Manifestation of important role of nuclear forces in emission of photons in scattering of pions off nuclei

TL;DR

This paper investigates photon emission during pion-nucleus scattering, revealing the significant role of nuclear forces and potential models in bremsstrahlung spectra, and proposes new experimental methods to study nuclear interactions.

Contribution

It is the first study to analyze bremsstrahlung photons in pion-nucleus scattering, highlighting the impact of nuclear potentials on photon emission spectra.

Findings

Nuclear part of Johnson-Satchler potential significantly affects bremsstrahlung spectrum.

Unusual influence of nuclear potentials observed at high photon energies.

Predictions made for bremsstrahlung spectra in pion scattering off calcium-44.

Abstract

Bremsstrahlung of photons emitted during the scattering of $\pi^{+}$-mesons off nuclei is studied for the first time. Role of interactions between $\pi^{+}$-mesons and nuclei in the formation of the bremsstrahlung emission is analyzed in details. We discover essential contribution of emitted photons from nuclear part of Johnson-Satchler potential to the full spectrum, in contrast to the optical Woods-Saxon potential. We observe unusual essential influence of the nuclear part of both potentials on the spectrum at high photon energies. This phenomenon opens a new experimental way to study and check non-Coulomb and nuclear interactions between pions and nuclei via measurements of the emitted photons. We provide predictions of the bremsstrahlung spectra for pion scattering off $^{44}{\rm Ca}$.