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First measurement of the pdashp → ndashn depolarization parameter D0n0n at 546 and 875 MeV /c

A Ahmidouch,E Heer,R Hess,C Lechanoineleluc,C Mascarini,D Rapin,R Birsa,F Bradamante,A Bressan,S Dalla Torrecolautti,M A Giorgi,M Lamanna,A Martin,A Penzo,P Schiavon,F Tessarotto,M P Macciotta,A Masoni,G Puddu,S Serci,T Niinikoski,A Rijllart,H Catz,J Faivre,F Perrotkunne,J Arvieux,R Bertini,R A Kunne,M Agnello,Felice Iazzi,Bruno Minetti,T Bressani,E Chiavassa,N De Marco,A Musso,A Piccotti

Nuclear Physics B（1995）

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Abstract
The depolarization parameter Donon of the pdashp → ndashn charge exchange reaction has been measured for the first time at the CERN Low Energy Antiproton Ring (LEAR) at two antiproton momenta, 546 and 875 MeV/c. The transverse polarization of the recoil neutron was analyzed using a large-acceptance neutron polarimeter made up of two parallel plastic scintillator planes. D0n0n is usually less than 0.35 which suggests that the spin-spin amplitudes dominate in the scattering matrix. Results are compared with the predictions of various NdashN potential models. The agreement is in general satisfactory.
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