Photonuclear reactions on the yttrium isotope $^{89}$Y

This paper presents the experimental research photodisintegration on the yttrium isotope 89Y. The absolute yields and average cross sections weighted by the bremsstrahlung spectrum for photoneutron reactions at the upper limit of the spectrum of the bremsstrahlung photons of 55 MeV are measured. Comparison of measured yields and average cross sections weighted by the bremsstrahlung spectrum was made with the yields of reactions calculated from theoretical sections of photoneutron reactions based on the TALYS model, as well as with the results of experiments performed on quasimonochromatic photons.