Abstract
Photonucleon angular distributions are calculated in the j− j coupling scheme for single-particle excitations. The electromagnetic interaction of the nucleus with the photon beam is treated in electric dipole and quadrupole absorption approximations. The general results allow the extraction of information about the one-particle-one-hole transition strengths from the experimentally-measured angular distributions. The importance of the coherent interference terms in the electric dipole cross section is discussed. It is shown that, except in special cases, the amount of electric quadrupole absorption involved in photoproton production can be estimated only to the nearest order of magnitude from the asymmetry about 90° in the angular distribution. The effects of inclusion of the spin-orbit force on the interpretation by Shoda of systematics in 1d-2s shell nuclei are described briefly.
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