Backwardπ−preactions between 0.6 and 1.0 GeV/c

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Abstract

Measurements are reported of the differential cross section for the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}p,{\ensuremath{\pi}}^{0}n,\mathrm{and}\ensuremath{\eta}n$ at three angles close to 180\ifmmode^\circ\else\textdegree\fi{} and for incident momenta in the range 0.6 to 1.0 GeV/c. The three measurements were made simultaneously at 1% intervals of beam momentum. The data on elastic scattering resolve a discrepancy between two earlier experiments. They also show clearly the effect of the opening of the $\ensuremath{\eta}n$ channel. The charge-exchange data show that $I$-spin bounds are not violated in the kinematic region covered. The $\ensuremath{\eta}n$ data can be adequately described with known $s$-channel resonances. No evidence for narrow ${N}^{*}'\mathrm{s}$ is seen in any channel.

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