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Spin-triplet final-state dominance in the pp -> pn pi+ reaction at 492 MeV | | V.Abaev
; M.Buescher
; S.Dymov
; M.Hartmann
; A.Kacharava
; V.I.Komarov
; V.Koptev
; V.Kurbatov
; S.Mikirtychiants
; M.Nekipelov
; A.Petrus
; H.Stroeher
; Yu.N.Uzikov
; C.Wilkin
; S.Yaschenko
; | | Date: |
8 May 2001 | | Journal: | Phys.Lett. B521 (2001) 158-164 | | Subject: | nucl-ex | | Abstract: | 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. | | Source: | arXiv, nucl-ex/0105002 | | Services: | Forum | Review | PDF | Favorites | |
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