2023/02/07 by R. Talman, Talman, Richard M
Engineering · Physics and Astronomy · #Accelerator Physics (physics.acc-ph) #FOS: Physical sciences #Particle Accelerators and Free-Electron Lasers #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2302.03557
openalex publication_date 2023/02/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Of all nuclear physics experiments none are more fundamental than ``elastic'' p,p and, secondarily, p,d or d,d scattering. Recognizing that these particles are themselves composite, ``elastic'' scattering may be accompanied by temporary internal rearrangement with undetectably small energy loss. % This paper argues that correct calculation of the spin dependence of p,p elastic scattering must account for a previously-neglected relativistic effect of ``G'', the anomalous magnetic dipole moment (MDM) of the scattering particles and proceeds to describe storage ring p,p scattering configurations capable of confirming this contention. % Especially important experimentally for protons is the existence of ``near perfect'' proton-carbon scattering polarimetric analyzing power A near K=183.1 MeV laboratory kinetic energy. % Possibilities: (i) With counter-circulating K=200 MeV energy proton beams the final spin states of coincident scattered protons can be determined with high probability for a significantly large fraction of all scatters. For comparison with current descriptions this corresponds roughly to proton kinetic energy K=400 MeV in the laboratory frame, close to the pion production threshold. % (ii) In a ``DERBENEV-style'' figure-8 storage ring, independently polarized, diametrically opposite bunches on orthogonal orbits can collide at the beam crossover point with symmetric K''≈200 MeV energies in a slow, transversely moving frame. % (iii) p and d beams can counter-circulate at the same time in a small racetrack shaped ring with superimposed electric and magnetic bending. In this case the scattering would be ``WOLFENSTEIN-style'' with collinear incident orbits. % To investigate the consistency of quantum mechanics and special relativity it is proposed to implement options (ii) and (iii) in the COSY beam hall.