Abstract
Wolfenstein parameters D, R and A' are sensitive to the meson-exchange mechanism of inelastic scattering of protons by nuclei, A(p,p')A*. Measurement of these parameters at momentum transfer q=(1.5-3)mpi would be a sensitive test of critical opalescence (i.e. the proximity of a pion condensate) in nuclei. At centre-of-mass scattering angle theta , the signature of pi exchange is D=-1, R=cos 1/2 theta , A'=-cos 1/2 theta , while the signature of the principle background, rho exchange, is D=A'=0, R=-cos 1/2 theta .
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