Dependence of the 12 C( γ, pd ) reaction on photon linear polarisation

/ Authors

D. Watts, J. Annand, R. Beck, D. Branford, D. Glazier, P. Grabmayr, K. Livingston, I. MacGregor, J. Mcgeorge, R. Owens

/ Abstract

Abstract The sensitivity of the C 12 ( γ → , pd ) reaction to photon linear polarisation has been determined at MAMI, giving the first measurement of the reaction for a nucleus heavier than 3He. Photon asymmetries and cross sections were measured for E γ = 170 to 350 MeV. For E γ below the Δ resonance, reactions leaving the residual 9Be near its ground state show a positive asymmetry of up to 0.3, similar to that observed for 3He suggesting a similar reaction mechanism for the two nuclei.

Journal: Physics Letters B

DOI: 10.1016/j.physletb.2007.02.013