1993 Vol. 17, No. 6
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The applications of CsI(T1) scintillator with photodiode read out in heavy ion-induced reaction experiment are reported.This kind of detector has been used as E detector in a ΔE-E telescope with silicon as ΔE detector,and has been used to measure the light charged particles.Time of crossing zero point method has been employed in the experiment with a new kind of electronics,and has been used to indentify the light charged particles.
The traditional clustering method was improved.the family events were clustered in the scanning way,the criterion of multi-core event was redefined,through comparing the experimental results of multi-core events with simulation calculation,the nuclear interactions in the superhigh energy region were studied.Simultaneously,the method of using the energy fraction of main clusters to distinguish the big family event (∑Eγ≥500TeV) which is produced by primary proton was proposed by this work.
The mechanism of friction-evaporation process for target spectator contact layer in high energy nucleus-nucleus collisions is presented.The distribution of multiplicity,azimuthal and spatial angles,transverse and total momenta,as well as kinetic energy of target black fragments are calculated and compared with the experimental results of 200GeV/N 16O-Em interactions.
We measured the angular distribution of emitted neutrons with energy greater than 11MeV and 20MeV in the 50MeV/u 12C-ion experimental target area using the activation method of threshold detector.
The hadronic decay process J/ψ→V1+X,X→V2+V3,V2、V3→2P or 3P(Vi and P stand for vector and pseudoscalar meson,respectively)has been discussed by using the generalized moment analysis method in this paper.The formulas of moment corresponding to the intermediate state X with various spin-parity have been presented.The values of helicity amplitudes for the process X→V2+V3 are calculated in the nonrelativistic case.The spin,parity and partial-wave state of the intermediate particle X can be determined by comparing the theoretical values and data of some moments.
We discuss the physical implications for the new measurement of τ lepton mass.The Value of τ lifetime is predictcd.
In this paper the experimental value of radiative correction Δr was derived from the new data of sin 2θw and W boson mass Mw given by LEP,CDF and other collaborations.A careful comparison of (Δr)exp with the standard model expectation was carried out.We first calculated the Δr at full one-loop level,and then the main two-loop contributions were included.More stringent upper bounds on Mt were obtained from the analysis of probability distribution:Mt175GeV at 95%C.L. for a given MH=100GeV.The effects on Nt from other experimental and theoretical errors were also computed.
In this article,we discussed the Hamiltonian formalism of BFOFW model,studied its Dirac canonical quantization and BFV-BRST quantization.We proposed a new kind of gauged WZNW theories,which was called in the text generalized BFOFW model.
The free energy on genus g Riemann surface is derived by introducing two-dimensional scalar field and using Vafa's operator approach.The modular duality relation of specific heat is also obtained.
A new explicit transformation about the static axially symmetric self-dual Yang-Mills(SDYM) fields is presented.The theory has proved that the new transformation is a symmetric one.For the two kinds of the Lie algebraic generators of the Lie group SL (N.R)/SO(N),the corresponding transformations are given.By making use of the Yang-Baxter equality and their square brackets we have obtained the Loop and comformal algebraic structures of the symmetric transformations for the basic fields.All the results obtained in this paper can be directly generalized to the other models.
The influences of the dynamical parameters between the ground state and saddle point for the three-dimensional fissioning nuclear system on the escape rate over the potential barrier by using the distance of mass centers,neck parameter and asymmetric coordinate are stuied realistically.The effects of the quantum and angular momentum are added majorly.Some views on multidimensional correction for the fission rate clered.
Starting from the Walecka model about relativistic nucleon-meson field theory,the effect of interaction range in the relativistic microscopic optical potentials for nucleon-nucleus is included by folding the optical potentials in Local Density Approximity with nucleon-nucleon interaction potentials from the Walecka model.The present potentials are used to analyze the proton elastic scattering from nuclei.The agreement of the present calculation with experiment data is better than that of LDA.
In this article the solution of dynamical equation of motion of IBM-Ⅱ in continuous variable representation is discussed.With appropriate transformation and approximation,the on-phase part of system manifests the vibration-rotation mode and the off-phase part the 'scissor mode',ect.In the last section the energy spectrum of 156Gd is calculated.The result can well reproduce the algebraic result of IBM-Ⅱ.
The microscopic optical potential,mean free paths and Schrodinger equivalent potential of nucleons at finite temperature in nuclear matter are studied based on Walecka's model and thermo field dynamics.We let only the Hartree-Fock self-energy of nucleon represent to be the real part of the microscopic optical potential and the fourth order of meson exchange diagrams,i.e. the core polarization represent the imaginary part of microscopic optical potential in nuclear matter.The microscopic optical potential of finite nuclei is obtained with the local density approximation.
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