Abstract
A detailed investigation of the reaction np $ \rightarrow$ pp $ \pi^{{-}}_{}$ has been carried out using the data obtained with the continuous neutron beam produced by charge exchange scattering of protons off the deuterium target. Partial-wave event-by-event analysis based on the maximum likelihood method was applied to determine contributions of different partial waves to the pion production process. A combined analysis of the np $ \rightarrow$ pp $ \pi^{{-}}_{}$ and pp $ \rightarrow$ pp $ \pi^{{0}}_{}$ data measured in the same energy region allows us to determine the contribution of isoscalar partial waves (I = 0 in the momentum range from 1.1 up to 1.8GeV/c . The decay of isoscalar partial waves into the (1 S 0)pp $ \pi$ channel provides us with a good tool for the determination of the pp S -wave scalar scattering length in the final state which was found to be a pp = - 7.5±0.3 fm.
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