/ Experiment-Nucl arXiv:0902.1423


Polarizing a stored proton beam by spin flip?


Oellers, D. (JCHP, Julich) ; Barion, L. (INFN, Ferrara) ; Barsov, S. (St. Petersburg, INP) ; Bechstedt, U. (JCHP, Julich) ; Benati, P. (INFN, Ferrara) ; Bertelli, S. (INFN, Ferrara) ; Chiladze, D. (Tbilisi State U.) ; Ciullo, G. (INFN, Ferrara) ; Contalbrigo, M. (INFN, Ferrara) ; Dalpiaz, P.F. (INFN, Ferrara) ; Dietrich, J. (JCHP, Julich) ; Dolfus, N. (JCHP, Julich) ; Dymov, S. (Dubna, JINR) ; Engels, R. (JCHP, Julich) ; Erven, W. (JCHP, Julich) ; Garishvili, A. (Erlangen - Nuremberg U.) ; Gebel, R. (JCHP, Julich) ; Goslawski, P. (Munster U.) ; Grigoryev, K. (JCHP, Julich) ; Hadamek, H. (JCHP, Julich) ; Kacharava, A. (JCHP, Julich) ; Khoukaz, A. (Munster U.) ; Kulikov, A. (Dubna, JINR) ; Langenberg, G. (JCHP, Julich) ; Lehrach, A. (JCHP, Julich) ; Lenisa, P. (INFN, Ferrara) ; Lomidze, N. (Tbilisi State U.) ; Lorentz, B. (JCHP, Julich) ; Macharashvili, G. (Dubna, JINR) ; Maier, R. (JCHP, Julich) ; Martin, S. (JCHP, Julich) ; Merzliakov, S. (JCHP, Julich) ; Meshkov, I.N. (Dubna, JINR) ; Meyer, H.O. (Indiana U.) ; Mielke, M. (Munster U.) ; Mikirtychiants, M. (JCHP, Julich) ; Mikirtychiants, S. (JCHP, Julich) ; Nass, A. (Erlangen - Nuremberg U.) ; Nekipelov, M. (JCHP, Julich) ; Nikolaev, N.N. (Landau Inst.) ; Nioradze, M. (Tbilisi State U.) ; d'Orsaneo, G. (JCHP, Julich) ; Papenbrock, M. (Munster U.) ; Prasuhn, D. (JCHP, Julich) ; Rathmann, F. (JCHP, Julich) ; Sarkadi, J. (JCHP, Julich) ; Schleichert, R. (JCHP, Julich) ; Smirnov, A. (Dubna, JINR) ; Seyfarth, H. (JCHP, Julich) ; Sowinski, J. (Indiana U.) ; Spoelgen, D. (JCHP, Julich) ; Stancari, G. (INFN, Ferrara) ; Stancari, M. (INFN, Ferrara) ; Statera, M. (INFN, Ferrara) ; Steffens, E. (Erlangen - Nuremberg U.) ; Stein, H.J. (JCHP, Julich) ; Stockhorst, H. (JCHP, Julich) ; Straatmann, H. (JCHP, Julich) ; Stroher, H. (JCHP, Julich) ; Tabidze, M. (Tbilisi State U.) ; Tagliente, G. (INFN, Bari) ; Thorngren Engblom, P. (Stockholm U.) ; Trusov, Sergey V. (SINP, Moscow) ; Vasilyev, A. (St. Petersburg, INP) ; Weidemann, Chr. (JCHP, Julich) ; Welsch, D. (JCHP, Julich) ; Wieder, P. (JCHP, Julich) ; Wustner, P. (JCHP, Julich) ; Zupranski, P. (Warsaw, Inst. Nucl. Studies)

Published in: Phys.Lett.
Year: 2009
Vol.: B674
Page No: 269-275
Pages: 18

Abstract: We discuss polarizing a proton beam in a storage ring, either by selective removal or by spin flip of the stored ions. Prompted by recent, conflicting calculations, we have carried out a measurement of the spin flip cross section in low-energy electron-proton scattering. The experiment uses the cooling electron beam at COSY as an electron target. The measured cross sections are too small for making spin flip a viable tool in polarizing a stored beam. This invalidates a recent proposal to use co-moving polarized positrons to polarize a stored antiproton beam.

Keyword(s): Polarized beams ; Storage rings ; Electron-proton scattering ; Antiprotons

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