Cross section ratio and angular distributions of the reaction $p + d \rightarrow ^{3}He + \it{\eta}$ at 48.8 MeV and 59.8 MeV excess energy

We present new data for angular distributions and on the cross section ratio of the $p + d \rightarrow ^{3}He + \it{\eta}$ reaction at excess energies of $\it{Q}$ = 48.8 MeV and $\it{Q}$ = 59.8 MeV. The data have been obtained at the WASA-at-COSY experiment (Forschungszentrum Jülich) using a proton beam and a deuterium pellet target. While the shape of obtained angular distributions show only a slow variation with the energy, the new results indicate a distinct and unexpected total cross section fluctuation between $\it{Q}$ = 20 MeV and $\it{Q}$ = 60 MeV, which might indicate the variation of the production mechanism within this energy interval.