Volume 433 - 19th Workshop on Polarized Sources, Targets and Polarimetry (PSTP2022) - Session 14
Proposed experimental study of wave-particle duality in $p,p$ scattering
R. Talman* and N. Co-authors
Full text: Not available
Abstract
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.
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This paper argues initially that correct calculation of the spin dependence of $p,p$
(and other charged particle) elastic scattering must account for a previously-neglected relativistic effect
of $G$'', the anomalous magnetic dipole moment (MDM) of the scattering particles. The paper then precedes
to describe storage ring $p,p$ scattering configurations capable of confirming this contention.
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Especially important experimentally for protons is the existence of perfect'' (greater than 99\%)
proton-carbon scattering polarimetric analyzing power $A$ at $K=183.1$\,MeV laboratory kinetic energy
and nearly as high nearby.
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Possibilities:
(i) In a storage ring collider with counter-circulating proton beams, each with, say,
$K=200\,$MeV energy, the final spin states of coincident scattered protons can be determined
with high probability for a significantly large fraction of all scatters, both prompt and delayed.
For comparison with current descriptions based on proton scattering from a hydrogen target fixed in the
laboratory, this corresponds roughly, to proton kinetic energy $K=400\,$MeV in the laboratory frame,
close to the pion production threshold.
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(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 $K''\approx200$ MeV energies
in a slow, transversely moving frame.
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(iii) As another compromise, $p$ 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 (at the cost of significantly inferior polarimetry for the deuteron beam).
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To investigate the consistency of quantum mechanics and special relativity it is proposed to implement
options (ii) and (iii) in the COSY beam hall.
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