Photon polarization in theHe4(γ,d→)2H reaction

Abstract
We derive double polarization observables for the photodisintegration of He4 with an incident polarized photon beam. In particular we study the effect of the ground state α-particle D wave on these observables in a simple nuclear model. We find that in general the double polarization observables offer no clear advantage to the corresponding variables studied in the single polarization He4(γ,d)2H reaction. However, the photon asymmetry Σ appears as a promising observable for the study of ground state effects.

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