(gamma,np) reactions in 12C , 6Li and 3,4He

Authors :: Dancer, S.N.
MacGregor, I.J.D.
Annand, J.R.M.
Anthony, I.
Crawford, G.I.
Doran, S.
Hall, S.J.
Kellie, J.D.
McGeorge, J.C.
Owens, R.O.
Wallace, P.A.
Branford, D.
Springham, S.V.
Shotter, A.C.
Beck, R.
Gothe, R.
Kalleicher, F.
Liesenfeld, G.
Schmieden, H.
Schoch, B.
Vogt, J.
Zettl, F.
Klein, S.
Drechsel, D
Walcher, Th
Source :: Physics with MAMI-A
Publication Year :: 1988
Publisher :: Institut fuer Kernphysik, Johannes Gutenberg Universitaet Mainz, 1988.
Abstract: The emission of neutron-proton pairs is the most probable outcome of photon absorbtion in the energy region above the giant resonance at least up to the pion threshold, but little detailed information on the process has been obtained due to experimental difficulties. Two nucleon emission following photon absorbtion by a correlated pair is favoured\ud compared to direct knockout of a single nucleon, which is suppressed by the large momentum mismatch between the ingoing photon and a single outgoing fast nucleon. Studies of the (gamma,np) process seek firstly to obtain a quantitative \ud understanding of the photon interaction mechanism, and through this to open the door to investigations of nucleon\ud correlations in nuclei [1], information about which is long sought but not readily obtainable.