Uncertainty quantification in (p,n) reactions*

Charge-exchange reactions populating isobaric analogue states (IAS) can be used to probe properties of the isovector part of the potential that informs the symmetry energy [1]. The quality of the nuclear-structure information extracted from charge-exchange measurements relies on the reaction model used, and in particular the optical potential employed. In this talk, I will show how the uncertainties associated with the optical potentials parameters propagate to charge-exchange observables for the excitation of the IAS, in particular the differential cross sections [2]. We consider the posterior distribution of the KDUQ global optical potentials [3] and compare two- and three-body formalisms for the description of the (p,n) charge-exchange reaction ⁴⁸Ca(p,n) ⁴⁸Sc at beam energies ranging from 25 MeV to 160 MeV.

[1]P. Danielewicz, P. Singh, and J. Lee, Nucl. Phys. A 958, 147 (2017).

[2]A. J. Smith, C. Hebborn, F. M. Nunes, and R. G. T. Zegers, Uncertainty quantification in (p, n) reactions (2024), arXiv:2403.18629.

[3]C. D. Pruitt, J. E. Escher, and R. Rahman, Phys. Rev. C 107, 014602 (2023)