Polarizing a stored proton beam by spin flip?

Abstract

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.

18 pages, 6 figures

References in corpus (8)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Polarizing mechanisms for stored $p$ and $\bar{p}$ beams interacting with a polarized target
• Polarization effects in non-relativistic $ep$ scattering
• Spin effects in $p\bar{p}$ interaction and their possible use to polarize antiproton beams
• A surprising method for polarising antiprotons
• Polarizing Stored Beams by Interaction with Polarized Electrons
• Dynamics of polarization buildup by spin filtering
• Coulomb effects in polarization transfer in elastic antiproton and proton electron scattering at low energies

Cited by in corpus (6)

• Toward polarized antiprotons: Machine development for spin-filtering experiments
• Model independent analysis of polarization effects in elastic proton-electron scattering
• Polarization observables in low-energy antiproton-proton scattering
• Proton electron elastic scattering and the proton charge radius
• The Beauty of Spin
• Kinetics of polarization in non-relativistic scattering