Abstract
Differential cross sections of and charge-exchange reactions leading to the excitation of the isobaric analog state (IAS) of the target nucleus are calculated with the distorted wave Born approximation. The -matrix double-folding method is employed to determine the nucleus-nucleus optical potential within the framework of the Lane model. matrices are obtained from a Brueckner-Hartree-Fock calculation using the Argonne Av18 nucleon-nucleon potential. Target densities have been taken from Skyrme-Hartree-Fock calculations which predict values for the neutron skin thickness of heavy nuclei compatible with current existing data. Calculations are compared with experimental data of the reactions on at MeV and at MeV and MeV, and on and at MeV. Experimental results are well described without the necessity of any rescaling of the strength of the optical potential. A clear improvement in the description of the differential cross sections for the reactions on and targets is found when the neutron excess density is used to determine the transition densities. Our results show that the density and isospin dependences of the matrices play a non-negligible role in the description of the experimental data.
- Received 31 October 2020
- Revised 18 December 2020
- Accepted 7 January 2021
DOI:https://doi.org/10.1103/PhysRevC.103.024601
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