Author/Authors :
A. Ahmidouch، نويسنده , , R. Bertini، نويسنده , , R. Birsa، نويسنده , , F. Bradamante، نويسنده , , Rodrigo A. Bressan، نويسنده , , S. Dalla Torre-Colautti، نويسنده , , M. Giorgi، نويسنده , , E. Heer، نويسنده , , R. Hess، نويسنده , , F. Iazzi، نويسنده , , M. Lamanna، نويسنده , , C. Lechanoine-Leluc، نويسنده , , A. Martin، نويسنده , , G. Puddu ، نويسنده , , D. Rapin، نويسنده , , P. Schiavon، نويسنده , , F. Tessarotto، نويسنده ,
Abstract :
The spin-transfer parameter Kn00n of the pp↑ → n↑n charge exchange reaction has been measured for the first time at the CERN Low Energy Antiproton Ring (LEAR), at 875 MeV/c p momentum, in the centre-of-mass scattering-angle range from 45° to 78°. To measure the transverse polarisation of the nʹs, a thick scintillator counter hodoscope was used as live target, and the elastic np scattering on the hydrogen of the scintillator was used as analysing reaction of the n transverse polarisation. Its so far unmeasured analysing power is taken as linear in momentum transfer, Anp = α·q, and results are given for α·Kn00n. The values one obtains for Kn00n, estimating α from NN potential models, are less than 0.25, in agreement with the predictions.
