Abstract
The photon asymmetry ( Σ) of the 12 C( γ → ,pn) reaction has been measured using linearly polarised tagged photons at the Mainz microtron MAMI for E γ =180–340 MeV. The data have been analysed in separate missing energy ( E m) regions corresponding to the ejection of nucleons from (1p) 2 and (1p)(1s) shells. The measured Σ values for both E m regions are smaller in magnitude than corresponding 2 H data, but the (1p) 2 results have a similar E γ dependence. Calculations of direct two-nucleon emission overestimate the magnitude of Σ at all photon energies.
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