Energy Dependence of Nuclear Transparency in C<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mi mathvariant="italic">p</mml:mi><mml:mo>,</mml:mo><mml:mn>2</mml:mn><mml:mn /><mml:mi mathvariant="italic">p</mml:mi><mml:mo>)</mml:mo></mml:math>Scattering

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The transparency of carbon for (p,2p) quasi-elastic events was measured at beam energies ranging from 6 to 14.5 GeV at 90 degrees c.m. The four momentum transfer squared q*q ranged from 4.8 to 16.9 (GeV/c)**2. We present the observed energy dependence of the ratio of the carbon to hydrogen cross sections. We also apply a model for the nuclear momentum distribution of carbon to normalize this transparency ratio. We find a sharp rise in transparency as the beam energy is increased to 9 GeV and a reduction to approximately the Glauber level at higher energies.

4 pages, 2figures, submitted to PRL

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