Nuclear transparency to large-angle pp elastic scattering

A. S. Carroll, D. S. Barton, G. Bunce, S. Gushue, Y. I. Makdisi, S. Heppelmann, H. Courant, G. Fang, K. J. Heller, M. L. Marshak, M. A. Shupe, J. J. Russell

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Abstract

Large-angle pp elastic and quasielastic (p,2p) scattering have been simultaneously observed in hydrogen and each of several nuclear targets (Li, C, Al, Cu, Pb) at incident proton momenta of 6, 10, and 12 GeV/c. The nuclear transparency is the ratio of such a cross section in a nucleus to the free pp cross section. The transparency of aluminum increases with incident momentum by more than a factor of 2 from 6 to 9.5 GeV/c and falls significantly between 9.5 and 12 GeV/c. This occurs in a region where the free-proton nucleon-absorption cross section exhibits little energy dependence. QCD predicts an increase in transparency with energy.

Original languageEnglish (US)
Pages (from-to)1698-1701
Number of pages4
JournalPhysical Review Letters
Volume61
Issue number15
DOIs
StatePublished - Jan 1 1988

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Carroll, A. S., Barton, D. S., Bunce, G., Gushue, S., Makdisi, Y. I., Heppelmann, S., Courant, H., Fang, G., Heller, K. J., Marshak, M. L., Shupe, M. A., & Russell, J. J. (1988). Nuclear transparency to large-angle pp elastic scattering. Physical Review Letters, 61(15), 1698-1701. https://doi.org/10.1103/PhysRevLett.61.1698