New Data on Photoneutron Reaction Cross Sections for $${}^{{68}}$$Zn

New data on cross sections of the ( $$\gamma,1n$$ ) and ( $$\gamma,2n$$ ) reactions on the $${}^{68}$$ Zn nucleus, for which the neutron yield cross sections of $$\sigma^{\textrm{exp}}(\gamma,xn)=\sigma(\gamma,1n)+2\sigma(\gamma,2n)$$ and the total photoneutron reaction $$\sigma^{\textrm{exp}}(\gamma,sn)=\sigma(\gamma,1n)+\sigma(\gamma,2n)$$ have been obtained in two experiments on the beams of bremsstrahlung, were determined using the possibilities of the experimental–theoretical method for the evaluation of cross sections of partial photoneutron reactions based on objective physical criteria. The contributions of partial reaction cross sections $$\sigma^{\textrm{eval}}(\gamma,in)=F_{i}^{\textrm{theor}}\times\sigma^{\textrm{exp}}(\gamma,xn)$$ for $$i=1$$ and $$2$$ to the neutron yield cross section were evaluated using the ratios $$F_{i}^{\textrm{theor}}=\sigma^{\textrm{theor}}(\gamma,in)/\sigma^{\textrm{theor}}(\gamma,xn)$$ calculated within the combined photonuclear reaction model (CPNRM).