Dependence of the $^{12}$C($\vecγ$,pd) reaction on photon linear polarisation

Watts, D. P.; Annand, J. R. M.; Beck, R.; Branford, D.; Glazier, D.; Grabmayr, P.; Livingston, K.; Macgregor, I. J. D.; Mcgeorge, J. C.; Owens, R. O.

Dependence of the $^{12}$C($\vecγ$,pd) reaction on photon linear polarisation

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Description

The sensitivity of the $^{12}$C$(\vecγ,pd)$ reaction to photon linear polarisation has been determined at MAMI, giving the first measurement of the reaction for a nucleus heavier than $^{3}$He. 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 $^{9}$Be near its ground state show a positive asymmetry of up to 0.3, similar to that observed for $^{3}$He suggesting a similar reaction mechanism for the two nuclei.
4 pages, 2 figures