On meson-exchange and Delta-isobar currents in the two-nucleon photoabsorption mechanism - INSPIRE

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On meson-exchange and Delta-isobar currents in the two-nucleon photoabsorption mechanism

Dec, 1994

26 pages

Published in:

Nucl.Phys.A 580 (1994) 551-576

DOI:

10.1016/0375-9474(94)90781-1

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Abstract: (Elsevier)

The role of π- and ϱ-meson exchange currents and dynamic Δ-isobar currents with both π- and ϱ-exchange are studied in two-nucleon knockout reactions. The Gottfried approximation is tested for these different absorption mechanisms by making a comparison between a factorized (Gottfried) model and an unfactorized model. For the unfactorized model, analytical expressions are given for the different absorption mechanisms by using harmonic-oscillator wavefunctions. The formalism is applied to the 16 O(γ,pn) reaction in the photon-energy range E γ = 60–300 MeV. Over the whole energy range, the ϱ-meson degree of freedom is found not to be negligible. It is demonstrated that the unfactorized treatment leads to a sizeable reduction of the cross section and to a change of the shape of the angular cross section.

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