Abstract
It is shown that, using published results from various experiments performed with bremsstrahlung \(\gamma\) -radiation beams, it is in many cases possible to obtain new data on photodisintegration of nuclei, primarily cross sections of photoneutron reactions, which were previously unknown. Such possibilities have been realized for the nuclei \({}^{52}\) Cr and \({}^{68}\) Zn. Previously unpublished cross sections \(\sigma(\gamma,2n)\) and \(\sigma(\gamma,xn)=\sigma(\gamma,1n)+2\sigma(\gamma,2n)\) for the nucleus \({}^{52}\) Cr, and \(\sigma(\gamma,1n)\) , \(\sigma(\gamma,2n)\) and \(\sigma(\gamma,sn)=\sigma(\gamma,1n)+\sigma(\gamma,2n)\) for the nucleus \({}^{68}\) Zn have been obtained for the first time based on published experimental data. It has been established that the experimental cross sections of partial reactions on the \({}^{52}\) Cr nucleus do not satisfy objective physical reliability criteria. New cross sections for the reactions \({}^{52}\) Cr( \(\gamma,1n\) ) and \({}^{52}\) Cr( \(\gamma,2n\) ) \({}^{50}\) Cr, which meet physical criteria, have been evaluated using an experimental–theoretical method and used to determine a new cross section for the total photoneutron reaction \({}^{52}\) Cr( \(\gamma,sn\) ). In the case of the \({}^{68}\) Zn nucleus, using the only published experimental cross section for neutron yield \({}^{68}\) Zn( \(\gamma,xn\) ), new previously unknown cross sections of partial reactions \({}^{68}\) Zn( \(\gamma,1n\) ) \({}^{67}\) Zn and \({}^{68}\) Zn( \(\gamma,2n\) ) \({}^{66}\) Zn, as well as the cross section of the total photoneutron reaction \({}^{68}\) Zn( \(\gamma,sn\) ), have been obtained for the first time using the experimental–theoretical method.
