Abstract
We have evaluated the cross section for coherent pion production in the 3 He + 12 C → t + 12 C + π + reaction. The Δ peak of the energy distribution is considerably shifted with respect to the peak in the p( 3 He,t)Δ ++ reaction. The coherent pions represent a sizable fraction of all pions produced and are a major ingredient in the interpretation of the shift of the Δ peak in the inclusive ( 3He,t ) reaction in nuclei. The coherent production process qualifies as production of virtual pions followed by elastic scattering of the virtual pions with the nucleus and the investigation of this channel will offer information about pion nucleus interaction complementary to the one obtained from scattering of real pions.
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