freedom shows the greatest interest. A possible upgrading of the Wi#x005A-0304;ar...
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Article
Measurement of electroweak parameters from hadronic and leptonic decays of theZ 0
We have studied the reactionse + e −→hadrons,e + e −, μ+ μ− and τ+ τ−, in the energy range 88.2 \( \leqq \sqrt s \leqq 94.2\) ...
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Article
Studies of hadronic event structure and comparisons with QCD models at theZ 0 resonance
The structure of hadronic events fromZ 0 decay is studied by measuring event shape variables, factorial moments, and the energy flow distribution. The distributions, after correction for detector effects and init...
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Article
Search for non-minimal Higgs bosons inZ 0 decays
We report on a search for the neutral and charged Higgs bosons predicted by models of spontaneous symmetry breaking with more than one Higgs doublet field. No signals are observed. We set model-independent lim...
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Article
Measurement of cross sections and leptonic forward-backward asymmetries at theZ pole and determination of electroweak parameters
We report on the measurement of the leptonic and hadronic cross sections and leptonic forward-backward asymmetries at theZ peak with the L3 detector at LEP. The total luminosity of 40.8 pb−1 collected in the year...
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Article
Measurement of the branching ratiosb →e ν X, μ ν X, τ ν X andν X
The inclusive semileptonic branching ratios b→eνX,μ νX,τ νX andνX have been measured at LEP with the L3 detector. The analysis is based on 2-jet hadronic Z decays obtained in the data collected between 1991 and 1...
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Article
Investigation of ytterbium fulleride compounds
We have synthesized the ytterbium fulleride compounds YbxC60 (x=1–6) at a range of lower temperature (530 °C–570 °C). Except for the nominal composition Yb3C60 compound, which has been reported in the references,...
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Article
Light-induced absorption instability in weakly reduced congruent Er:LiNbO3 crystal
Light-induced absorption (LIA) characteristics in weakly reduced (or strongly annealed) congruent and/or vapor transport equilibration (VTE)-treated Er-doped LiNbO3 crystals have been investigated in comparison w...
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Article
Raman scattering study of reduced Er:LiNbO3 crystals
Raman spectra of as-grown and reduced (or annealed) Er:LiNbO3 crystals, which have different cut orientations, varied Li/Nb ratio, and different Er-do** levels of 0.2, 0.4, 0.6, 1.0, and 2.0 mol%, were recorded...
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Article
Experimental studies of the π+π-π+π-π0, K+K-π+π-π0 and pp̄π+π-π0 final states produced in e+e- annihilation at \(\sqrt{s}= 3.773\) and 3.650 GeV
We report measurements of the observed cross sections for e+e-→ωπ+π-, ωK+K-, ωpp̄, K+K-ρ0π0, K+K-ρ+π-+c.c., K*0K-π+π0+c.c., K*+K-π+π-+c.c., φπ+π-π0 and ΛΛ̄π0 at
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Article
Open AccessStudy of J/ψ decaying into ωpp̄
The decay J/ψ→ωpp̄ is studied using a 5.8×107 J/ψ event sample accumulated with the BES II detector at the Bei**g Electron–Positron Collider. The decay branching fraction is measured to be B(J/ψ→ωpp̄)=(9.8±0.3±1...
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Article
Investigation of the structure and the physical properties of nickel-phosphorus ultra-black surfaces
Ultra-black materials with low reflectivity can be applied in many fields of science and technology. We deposited nickel-phosphorus alloys (Ni-P) on copper substrate with the electroless plating method and etc...
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Article
Effects of annealing treatment and gamma irradiation on the absorption and fluorescence spectra of Cr:GSGG laser crystal
The influence of annealing treatments and gamma-ray irradiation on the absorption and fluorescence spectra of Cr:GSGG crystals grown by the Czochralski method has been investigated. Two absorption bands locate...
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Article
Open AccessExperimental studies of e + e −→ some charmless processes containing K S 0 at \(\sqrt{s}=3.773\) and 3.65 GeV
We measure the observed cross sections for the charmless processes e + e −→K S
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Article
Open AccessSearch for ψ(3770)→ charmless final states involving η or π 0 mesons
We search for ψ(3770)→π + π − η, K + K − ...
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Article
Preparation and Magnetic Properties of (La1−x Sr1+x )(Mn0.5Co0.5)O4
A series of single phase (La1−x Sr1+x ) (Mn0.5Co0.5)O4 (0≤x≤0.40) materials with a tetragonal K2NiF4 structure was prepared by a solid state reaction method at 1400...
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Article
Theoretical Analysis of Diffraction Efficiency of Photocarrier Grating
The diffraction efficiency of the photocarrier grating (PCG) has been theoretically analyzed. Firstly, the model of the PCG has been set up, and the distribution of the carrier concentration has been studied. ...
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Article
Synthesis of Different-Sized La0.7Sr0.3MnO3 Nanoparticles via a Polyacrylamide Gel Route and Their Magnetocaloric Properties
In this work, a polyacrylamide gel route was used to synthesize La0.7Sr0.3MnO3 nanoparticles. It is shown that single-phase La0.7Sr0.3MnO3 nanoparticles with a rhombohedral perovskite structure can be prepared at...
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Article
Open AccessThe Physics of the B Factories
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Article
Theoretical Analysis of Nonlinear Recombination Process and Its Influence on Diffraction Efficiency of Steady-State Photocarrier Grating
A theoretical analysis of the steady-state photocarrier grating (SSPCG), which takes the nonlinear carrier recombination processes into account, has been presented. First, the nonlinear diffusion equation, con...
