Analysing powers for the reaction $\vec{\mathrm{n}}\mathrm{p}\to \mathrm{p}\mathrm{p}{\pi }^{-}$ and for np elastic scattering from 270 to 570 MeV

Abstract

The analysing power of the reaction $\mathrm{n}\mathrm{p}\to \mathrm{p}\mathrm{p}{\pi }^{-}$ for neutron energies between threshold and 570 MeV has been determined using a transversely polarised neutron beam at PSI. The reaction has been studied in a kinematically complete measurement using a time-of-flight spectrometer with large acceptance. Analysing powers have been determined as a function of the c.m. pion angle in different regions of the proton-proton invariant mass. They are compared to other data from the reactions $\mathrm{n}\mathrm{p}\to \mathrm{p}\mathrm{p}{\pi }^{-}$ and $\mathrm{p}\mathrm{p}\to \mathrm{p}\mathrm{p}{\pi }^0$. The np elastic scattering analysing power was determined as a by-product of the measurements.

12 pages, 6 figures, subitted to EPJ-C

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