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There is well-known problem of significant systematic disagreements between data for reactions ( γ , 1 n ), ( γ , 2 n ), obtained at Livermore (USA) and Saclay (France) using the method of photoneutron multiplicity sorting. The averaged ratios  R   S/L    int   of integrated cross sections obtained at Saclay and Livermore for 19 nuclei from  51 V to  239 U are equal to 0.84 for ( γ , 2 n ) and 1.07 for ( γ , 1 n ) reactions. For  75 As  R   S/L    int   ratios for both partial reactions are very close (1.22 and 1.21) but for  181 Ta - are quite different (0.89 and 1.25). Using the objective physical data reliability criteria it was found that there are serious doubts in reliability of Saclay and Livermore data. The newly evaluated reliable cross sections disagree with experimental data. In addition to unreliable sorting of many neutrons between both partial reactions many neutrons were lost - on the case of  181 Ta in 1n channel, in the case of  75 As in both 1n and 2n channels.

Photoneutron reaction cross sections for 75As and 181Ta: Sytematic uncertainties and data reliability

Photoneutron reaction cross sections for ⁷⁵As and ¹⁸¹Ta: Sytematic uncertainties and data reliability