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Polarizing a stored proton beam by spin flip?

2009; Elsevier BV; Volume: 674; Issue: 4-5 Linguagem: Inglês

10.1016/j.physletb.2009.03.037

1873-2445

D. Oellers, L. Barion, S. Barsov, U. Bechstedt, P. Benati, Susanna Bertelli, D. Chiladze, G. Ciullo, M. Contalbrigo, P.F. Dalpiaz, J. Dietrich, N. Dolfus, S. Dymov, R. Engels, W. Erven, A. Garishvili, R. Gebel, P. Goslawski, K. Grigoryev, H. Hadamek, A. Kacharava, A. Khoukaz, A. Kulikov, Georg Langenberg, A. Lehrach, P. Lenisa, N. Lomidze, B. Lorentz, G. Macharashvili, R. Maier, S. Martin, S. Merzliakov, И. Н. Мешков, H. O. Meyer, M. Mielke, M. Mikirtychiants, S. Mikirtychiants, A. Nass, M. Nekipelov, N. N. Nikolaev, M. Nioradze, G. d'Orsaneo, M. Papenbrock, D. Prasuhn, F. Rathmann, J. Sarkadi, R. Schleichert, Alexander V. Smirnov, H. Seyfarth, J. Sowiński, D. Spoelgen, G. Stancari, M. Stancari, M. Statera, E. Steffens, J. Stein, H. Stockhorst, H. Straatmann, H. Ströher, M. Tabidze, G. Tagliente, P. Thörngren Engblom, S. Trusov, A. Vasilyev, C. Weidemann, D. Welsch, Philipp Wieder, P. Wüstner, P. Żuprański,

Muon and positron interactions and applications

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.