共查询到20条相似文献,搜索用时 9 毫秒
1.
We outline major ideas involved in discussion of color coherence phenomena (CCP) at intermediate energies. We point out that the recent advances in calculating cross sections of hard exclusive processes off light nuclei allow to use the lightest nuclei for sensitive tests of CCP. Consistency of the results of the measurements of color transparency in quasielastic A(p,2p) and A(e,e′p) processes is emphasized. Evidence for presence of significant color fluctuations in nucleons and pions emerging from the study of diffractive processes is summarized. A new class of hard processes leading to three particle final state is suggested for electron and hadron projectiles. 相似文献
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A. B. Kurepin A. V. Dermenev M. B. Golubeva the CASTOR Collaboration 《Bulletin of the Russian Academy of Sciences: Physics》2011,75(3):399-401
The creation of the CASTOR forward calorimeter in the compact muon spectrometer (CMS) experiment at the Large Hadron Collider
(LHC), CERN enabled us to perform experiments at energies corresponding to those of cosmic rays but at much greater intensities,
the most important factor in studying rare and anomalous phenomena. 相似文献
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O. Benhar S. Fantoni G.I. Lykasov 《The European Physical Journal A - Hadrons and Nuclei》2000,7(3):415-419
The production of backward pions in lepton-nucleus collisions is analyzed. We show that a large yield of high momentum backward
pions can be explained by the Regge asymptotic of the distribution of nucleons carrying a large momentum fraction in the nuclear
target. The calculated spectra of pions emitted in the ν+ Ne →μ+π−+ X and ν+2H →μ+π−+ X reactions are in satisfactory agreement with the available experimental data.
Received: 22 July 1999 / Revised version: 22 November 1999 相似文献
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Multiplicities of hadrons produced in μp scattering are analyzed with a diquark scattering model. it is assumed that a proton is composed of a quark and a scaler diquark and that both the quark and the diquark act as partons. A reasonable agreement between the experimental data and the predictions of the model is obtained. In particular, the observed large ratio of the proton to the overall positive hadron yield forx>0.2 is successfully reproduced. 相似文献
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Based on a Hamiltonian of a charged particle system with an intrinsic magnetic moment in an external electromagnetic field
with the field of magnetic moments, quantum hydrodynamic equations are derived, including the equations for densities of particle
number, momentum, magnetic moment, and energy. In the self-consistent field approximation, a closed system of equations is
obtained, which provides the basis for investigation of collective physical phenomena in distributed quantum systems.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 74–80, December, 2007. 相似文献
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Kajari Mazumdar 《Pramana》2007,69(5):801-807
The principal physics motivation of the LHC experiments is to search for the Higgs boson and to probe the physics of TeV energy
scale. Potential of discovery for Higgs bosons in various scenarios beyond standard model have been estimated for both CMS
and ATLAS experiments through detailed detector simulations. Main results from the recently published studies of CMS collaboration
are only included in this write-up.
on behalf of the ATLAS and CMS Collaborations 相似文献
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Angular distributions of high energy He nuclei, emitted from the target in central 16O-AgBr interactions, are found to be highly forward-peaked at 0.2 GeV/nucleon but almost isotropic at 2 GeV/nucleon. The angular distributions are in qualitative agreement with recent shock-wave calculations. However, we observe no narrow peaks neither in the angular nor in the energy distributions of He nuclei. 相似文献
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Firooz Arash 《Czechoslovak Journal of Physics》2002,52(3):C119-C124
It is observed that the polarized scattering amplitudes in the Planar-Transverse frame exhibit a simple pattern in that all amplitudes are either pure real or pure imaginary relative to each other. It also suggests that one of the amplitudes is almost three times larger than the others. This pattern persists for a variety of exclusive reactions and becomes more pronounced at high energies and large scattering angles. 相似文献
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Total, total elastic and diffraction dissociation cross sections of
interactions are calculated in the leading logarithmic approximation of QCD in the energy region
accounting for absorption effects at the quark level. Our calculations with very large intercept of bare pomeron (>1/2) are in qualitative agreement with the data; however, we predict comparatively large cross section of double-diffraction dissociation. 相似文献
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L. Berny 《Zeitschrift fur Physik C Particles and Fields》1990,48(2):227-229
Previously published data on low-p T π+/K +/p?p interactions at 250 GeV/c are used to analyze the rapidity charge distribution and hadron structure function for the projectile hadrons. It is shown that the rapidity charge distribution for projectile hadrons can be approximated by a Gauss distribution, and their structure functions are found. 相似文献
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H. W. Wilschut M. J. van Goethem H. Löhner TAPS collaboration 《Czechoslovak Journal of Physics》2000,50(4):113-120
Photon angular distributions and energy spectra up to the kinematical limit have been measured in proton reactions with light and heavy targets. For the first time the dependence of photon spectra on scattered protons has been measured to investigate the influence of multiple-scattering processes on the photon production. A strong suppression of bremsstrahlung relative to a quasi-free production model using the free pn bremsstrahlung cross section is observed in the low-energy regime of the photon spectrum in p+nucleus reactions. We attribute this effect to modifications of the bremsstrahlung amplitude in the nuclear medium and to interference of photon amplitudes due to multiple scattering of nucleons. 相似文献
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I. Rotter 《Czechoslovak Journal of Physics》1998,48(6-7):858-861
In quantum systems at high level density, the states of the system are mixed strongly via the continuum of decay channels.
This mixing creates states with large external collectivity if the level density reaches some critical value. Besides this
external collectivity, the states may have some internal collectivity created by (internal) residual interaction in the corresponding
closed system. The cross section pattern at high level density is determined by the interplay of internal and external collectivity.
Presented at the International Conference on “Atomic Nuclei and Metallic Clusters”, Prague, September 1–5, 1997. 相似文献
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Yurii S. Sigov 《Physica D: Nonlinear Phenomena》1981,2(1):165-169
A short review of the results of one- and two-dimensional computer investigations of strong Langmuir turbulence is given. The main topics of interest are the following: formation of high energetic electron tails; ion sound turbulence accompanying collapse and plasmons' conversion; modulation instability (MI) in X,Y-geometry for and ; MI in transverse magnetic field. The case of the “forced” collapse (quasicollapse) in presence of an external pump is considered. 相似文献
16.
Nonequilibrium collective phenomena and effects of nonlinear pattern formation play the crucial role in the onset of pitting corrosion on stainless steels. Such materials are naturally protected by the oxide layer covering their surface. The onset of pitting corrosion involves the development of microscopic metastable pits, each persisting for about a second. As proposed in our publications and confirmed in subsequent experiments, sudden transition to active corrosion results from chain reproduction of metastable pits on the stainless steel surface leading to an autocatalytic explosion. 相似文献
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N. V. Krasnikov 《Russian Physics Journal》1977,20(5):574-576
The consequences of a six-quark model of weak and electromagnetic hadron interactions are considered for highly inelastic lepton- hadron scattering.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 20–24, May, 1977.I wish to thank V. A. Kuz'min, A. N. Tavkhelidze, and K. G. Chetyrkin for useful discussions. 相似文献