  The measured nuclear transparencies in targets of Li, C, Al, Cu and Pb at
incident momenta of 6, 10, and 12 GeV/c have been used to study the rate of
proton expansion connected with (p,2p) quasielastic scattering at large
momentum transfer. Simple models with linear or quadratic expansion of the
effective cross section fail to simultaneously fit the measured transparencies
at all three momenta. If only the 6 and 10 GeV/c transparencies are fitted,
satisfactory representations can be obtained when the expansion distances for
protons at 6 GeV/c are greater than 6.4 fm(linear) and 4.0 fm(quadratic). These
distances are greater than those suggested by most Expansion models except the
quadratic 'naive expansion' picture. However, the transparencies are well
represented by the Nuclear Filtering model with no explicit expansion.
