Absolute (γ,p0) and (γ,p1) cross sections and angular distributions for the light, deformed nucleusF19

Abstract

Absolute ($\ensuremath{\gamma},{\mathrm{p}}_{0}$) and ($\ensuremath{\gamma},{\mathrm{p}}_{1}$) differential cross sections for $^{19}\mathrm{F}$ have been measured at seven angles in the energy interval between 13.4 and 25.8 MeV. A sum of Legendre polynomials was fitted to the angular distributions to deduce the angular distribution coefficients. The ($\ensuremath{\gamma},{\mathrm{p}}_{0}$) and ($\ensuremath{\gamma},{\mathrm{p}}_{1}$) cross sections have a similar magnitude and represent a minor fraction of the total photoproton channel. The global difference between the two cross sections is attributed to configurational splitting effects. From the ($\ensuremath{\gamma},{\mathrm{p}}_{0}$) angular distribution coefficients, an $E2$ cross section was estimated, contributing about 37% to the total $E2$ energy-weighted sum rule.