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Title: The (γ,ρ) reaction at Eγ~60-MeV
Author: Ireland, David George
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1992
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Measurements of the (γ,p) reaction at photon energies around 60 MeV have been performed using ^12C, ^14N, ^27Al and ^51V as targets. The experiments used a photon tagging technique and a proton detection system consisting of hyperpure germanium and silicon strip detectors. Angular distributions of cross-sections in the range 60^o-120^o have been extracted for transitions leading to the ground state and several low lying excited states in each residual nucleus, and compared to direct knockout (DKO) model calculations. For each target, the relative population of residual nucleus states is similar to those found in (e,e'p) and (d^3He) experiments, with the exception of a peak at 6.8 MeV in the ^12C(γ,p) reaction. No evidence for similar anomalous behaviour is found in the 14N(γ,p) reaction. The DKO predictions fail to account for the magnitude of the (γ,p) data, and the need for calculations which include the effects of meson exchange, short range correlations, etc. is indicated. In the excitation spectra, structure seen at higher excitation energy is attributed to inclusive (γ,p) events. The spectra have been compared with a quasi-deuteron model calculation which assumes a (γ,np) reaction where the neutron goes undetected. The shape of the 51V(γ,p) excitation spectrum is compared to a pre-equilibrium model calculation. The results appear to indicate that two nucleon absorption of the photon is important, although the participating nucleons need not be in the same configuration as a free deuteron.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available