Measurement of color transparency by C(p,2p) reactions at large momentum transfer

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The subject of color transparency, the enhancement of the ability of hadrons to penetrate nuclear matter by kinematic selection, is both interesting and controversial. The description of the collision of hadrons with nucleons inside nuclei, and the connection with initial and final state interactions involve fundamental questions of quantum mechanics, and nuclear and particle physics. Interest in color transparency was greatly increased by AGS Experiment 834 which observed dramatic changes with incident momentum for a variety of nuclei. A new experiment, E850, has studied the (p,2p) quasi-elastic reaction near 90{degree} cm for momenta between 5.9 and 9 GeV/c. The quasi-elastic ... continued below

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6 p.

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Carroll, A.S. & Collaboration, E850 December 1, 1997.

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Description

The subject of color transparency, the enhancement of the ability of hadrons to penetrate nuclear matter by kinematic selection, is both interesting and controversial. The description of the collision of hadrons with nucleons inside nuclei, and the connection with initial and final state interactions involve fundamental questions of quantum mechanics, and nuclear and particle physics. Interest in color transparency was greatly increased by AGS Experiment 834 which observed dramatic changes with incident momentum for a variety of nuclei. A new experiment, E850, has studied the (p,2p) quasi-elastic reaction near 90{degree} cm for momenta between 5.9 and 9 GeV/c. The quasi-elastic reaction was compared to the elastic reaction on free protons to determine the transparency. With limited statistics, but with better kinematic definition in a new detector, the authors have confirmed the rise in Carbon transparency ratio seen in Expt 834. The Tr(D/H) for deuterium is consistent with no energy dependence. Unlike the free d{sigma}/dt for hydrogen, the d{sigma}/dt from protons in a nucleus is consistent with the exact s{sup {minus}10} scaling. This suggests two components to the pp scattering amplitude; one small and perturbative, the other spatially large and varying, but filtered away by the nuclear matter in the Carbon nucleus. The plan is to complete the repairs of the superconducting solenoid early this fall, reassemble the detector, and collect data starting next spring.

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6 p.

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INIS; OSTI as DE98004428

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  • Hadron `97. 7th international conference on hadron spectroscopy, Upton, NY (United States), 28-30 Aug 1997

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  • Other: DE98004428
  • Report No.: BNL--65030
  • Report No.: CONF-970842--
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 658356
  • Archival Resource Key: ark:/67531/metadc702104

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 1997

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 9, 2015, 1:05 p.m.

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Carroll, A.S. & Collaboration, E850. Measurement of color transparency by C(p,2p) reactions at large momentum transfer, article, December 1, 1997; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc702104/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.