Excitation of baryonic resonances in stable medium-mass nuclei of Sn

TL;DR

This study investigates baryonic resonance excitation in stable medium-mass tin nuclei through isobaric charge-exchange reactions, providing precise cross-section measurements and insights into in-medium baryonic resonance behavior.

Contribution

It presents high-precision measurements of charge-exchange cross sections and separates quasi-elastic and inelastic contributions, advancing understanding of baryonic resonances in nuclear media.

Findings

Accurate cross-section data with 3% precision.

Separation of quasi-elastic and inelastic reaction components.

Observation of in-medium baryonic resonance excitation.

Abstract

Isobaric charge-exchange reactions induced by beams of 112Sn have been investigated at the GSI facilities using the fragment separator FRS. The high-resolving power of this spectrometer makes it possible to obtain the isobaric charge-exchange cross sections with an accuracy of 3% and to separate quasi-elastic and inelastic contributions in the missing-energy spectra, in which the inelastic component is associated to the in-medium excitation of baryonic resonances such as the $\Delta$ resonance. We report on the results obtained for the (p,n) and (n,p) channels excited by using different targets that cover a large range in neutron excess.