Spin of protons in NICA and PTR storage rings as an axion antenna

Abstract

We discuss a new approach to search for axions in the storage ring experiments, applicable at short coherence time of the in-plane polarization as is the case for protons. The technique can readily be applied at any storage ring equipped with internal polarimeter for the radial polarization of the beam (COSY, NICA, PTR). We point out a possibility of substantial broadening of the range of attianable axion masses in storage rings with the hybrid electric and magnetic bending, the PTR proton storage ring being an example.