The (γ, p) reaction at Eγ ∼60 MeV

Ireland, D.G. et al. (1993) The (γ, p) reaction at Eγ ∼60 MeV. Nuclear Physics A, 554(2), pp. 173-188. (doi:10.1016/0375-9474(93)90337-W)

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Abstract

A study of the (γ, p) reaction on 12C, 14N, 27Al and 51V targets, at photon energies Eγ ∼60 MeV, is reported. Angular distributions in the range tp = 60°-120° are presented for transitions leading to the ground state and several low-lying states in each residual nucleus. The relative population of residual nucleus slates is similar to those found in (e, e'p) and (d, 3He) experiments, apart from the well-known exception of the peak at 6.8 MeV in the 12C(γ, p) reaction. Direct-knockout calculations fail to account for the magnitude of the (γ, p) results, which indicates the need for calculations that include effects such as meson exchange or short-range correlations. Strength seen at higher excitation energies is attributed to inclusive (γ, p) events. The excitation-energy spectra have been compared with quasi-deuteron model calculations which assume 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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ireland, Professor David
Authors: Ireland, D.G., Branford, D., Davinson, T., Davis, N.J., Macdonald, E.W., Sellin, P.J., Shotter, A.C., Terzoudi, P., Woods, P.J., Adler, J.-O., Anderson, B.-E., Isaksson, L., Nilsson, D., Ruijter, H., Sandell, A., and Schröder, B.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Nuclear Physics A
Publisher:Elsevier
ISSN:0375-9474
ISSN (Online):1873-1554

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