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Differential Cross Section of the pn ! pp͑ ͑ ͑ 1 S 0 ͒ ͒ ͒p 2 Reaction Extracted from pd ! pppp 2The double differential cross section for pn ! pp͑ 1 S 0 ͒p 2 at three beam energies has been extracted from the quasifree process pd ! pppp 2 . A comparison is carried out with single differential cross section measurements for 3 He͑p 2 , pn͒n, where the pion is thought to be absorbed onto a pp͑ 1 S 0 ͒ "diproton" state. A significant difference is observed in the shape of the angular distribution between the production and absorption data. This difference is ascribed to the effects of the 3 He nuclear environment characterizing the absorption process; however, an adequate theoretical explanation is not available. [S0031-9007 (98)06103-1]

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