Abstract
The40Ca(18O,18F)40K single charge exchange (SCE) reaction is explored at an incident energy of 275 MeV and analyzed consistently by collecting the elastic scattering and inelastic scattering data under the same experimental conditions. Full quantum-mechanical SCE calculations of the direct mechanism are performed by including microscopic nuclear structure inputs and adopting either a bare optical potential or a coupled channel equivalent polarization potential (CCEP) constrained by the elastic and inelastic data. The direct SCE mechanism describes the magnitude and shape of the angular distributions rather well, thus suggesting the suppression of sequential multi-nucleon transfer processes.
Highlights
Single charge exchange (SCE) reactions are considered to be the best probe to explore the isospin and spin–isospin nuclear response to the strong interaction
The 40Ca(18O,18F)40K charge exchange reaction, together with the elastic scattering and inelastic scattering of 18O on 40Ca, has been studied at an incident energy of 275 MeV and at forward angles using the MAGNEX spectrometer. The availability of this complete set of data, where the absolute cross section at different angles has been measured with high precision, has allowed a constrained and reliable description of the direct reaction mechanism for the charge exchange process
Charge exchange cross section calculations have been performed in DWBA using a coupled channel equivalent polarization potential (CCEP) tested against the elastic and inelastic scattering data and form factors extracted from double folding of a nucleon– nucleon isovector interaction with QRPA transition densities
Summary
Single charge exchange (SCE) reactions are considered to be the best probe to explore the isospin and spin–isospin nuclear response to the strong interaction. The procedure to reduce the collected data and extract the energy spectra and the cross section angular distributions for the measured transitions is described in detail by Cappuzzello et al (2010), Cappuzzello et al (2011), Cappuzzello et al (2014), Calabrese et al (2020), Cavallaro et al (2011), and Carbone (2015).
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