Azimuthal angle distributions of neutrons emitted from the 9Be(γ,n) reaction with linearly polarized γ-rays

The electromagnetic transitions of 9Be with linearly polarized γ-rays are calculated by using the α + α + n three-body model and the complex-scaled solutions of the Lippmann-Schwinger equation; the azimuthal angle distributions of the emitted neutrons are investigated. We calculatethe anisotropy parameter as a function of the photon incident energy Eγ, and discuss how sensitive the anisotropy parameter is to nuclear structure and transition modes. The result suggests that the azimuthal angle distribution of neutrons emitted from the 9Be(γ,n) reaction with the linearly polarized γ-rays is useful to identify the resonances in the final states even if it is not clearly observed in the cross section