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A first measurement of longitudinal as well as transverse spin correlationcoefficients for the reaction $\vec{p}\vec{p}\to pn\pi^+$ was made using apolarized proton target and a polarized proton beam. We report kinematicallycomplete measurements for this reaction at 325, 350, 375 and 400 MeV beamenergy. The spin correlation coefficients $A_{xx}+A_{yy}, A_{xx}-A_{yy},A_{zz}, A_{xz},$ and the analyzing power $A_{y},$ as well as angulardistributions for $\sigma(\theta_{\pi})$ and the polarization observables$A_{ij}(\theta_{\pi})$ were extracted. Partial wave cross sections for dominanttransition channels were obtained from a partial wave analysis that includedthe transitions with final state angular momenta of $l\leq 1$. The measurementsof the ${\vec{p}\vec{p}\to pn\pi^{+}}$ polarization observables are comparedwith the predictions from the J\"ulich meson exchange model. The agreement isvery good at 325 MeV, but it deteriorates increasingly for the higher energies.At all energies agreement with the model is better than for the reaction${\vec{p}\vec{p}\to pp\pi^{0}}$.Comment: Preprint, 21 pp, submitted to Phys. Rev. C. Keywords: Mesons,  Polarization, Spin Correlations, Few body system

physical review. c. nuclear physics/physical review. c, nuclear physics

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Spin correlations inp→p→→pnπ+