1997 Vol. 21, No. 5
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Abstract:
Decays of the J/ψ resonance into the final states with three photons are investigated.Branching ratios for the decays of J/ψ→γπ0 and J/ψ→γη'are determined to be Br (J/ψ→γπ0)=(4.6±1.1)×10－5 and. Br(J/ψ→γη')＝(4.12±0.82)×10－3. The ratio of the two decay...
Decays of the J/ψ resonance into the final states with three photons are investigated.Branching ratios for the decays of J/ψ→γπ0 and J/ψ→γη'are determined to be Br (J/ψ→γπ0)=(4.6±1.1)×10－5 and. Br(J/ψ→γη')＝(4.12±0.82)×10－3. The ratio of the two decay...
Abstract:
High-spin states in 162Lu have been roduced and studied via 147Sm (19F, 4nγ) 162Lu reaction. lh-beam γ-rays were measured by using 1 planar detector and 7 high purity Ge detectors with BGO anti-Compton Shield. The level scheme of the yrast band in 16...
High-spin states in 162Lu have been roduced and studied via 147Sm (19F, 4nγ) 162Lu reaction. lh-beam γ-rays were measured by using 1 planar detector and 7 high purity Ge detectors with BGO anti-Compton Shield. The level scheme of the yrast band in 16...
Abstract:
Yields of lr isotopes from 12C (47MeV/u)＋197Au have been measured by using chemical separation and γ spectroscopy method. The lr isotope distribution was ob tained after correction for decay during the irradiation period by using the accutnulation yi...
Yields of lr isotopes from 12C (47MeV/u)＋197Au have been measured by using chemical separation and γ spectroscopy method. The lr isotope distribution was ob tained after correction for decay during the irradiation period by using the accutnulation yi...
Abstract:
The density matrices of J/ψ produced in the non-polarized e+－e－ collisions in both experimental laboratory and helicity frame are discussed. The results show that rthe conclkusion for only J/ψ with the helicity ±1 having contributions to the procss i...
The density matrices of J/ψ produced in the non-polarized e+－e－ collisions in both experimental laboratory and helicity frame are discussed. The results show that rthe conclkusion for only J/ψ with the helicity ±1 having contributions to the procss i...
Abstract:
We calulate the psedo-Goldstone-bosons (PGB) contributions to the decay Bc→Ds γ in one generation technicolor model (TCI) and the technicolor model with massless doublet (TCⅡ),and compare with the contributions estimated in the standard model. We fin...
We calulate the psedo-Goldstone-bosons (PGB) contributions to the decay Bc→Ds γ in one generation technicolor model (TCI) and the technicolor model with massless doublet (TCⅡ),and compare with the contributions estimated in the standard model. We fin...
Abstract:
The infrared divergences of three-loop vacuum graphs of massless scalar and gluonfields and their regularization are discussed. The expression for analytical continuation is given. How to seperate the infrared and collinear divergences from overlap o...
The infrared divergences of three-loop vacuum graphs of massless scalar and gluonfields and their regularization are discussed. The expression for analytical continuation is given. How to seperate the infrared and collinear divergences from overlap o...
Abstract:
Using the extended x-rescaling model and taking account of the nuclear shadowingeffect by the spatial overlap of sea quarks and gluons from neighbouring nucleons in the nucleus in small x region, we calculate the ratios Gsn(x)/Gc(x). The calculated r...
Using the extended x-rescaling model and taking account of the nuclear shadowingeffect by the spatial overlap of sea quarks and gluons from neighbouring nucleons in the nucleus in small x region, we calculate the ratios Gsn(x)/Gc(x). The calculated r...
Abstract:
Within the framework of the nuclear pair shell model, numerical calculation is performed in the truncated SD subspace. In this calculation, the S pair is taken as that from the BCS calculation, the D pair is obtained through D＝for the even-even nucle...
Within the framework of the nuclear pair shell model, numerical calculation is performed in the truncated SD subspace. In this calculation, the S pair is taken as that from the BCS calculation, the D pair is obtained through D＝for the even-even nucle...
Abstract:
A Simulation is carried out for five different phases of nuclear equation of state. thegas, the liquid, the super heated liquid, the super cooled gas and the mechanical instability of spinodal phases, which are obtained from a deasity, tempemperature...
A Simulation is carried out for five different phases of nuclear equation of state. thegas, the liquid, the super heated liquid, the super cooled gas and the mechanical instability of spinodal phases, which are obtained from a deasity, tempemperature...
Abstract:
Monte Carlo Calculations of the isomeric cross section ratio for (n,2n)reaction based on the compound nuclear reaction theories and exciton-model are presented. Thecalculations are compared with experimental measurements for 59Co (n,2n)58Co, 93Nb(n,2...
Monte Carlo Calculations of the isomeric cross section ratio for (n,2n)reaction based on the compound nuclear reaction theories and exciton-model are presented. Thecalculations are compared with experimental measurements for 59Co (n,2n)58Co, 93Nb(n,2...
Abstract:
The relationship between Bose-Einstein coheremt radius and source radius (orroot-mean-square radius),and their dependence on the experimental windows of rapidity and transverse momentum are studied for pion source in 160A GeV/c Pb+Pb collisions,The m...
The relationship between Bose-Einstein coheremt radius and source radius (orroot-mean-square radius),and their dependence on the experimental windows of rapidity and transverse momentum are studied for pion source in 160A GeV/c Pb+Pb collisions,The m...
Abstract:
The different modes are to Study the effect of the compet ition between the energy internalvibration and thecollective rotational energy. It is found that thie competition will affect the geometricstu cture and the space orientation. of the states of...
The different modes are to Study the effect of the compet ition between the energy internalvibration and thecollective rotational energy. It is found that thie competition will affect the geometricstu cture and the space orientation. of the states of...
Abstract:
A novel multi-cavity RF thermionic gun with much less back bombardment effect has beea designed, built, tested and experiraeated. ln this paper we mainly discuss the expermental results of this RF gun From the pulse shapea of BCT at the gun exit and ...
A novel multi-cavity RF thermionic gun with much less back bombardment effect has beea designed, built, tested and experiraeated. ln this paper we mainly discuss the expermental results of this RF gun From the pulse shapea of BCT at the gun exit and ...
Abstract:
The synchrotron radiation (SR)microprobe XRF experimental station of Beijing Synchrotron Radiation Facility (BSRF)is located at the end of the 4W1A white SR beam line.The major instruments of the station are: ion chamber system for beam intensity mon...
The synchrotron radiation (SR)microprobe XRF experimental station of Beijing Synchrotron Radiation Facility (BSRF)is located at the end of the 4W1A white SR beam line.The major instruments of the station are: ion chamber system for beam intensity mon...
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