1989 Vol. 13, No. 3
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A gamma-ray family event with the showers distributed in the form of two concentric rings has been found in the Mt.Kanbala Emulsion Chamber experiment.The radii of the two rings are 4mm and 10mm respectively.This event exhibits some features clearly deviated from those of ordinaly big families.In this paper,some charateristic features of the rings are analysed and short discussion is made.
A CR-39 track detector was used both as a target and a detector to study the interaction of 960A MeV 238U ions with light nuclei (1H,12C,16O).The range mean free path and cross section of 690A MeV 238U ions in CR-39 have been found to be 6.8cm,4.33cm and 2160mb respectively.The average multiplicity due to fragmentation of 238U projectiles with light nuclei has been found to be 2.03.It is shown that the most common mode of interaction is binary fission.The reaction products consist of two track peaks according to track diameter distribution.The ratio of track density of each peak to track density of reaction products comes out to be 20% and 80% respectively.
A mechanism of high-energy unequi-nuclei collisions is proposed in this paper.The spacetime evolution of high-energy unequi-nuclei collision is discussed with the help of the hydrodynamical model.It explained successfully the characteristic features of the rapidety distribution of the final state particles for the several typical cosmic ray events and the first preliminary results from an experiment of a beam of 200A GeV 16O collision on emulsion at the CERN SPS.
According to WNW condition,a systematic analysis about the restraints from GUT on chiral three-preon model with confining weak interaction is discussed.It shows that the metacolor gauge group may not be SU(N) or SO(M),but may be semisimple group,for example,SU(N)×SO(M) or SU(N)×SU(M).By calculating,the candidats are GMC=SU(3)×SO(5) and GU≥SU(11),GMC=SU(3)×SU(2) and GU≥SU(12) under conditions:1014GeV≤Λu≤1019GeV and 300GeV≤ΛMC≤1TeV.
The discussion on kaons conden sation at zero temperature given by Brown et al.is generalized to that at finite temperature.It shows that the critical nuclear density is little influenced by temperature.The new phase may be formed in heavy ion reaction.
We point out that in certain region of t quark mass and KM parameters,the nearly CP even eigenstate Bd+ can be longer lived than the nearly CP odd one Bd－.If this happens,many CP violation effects should change their signs correspondingly.
In the normal fuzzy lattice fermion scheme,a reasonable and self-cosistent Fourier transformation shows a breakdown of the periodicity in the momentum space.It means that there is not special multiplicity.The Feynman rules in weak coupling limit are discussed.The one-loop perturbative calculation gives a regulator Adler-Bell-Jackiw chiral anomaly.
This paper gives the relation between the helicity formalism(HF) and the effective interaction formalism (EIF) for the process e+e－→J/ψ→γB,B→P1P2.The angular distributions of the pseudoscalar meson for different spin (J=2,4) of B indicate that there exist sensitive and insensitive regions to determine the spin of B.Unfortunately the data of θ/f2(1720) and ξ(2230) just fall into the insensitive region.
The 14.7MeV neutron elastic scattering on mid- and heavy-nucleus and C,Be nucleus in the range 2°—10° is investigated.Differential scattering cross sections have been measured by using a φ50×80mm liquid scintillator detector.The measured results agree well with other recent published work.In present article n-γ discrimination test and performance for this long cylinarical liquid scintillator detector has been introduced.
The local relaxation time of single particle degrees of freedom have been estimate under the approximate transition-rate-like from the master equation of occupation number.The characters of local relaxation time are discussed for one-body collision and for two-body collision processes separately.
The effects of static and dynamical deformation on isoscalar GQR and isovector GDR are discussed in the framework of semiclassical approximation with scaling ansatz.Static deformation results in double-peak splitting which is in agreement with experimental evidence,while dynamical deformation destroys all degeneracy between different K(K is the projected angular momentum).
Under the condition of high energy projectile's incidence,the discussion on statistical property of configurations of the first collision gives a complete expression of problem of initial value in preequilibrium process induced by complex projectile.
The properties of M1 and E2 transitions in odd-A rare-earth nuclei are investigated by means of the extended particle-rotor model.shows that the effects of hexadecapole deformation of the core and the second-order coriolis interaction in the rotational hamiltonian on the signature-dependence and the values averaged over the signature α=±1/2 of M1 and E2 transition rates in odd-A nuclei can not be neglected.
Introduced the multi-emission effect and the coupling between them in the exciton model,the multiplicities of preequilibrium emitted nucleons have been calculated and compared with experimental data.
Using the dynamical supersymmetry model U(36/24),the low-lying energy levels in 30P,30si,31P,31Si are discussed.The obtained results show that the dynamical supersymmetry may exist in the region of light nuclei.
Based on a geometric consideration the multiplicity distribution data of AN 35 are fitted very well.The KNO scaling for the same colliding nuclei is obtained.The change of
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