1998 Vol. 22, No. 03
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In a four-parameter experiment the correlation between the neutron and γ-ray emission and the kinetic energy of the light-charged-particles (LCPs), such as alphas, tritons, deuterons and protons, was measured. The results show that the positive correlation called anomalies of the neutron and γ-ray emission in this paper, was observed for fission accompanied by low energy LCPs. In the case of high energy LCP emission, however, negative correlation was obtained. On the basis of the model calculation, the positive correlation is discussed tentatively.
The momentum resolution and ionization energy loss in a high precision central drift chamber used to detect the low momentum charged particles are estimated. The measurement of the low momentum charged particles and the particle identification by the dE/dx method with the chamber are discussed. The detection of two typical physics processes is investigated.
High-spin states in 79Kr were studied via the fusion evaporation reaction 55Mn(30Si, apn) at 130MeV. Prompt γγγ-charged particle coincidences were made using the GASP array in conjunction with the ΔE-E Si(Au) charged particle ball. Nine new states were found, along with 10 new transitions in the K=5-/2 band. The favored (a=+1/2) and unfavored (a=－1/2) signature sequences were extended up to states of (37-/2)8992 keV and (59－/2)20132 keV, respectively. A cranked shell-model analysis has been made to discuss the experimental results.
Using perturbative method we calculate Wilson loop functionals (WLFs) for Kerr gravitational field and for R+ R2+R..R.. + R....R.... quantum gravity. The results show that localized curvature excitations of order hκ2 exist in this type of higherderivative quantum gravity
The eigenstates of the higher power of the two-paranneter deformed multi-mode bose opcmtors are constructed. It is found that they form a complete Hilbert space Further more, the mathematical structure and the corresponding boson realization of the two-parameterr deformed quantum algebra SLq,s(3) are given, and the 1/2 ratk tensor-like operators of SLq,s(2) are also presented. It is pointed out that the results of SLq,s(3) is easily generalized to a multi-mode case.
We question the validity of the multiplicity data 〈D*++D*－〉=0.43±0.07 in e+e－ annihilation at s= 29-35 GeV which is listed in Review of Particle Physics. After annalyzing five sets of data provided by five different collaborations, we derive the world average value: 〈D*++D*－〉=0.24±0.02 This result is in contradiction with that listed in Review of Particle Physics.
In this paper, a dynamic variable S is used to describe quark spin and the classical transport equation of quarks is set up. The onsistency of the classical transport equation with quantum ransport equation is discussed. Some properties of classical distribution function in color and spin spaces are explored through comparing the consistency.
It is shown that if the contribution of the negative energy sea is taken into account a good saturation curve and a good result of in compressibility K—1v, can be obtained in the relativistic σ-ω Model. The divergent integrals are dealt with by the form factor regularization scheme. The effect of the contact interaction caused by the ω-meson is investigated in some detail. The average residual number of mesons per nucleon in the nuclear ground state is also calculated.
We analyse K-meson photoproduction off proton and its associated radiative capture process in Low Energy QCD Lagrangian. The two processes.are related to each other by the Crossing Symmetry. In the framework of chiral quark model, we give a unified description of the two processes. Our theoretical prediction for branching ratio in radiative capture process is in good agreement with the experimental data.
The energy spectra and E2 transition probabilities of three-boson nuclei 46Ti and
The effect of angular momentum on the prescission particle multilplicity in the reaction of 10.6MeV/u 84Kr(27Al,binary fission) is studied using generalized fission diffused model.The prescission particle multilplicity and the scission time are found to increase with decreasing angular momentum. Most of the prescission particle is emitted before saddle. The consistency with the experimental particle multiplicity is obtained when we average with weight over angular momentum contribution to binary fission reaction. At the same time other factors which influence the prescission multiplicity and scission time are also discussed.
On the basis of Planck formula of black body radiation and experimental data, an empirical systematic formula with two djustable parameters is presented. For incident proton energies from threshold to 1 50MeV and target masses in 44<A<239 and 44<A<242 region, this formula can describe (p, n) and (p, 2n) reaction cross sections nicely.
The relativistic configuration mixing effect on the longitudinal transition amplitudes S1/2(Q2) is investigated. The study shows that the effect plays an important role in understanding of the longitudinal transitions of baryons.
The dose equivalent of neutrons from intermediate energy heavy ion reactions measured with a rem-meter would be underestimated because of the energy response of the instrument. Therefore the readings of rem-meter must be corrected in order to obtain the real dose equivalent The correction factors for dose equivalent ofneutrons from the reactions of 41.7MeV/u 12C+Fe and 100MeV/u 12C+C measured inside . shielding with both rem-meters the 10 in. diameter single-sphere rem-meter and the standard A-B rem-meter have been calculated. They could be applied in dose equivalent measurement for intermediate energy heavy ion reactions.
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