Spin-triplet final-state dominance in the pp -> pn pi+ reaction at 492 MeV

Details Spin-triplet final-state dominance in the pp -> pn pi+ reaction at 492 MeV Spin-triplet final-state dominance in the pp -> pn pi+ reaction at 492 MeV

2001-05-08

arxiv.org/abs/nucl-ex/0105002v2

Phys.Lett.B521:158-164,2001

Physics

Nuclear Physics

Nuclear Experiment

10 pages, 4 figures

Scientific paper

10.1016/S0370-2693(01)01229-1

The near-forward cross section for the pp -> pn pi^+ reaction has been measured at 492 MeV by using the large acceptance ANKE magnetic spectrometer placed at an internal target position of the storage ring COSY-Juelich. Protons and pions emitted near zero degrees were detected in coincidence, and those with theta_pi <= 2 degrees and theta_p <= 2.5degrees were subjected to detailed analysis. Under these conditions, the excitation energy in the np system was below 3 MeV over the measured momentum range. This is the region of the np final-state-interaction peak, which was measured with a resolution of a fraction of an MeV. The shape of the peak allows one to conclude that the fraction of final spin-singlet np pairs is below about 10%. By using the results of scattering theory, this limit is confirmed through a comparison with the cross section for pp -> d pi^+. The smallness of the singlet contribution is consistent with trends seen in lower energy data.

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