Study of 12C((γ)over-Right-arrow, P)11 B Reactions with Polarized Photons at Energy 40-65 MeV

The photon beam asymmetry of the C-12((gamma) over right arrow, p(01))(11) B and C-12((gamma) over right arrow, p(2-6))(11) B reactions has been measured in the energy range 40-65 MeV, using a tagged, linearly-polarized photon beam at the MAX-lab facility in Sweden. The asymmetry of the C-12((gamma) over right arrow, p(01))(11) B reaction to ground and first excited state of (11) B is Sigma approximate to 0.82 over the measured energy range. The main contribution to the C-12((gamma) over right arrow, p(2-6))(11) B reaction to higher excited states comes from processes in which the residual nucleus is in the 3/2(-)(5.02MeV) or 7/2(-)(6.74MeV) excited states. The asymmetry of this reaction is Sigma approximate to 0.6, close to the value for free deuteron photodisintegration.