  The experiments were performed at bremsstrahlung end-point energies of 10-23
MeV with the beam from the MT-25 microtron with the use of the
{\gamma}-activation technique. The experimental values of relative yields were
compared with theoretical results obtained on the basis of TALYS with the
standard parameters and the combined model of photonucleon reactions. Including
isospin splitting in the combined model of photonucleon reactions allows to
describe experimental data on reactions with proton escape in energies range
from 10 to 23 MeV. Therefore, taking into account isospin splitting is
necessary for a correct description of the decay of the GDR.
