arXiv 1204.60022012-04-26physics.acc-phhep-exnucl-ex

Higher Order Spin Resonances in a 2.1 GeV/c Polarized Proton Beam

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

备注：: 5 pages, 5 figures Note that Fig. 5 did not appear in the PRL due to space limitation, but did appear in the March 2012 CERN Courier News Item "Results from SPIN@COSY may bode well for RHIC"
发表信息：: Physical Review Letters 108, 074801 (2012)
DOI：: 10.1103/PhysRevLett.108.074801

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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 (νy) resonance caused almost full spin-flip, while some higher order νy resonances caused partial depolarization. The 1st order horizontal (νx) resonance caused almost full depolarization, while some higher order νx resonances again caused partial depolarization. Moreover, a 2nd order νx resonance is about as strong as some 3rd order νx resonances, while some 3rd order νy resonances are much stronger than a 2nd order νy resonance. One thought that νy spin resonances are far stronger than νx, and that lower order resonances are stronger than higher order; the data do not support this.

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