Polarizing a stored proton beam by spin flip?

Details Polarizing a stored proton beam by spin flip? Polarizing a stored proton beam by spin flip?

2009-02-09

arxiv.org/abs/0902.1423v1

Phys.Lett.B674:269-275,2009

Physics

Nuclear Physics

Nuclear Experiment

18 pages, 6 figures

Scientific paper

10.1016/j.physletb.2009.03.037

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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