Varlamov V.V., Peskov N.N., Rudenko D.V., Stepanov M.E.
M.V. Lomonosov Moscow State University, D.V. Skobel’tsyn Scientific Research Institute for Nuclear Physics, Centre for Photonuclear Experiment Data, Russia
A detailed,systematic analysis of the (γ,xn), (γ,n) and (γ,2n) reaction cross-section data
obtained using quasimonoenergetic annihilation photon beams at Livermore
(USA) and Saclay (France) was carried out for 19 nuclei (7 initially): 51V, 75As, 89Y, 90Zr, 115In, 116,117,118, 120,124Sn, 127I, 133Cs, 159Tb, 165Ho, 181Ta, 197Au, 208Pb, 232Th, 238U. It was observed that the (γ,xn) reaction cross-section data
obtained at both laboratories without using a neutron multiplicity
determination procedure disagreed by 10-15%. Additionally, it was found
that the disagreement of the (γ,n) and (γ,2n) partial reaction cross-sections
obtained at both laboratories using a neutron multiplicity determination
procedure was significantly greater (up to 30-40%), and as a rule in
different directions. These disagreements were interpreted as being the
result of differences in the neutron multiplicity determination procedures
used in both laboratories: the procedure at Saclay was incorrect, resulting in
the incorrect attribution of part of the (γ,2n) reaction cross-section to the
(γ,n) reaction. A special method was used to make the data consistent. This
involved recalculating the part of the (γ,n) reaction cross-section determined
to be "false" and moving it back to the (γ,2n) reaction cross-section. For all
19 nuclei listed above, the jointly corrected (γ,xn), (γ,n) and (γ,2n) reaction
cross-sections were evaluated and prepared for inclusion in the EXFOR
nuclear reaction database.
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