Abstract
Abstract A new approach is proposed for the investigation of delta (Δ) excitations in nuclei induced by intermediate energy charge exchange reactions. The approach is based on the isobar-hole model which treats the dynamics of the Δ in the nucleus explicitly. The distortion effects of the projectile wave functions are included properly. The inclusive Δ-cross section is calculated. It is found that in a distorted wave calculation the peak position of the Δ-cross section is shifted towards lower excitation energies compared to a plane wave calculation. The shift amounts to 25 MeV in the 12 C(p,n)-reaction at 800 MeV incident energy and it amounts to 40 MeV in the 12 C( 3 He,t)-reactions at E = 2 GeV. The origin of this shift is explained in detail.
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