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Springer series on atomic, optical, and plasma physics

Measurements of Photon Polarization and Angular Correlations for He4-He Collisions Coincidence Technique Using an Ion-Photon

G. Vassilev, G. Rahmat, J. A. Slevin, J. Baudon

Published Jan 1, 2001• 0 citations
Publisher
DOI
10.1007/978-1-4613-0187-5_33

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hep-phCross-listedarXiv:2601.22212•Jan 30, 2026
Measurements have been made of the polarization of characteristic radiation of excited states, formed in charge exchange collisions, in delayed time coincidence with the neutral particles formed and scattered during the collision. Such information directly provides ratios of populations of orbital magnetic sublevels and phase differences between scattering amplitudes. This relative phase data, in conjunction with an appropriate model of the collision process, has provided insights into the evolution of the electronic charge distribution during the collision process. These techniques are also being applied to ion-molecule charge transfer collisions.
Three techniques are described from which the scattering parameters A and X can be measured in electron-photon coincidence studies of the 32P state of sodium. The relative sensitivity of the angular correlation and polarized photon techniques is discussed for states which have significant hyperfine structure in the excited state. The phenomenon of zero field quantum beats is described in the framework of the electron impact excitation of sodium. It is shown that the amplitude of the beat pattern depends on the parameter it. The use of the beat pattern to determine A is discussed.
Ultra-peripheral collisions (UPCs) involving relativistic heavy ions are a unique laboratory to study quantum correlations. The intense electromagnetic fields generate high rates of photonuclear interactions, including events involving multiple photon exchange. Multiple photon exchange can result in the production of multiple vector mesons and/or nuclear excitations. These interactions share a common impact parameter, so the photons have the same linear polarization. The shared polarization entangles the particles, leading to unique quantum correlations. The decays of these vector excitations are sensitive to this polarization, allowing for the study of these correlations. This letter will compare classical and quantum calculations of the correlations between these azimuthal directions. The two approaches predict vert different angular correlations. The differences are akin to those seen with polarized photons in tests of Bells inequality. Uniquely, UPC photoproduction can produce final states containing three or more particles, all entangled with the same polarization. These more complex states exhibit additional unique phenomenology, allowing new tests of multi-particle entanglement.