Polarizing a stored proton beam by spin flip?

D. Oellers , L. Barion , S. Barsov , U. Bechstedt , P. Benati , S. Bertelli , D. Chiladze , G. Ciullo

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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 G. Langenberg A. Lehrach P. Lenisa N. Lomidze B. Lorentz G. Macharashvili R. Maier S. Martin S. Merzliakov I.N. Meshkov 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 A. Smirnov H. Seyfarth J. Sowinski D. Spoelgen G. Stancari M. Stancari M. Statera E. Steffens H.J. Stein H. Stockhorst H. Straatmann H. Stroeher M. Tabidze G. Tagliente P. Thoerngren Engblom S. Trusov A. Vasilyev Chr. Weidemann D. Welsch P. Wieder P. Wuestner P. Zupranski

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classification ⚛️ nucl-ex

keywords beamflipspinstoredpolarizingcrosselectronproton

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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.

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Polarizing a stored proton beam by spin flip?

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