Skobeltsyn Institute of Nuclear Physics
Lomonosov Moscow State University

For Tantalum isotope $^{181}Ta partial photoneutron reaction cross sections were obtained using not only methods of neutron multiplicity sorting but alternative method of induced activity also. That gives to one possibility concern the program of investigation of reliability and authenticity of partial reaction data to compare such kind experiments results with data evaluated in the frame of new experimentally-theoretical method free from the problems of experimental determination of neutron multiplicities. With the aim of such comparison the joint analysis of data for total ($\gamma$,xn) and partial ($\gamma$,n), ($\gamma$,2n) и ($\gamma$,3n) photoneutron reactions on $^{181}Ta obtained at various experiments was carried out. Using special transitional functions F$_{i}$$^{theor.}$ = $\sigma$$^{theor.}$($\gamma),in)/$\sigma$$^{theor.}($\gamma$,xn) calculated in the frame of modern photonuclear reaction model new data for partial reaction cross sections $\sigma$$^{eval.}$($\gamma$,in) = F$_{i}$$^{theor.}$$\sigma}$$^{exp.}$($\gamma$,xn) free from the problems of experimental determination of neutron multiplicities were evaluated. The analysis of experimental data reliability and authenticity was carried out.