Abstract
The surface response for charge exchange (p, n) and (3He, T) reactions is studied in theΔ-region using the semi-infinite slab model. The contribution to the total response from different decay channels, (NN, Nπ, π), is calculated. These decay channels corresponds to the exclusive channels, (pp, pπ +, π+), measured in recent (p, n) and (3He, T) experiments. The in-medium properties of theΔ-resonance is taken into account by using microscopic calculations of theΔ-width in nuclear matter. From theΔ-width in nuclear matter a non-local imaginaryΔ-potential, as well as a local potential, is constructed for the semi-infinite slab model. The results in the semi-infinite slab model gives a qualitative understanding of the exclusive experiments. The exclusive (NN, Nπ, π) channels are more sensitive, than the total response, tog′-correlation parameters,Δ-width and the absorption function used at the external vertex. Our calculations suggest low values of theg′-correlation parametersg′ NΔ andg′ ΔΔ, (∼0.3). The results with theΔ-width represented as a non-local or a localΔ-potential are very similar, with only minor differences in the exclusive channels.
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Supported in part by the Swedish Natural Science Research Council and by the Director, Office of Energy Research, Office of High Energy and Nuclear Physics, Nuclear Physics Division of the U.S. Department of Energy under Contract No. DE-ACO3-76SF00098
One of the authors (J.H.) is grateful to V.F. Dmitriev for stimulating discussions.