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Oellers, D.; Barion, L.; Barsov, S.; Bechstedt, U.; Benati, P.; Bertelli, S.; Chiladze, D.; Ciullo, G.; Contalbrigo, M.; Dalpiaz, P.F.; Dietrich, J.; Dolfus, N.; Dymov, S.; Engels, R.; Erven, W.; Garishvili, A.; Gebel, R.; Goslawski, P.; Grigoryev, K.; Hadamek, H.; Kacharava, A.; Khoukaz, A.; Kulikov, A.; Langenberg, G.; Lehrach, A.; Lenisa, P.; Lomidze, N.; Lorentz, B.; Macharashvili, G.; Maier, R.; Martin, S.; Merzliakov, S.; Meshkov, I.N.; Meyer, H.O.; Mielke, M.; Mikirtychiants, M.; Mikirtychiants, S.; Nass, A.; Nekipelov, M.; Nikolaev, N.N.; Nioradze, M.; d'Orsaneo, G.; Papenbrock, M.; Prasuhn, D.; Rathmann, F.; Sarkadi, J.; Schleichert, R.; Smirnov, A.; Seyfarth, H.; Sowinski, J.; Spoelgen, D.; Stancari, G.; Stancari, M.; Statera, M.; Steffens, E.; Stein, H.J.; Stockhorst, H.; Straatmann, H.; Ströher, H.; Tabidze, M.; Tagliente, G.; Engblom, P. Thörngren; Trusov, S.; Vasilyev, A.; Weidemann, Chr; Welsch, D.; Wieder, P.; Wüstner, P.; Zupranski, P.
Physics letters. B, 04/2009, Letnik: 674, Številka: 4-5Journal Article
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.
