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Elastic scattering of polarized photons

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Il Nuovo Cimento (1955-1965)

Summary

Rayleigh’s cross-section for a partially polarized photon beam may be expressed as: dσ/dω = dσ0/dω +dgx(dσ1/dω), where dσ0/dΩ is the term resulting from the non-polarized component and dσ1/dω that due to polarization, ξ being the beam polarization degree in respect to the scattering plane. By polarizing a photon beam through a Compton scattering, a given Rayleigh scattering angle ϕ being fixed, an asymmetry ratio may be defined by:R= (dσ0/dω+ξ(dσ1/dω))/(dσ0/dω+ ξtT(dσ1/dω)), where the numerator is Rayleigh’s cross-section for the angle ϕ in the Compton scattering plane, and the denominator is the same cross-section in the plane perpendicular to the Compton scattering one.R has been measured in the polarized photon elastic scattering, by using photons with a 0.64mc2 energy scattered on Hg with a ϕ ∼ 90° angle. The experimental results appear to be in conformity with the theoretical previsions.

Riasstinto

La sezione d’urto Rayleigh, per un fascio di fotoni parzialmente polarizzati, può mettersi nella forma:dσ/dω = dσ0/dω + ξ(dσ1/dω), dove dσ0/dω è il termine dovuto alla componente non polarizzata e ξ(dσ1/dω) è il termine dovuto alla polarizzazione, ξ essendo il grado di polarizzazione del fascio rispetto al piano dello scattering. Polarizzando un fascio di fotoni con uno scattering Compton e fissato un certo angolo di scattering Rayleigh ϕ, si può definire un rapporto di asimmetria ponendoR = (dσ/dω + ξ ( 1/dσ1/dω))/ξ ( 1/dσ0/dω))/ξ ( 1/dσ1/dω)), dove il numeratore è la sezione d’urto Rayleigh per l’angolo ϕ nel piano di scattering Compton ed il denominatore la stessa sezione d’urto nel piano perpendicolare a quello di scattering Compton. È stata eseguita una misura diR nello scattering elastico di fotoni polarizzati usando fotoni di energia 0,64mc 2scatterati su Hg con un angolo di scattering ϕ = 90°. I risultati sperimentali si mostrano in buon accordo con le previsioni teoriche.

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Brini, D., Fuschini, E., Peli, L. et al. Elastic scattering of polarized photons. Nuovo Cim 7, 877–890 (1958). https://doi.org/10.1007/BF02745592

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  • DOI: https://doi.org/10.1007/BF02745592

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