M. A. Leonova, J. A. Askari, K. N. Gordon, A. D. Krisch, J. Liu, V. S. Morozov, D. A. Nees, R. S. Raymond, D. W. Sivers, V. K. Wong, F. Hinterberger
Spin resonances can depolarize or spin-flip a polarized beam. We studied 1st and higher order spin resonances with stored 2.1 GeV/c vertically polarized protons. The 1st order vertical ({\nu}y) resonance caused almost full spin-flip, while some higher order {\nu}y resonances caused partial depolarization. The 1st order horizontal ({\nu}x) resonance caused almost full depolarization, while some higher order {\nu}x resonances again caused partial depolarization. Moreover, a 2nd order {\nu}x resonance is about as strong as some 3rd order {\nu}x resonances, while some 3rd order {\nu}y resonances are much stronger than a 2nd order {\nu}y resonance. One thought that {\nu}y spin resonances are far stronger than {\nu}x, and that lower order resonances are stronger than higher order; the data do not support this.
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http://arxiv.org/abs/1204.6002
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