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AbstractAbstract

[en] The nucleon-meson vertex structure is discussed by using the transition potential of one-gluon exchange with the production of a quark-antiquark pair, which is deduced from quark-gluon interaction, based on the nonrelativistic quark model. The transition probabilities for nucleon→nucleon+meson, obtained by generator-coordinate method, show that the mesons exchanged in the nucleon-nucleon interaction are produced mainly in the surface region of a nucleon. However, there also exist some probabilities of finding mesons inside a nucleon. The fact that the relative probability of π meson is largest in the long-range interaction shows its importance in the processes of meson exchange. The effect of meson size on probabilities, which shows the coupling strength of meson and nucleon, is also discussed

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Chinese Physics; ISSN 0273-429X; ; v. 5(1); p. 115-121

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[en] The comparison between BMM and IBM is comprehensively discussed in the spirit of transformation theory by using the generator coordinate method (GCM). Some differences existing between these two essentially equivalent models are pointed out on the phenomenological level, and the possibility of distinguishing between them is briefly discussed

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Chinese Physics; ISSN 0273-429X; ; v. 5(1); p. 87-95

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AbstractAbstract

[en] This paper investigates the physical nature of a series of step structures or oscillations present in a Josephson current within one magnetic flux quantum when either a Josephson junction, a double junction squId, or a single junction superconducting ring is placed inside a high Q cavity under the condition in which the Josephson frequency is equal to the resonance frequency of the cavity. The frequency effect of the feedback field produces a series of induced current steps in the Josephson junction or the two-junction squId when ω = ω/sub r/. The oscillating electromagnetic field excited by the junction current acts on the junction itself. A series of new current step structures occur within one magnetic flux phi

_{0}quantum, since the amplitude of the feedback field is modulated by an applied magnetic field as the modulation of the amplitude of the feedback field is coupled to that of the radiation. For the superconducting ring containing a single junction, as nω = ω/sub r/, the feedback radiation of the stationary electromagnetic wave will give rise to a constrained oscillation of the supercurrent with a period smaller than that of the superconducting current oscillation phi_{0}Record Type

Journal Article

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Chinese Physics; ISSN 0273-429X; ; v. 5(1); p. 1-10

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AbstractAbstract

[en] A new planar-continuum potential, the sine-squared potential, is introduced to analyze the behavior of particle motion in a planar channel, and the equation of particle motion is reduced to the well-known pendulum equation. Particle motion equation and oscillation period are solved exactly by Jacobi elliptic functions and the first kind of complete elliptic integral. Radiation intensity and spectral characteristics of Kumakhov radiation are analyzed. The results show that Kumakhov radiation is a promising new source for the γ-ray laser

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Chinese Physics; ISSN 0273-429X; ; v. 4(3); p. 670-675

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AbstractAbstract

[en] The McMillan tunneling model has been generalized and applied to an N-S multifilm structure with thickness of each film smaller than the superconducting coherent length. The order parameters and superconducting critical temperature of the structure are calculated, and the possibilities of enhancing T, by modifying the electron-phonon coupling and contaminating with different atoms in the interface regions are also discussed

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Chinese Physics; ISSN 0273-429X; ; v. 5(1); p. 52-59

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AbstractAbstract

[en] The principle of the inverse Cherenko focusing laser accelerator is presented. When the condition for Cherenkov radiation is satisfied, dynamics of the charged particles shows that electrons can be accelerated in a sustained and stable mode without additional external focusing systems. Since the electric field of the laser on the focusing axis is the accelerating field, its intensity is greater than that of the previously proposed inverse Cherenkov laser accelerator. The limitations of this accelerating mechanism are also discussed. 5 references

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AbstractAbstract

[en] The most accurate tau lifetime measurement in e

^{+}e^{-}experiments to date is reported by MARK II with the value (3.20 +- 0.41 +- 0.35) x 10^{-13}sec wherein the second and the third terms are statistical and systematic errors, respectively. The MARK II vertex chamber has a 19-cm lever arm over which particle tracks are measured. Under similar conditions of beam pipe thickness, beam size and integrated luminosity (40 pb^{-1}) but smaller lever arm (9 cm), by using a TEC (Time Expansion Chamber) type vertex chamber with 40 μ position resolution in the r-phi plane, Monte Carlo calculation shows that the statistical error of the tau lifetime can be decreased to 0.13 x 10^{-13}sec at center-of-mass energy √S = 40 GeV. By varying parameters of the vertex chamber by +- 10% and taking hadron-events contamination into account as well, the systematic error has been estimated to be comparable to the statistical errorPrimary Subject

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Numerical Data

Journal

Chinese Physics; ISSN 0273-429X; ; v. 5(1); p. 100-109

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AbstractAbstract

[en] The phase shifts and differential cross sections of n+

^{6}Li elastic scattering are calculated and the d-α cluster structure in^{6}Li and the exchange effects in n+^{6}Li scattering states are studied by the QRGM which is an RGM with omitting the antisymmetrization with the nucleons in the α cluster. The results show that there exists a marked d-α cluster structure in^{6}Li. Therefore it is very important to choose carefully the cluster structure wave function of^{6}Li, especially the relative motion wave function between d and α. The results obtained by the QRGM are in agreement with those obtained by the RGMPrimary Subject

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Chinese Physics; ISSN 0273-429X; ; v. 5(1); p. 77-83

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AbstractAbstract

[en] The charge form factors of

^{24}Mg,^{27}Al,^{28}Si,^{32}S and their energy variation are calculated using the theory of statistical spectroscopy. A qualitative agreement between calculation and experiment is achieved. The influence of the second-order polynomial is investigated. For the examples examined in this paper, its effect is small. This indicates that the convergence of the theory is goodPrimary Subject

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Chinese Physics; ISSN 0273-429X; ; v. 4(4); p. 866-873

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AbstractAbstract

[en] Beta-delayed proton precursors

^{33}Ar and^{49}Fe have been produced via the (^{12}C,3n) reaction in 65-MeV carbon bombardments of^{24}Mg and^{40}Ca, respectively. The major proton peaks are at 3.28 +- 0.07 MeV for^{33}Ar and 1.98 +- 0.04 MeV for^{49}Fe. The corresponding cross section for^{33}Ar is 0.40 +- 0.08 μb, and for^{49}Fe 0.70 +- 0.14 μb. The half-life of^{33}Ar was determined to be 167 +- 24 msPrimary Subject

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Numerical Data

Journal

Chinese Physics; ISSN 0273-429X; ; v. 5(1); p. 84-86

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ARGON ISOTOPES, BARYONS, BETA DECAY, BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, DATA, ELEMENTARY PARTICLES, ENERGY RANGE, EVEN-ODD NUCLEI, FERMIONS, HADRONS, HEAVY ION REACTIONS, INFORMATION, INTERMEDIATE MASS NUCLEI, IRON ISOTOPES, ISOTOPES, LIGHT NUCLEI, MEV RANGE, NUCLEAR DECAY, NUCLEAR REACTIONS, NUCLEI, NUCLEONS, NUMERICAL DATA, RADIOISOTOPES, SPECTRA, TARGETS

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