1. Probing of compact baryonic configurations in nuclei in A(p, ¯p;)X reactions and antiproton formation length in nuclear matter.
- Author
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Kiselev, Yu. T., Sheinkman, V. A., Akindinov, A. V., Chumakov, M. M., Martemyanov, A. N., Smimitsky, V. A., Terekhov, Yu. V., and Paryev, E. Ya.
- Subjects
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BARYONS , *NUCLEAR reactions , *ANTIPROTONS , *NUCLEAR matter , *PHYSICS laboratories , *NUCLEAR cross sections , *LONGITUDINAL method - Abstract
Inclusive cross sections σA = Ed3α(X, P21)/d3p of antiproton and negative pion production on Be, Al, Cu, and Ta targets hit by 10-GeV protons were measured at the laboratory angles of 10.5° and 59°. Antiproton cross sections were obtained in both kinematically allowed and kinematically forbidden regions for antiproton production on a free nucléon. The antiproton cross-section ratio as a function of the longitudinal variable X exhibits three separate plateaus, which gives evidence for the existence of compact baryon configurations in nuclei--small-distance scaled objects of nuclear structure. The comparability of the measured cross-section ratios with those obtained in the inclusive electron scattering off nuclei suggests weak antiproton absorption in nuclei. Observed behavior of the cross-section ratios is interpreted in the framework of a model considering the hadron production as a fragmentation of quarks (antiquarks) into hadrons. It has been established that the antiproton formation length in nuclear matter can reach the magnitude of 4.5 fm. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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