Tb-159 PARTIAL PHOTONEUTRON REACTION CROSS SECTIONS EVALUATION FREE FROM SHORTCOMINGS OF PHOTONEUTRON MULTIPLICITY SORTING EXPERIMENTAL METHODS

Authors & Affiliations

Varlamov V.V., Ishkhanov B.S., Peskov N.N., Stepanov M.E.
D. V. Skobeltsyn Institute of Nuclear Physics (SINP) of the Moscow State University, Russia

The systematic disagreements between the results of various experiments using bremsstrahlung and quasimonoenergetic annihilation photons devoted to obtaining of total σ(γ,xn) and partial σ(γ,n), σ(γ,2n) and σ(γ,3n) reaction cross sections for 159Tb were analyzed, the possible reasons of those and methods for their taking into account were examined. Using the special transitional function of multiplicity F2 = σ(γ,2n)/σ(γ,xn) it was shown that in many photon energy ranges concrete experiment results are not reliable and authentic because photoneutron multiplicity sorting was carried out incorrectly. New evaluated data for partial σ(γ,n), σ(γ,2n) and σ(γ,3n) and total σ(γ,xn) reaction cross sections on 159Tb free from shortcomings of experimental neutron multiplicity sorting methods were obtained in the frame of new experimental-theoretical treatment in which the total photoneutron yield reaction cross section σ(γ,xn) was used as initial experimental data and for obtaining of partial reaction cross sections contributions to it equations of modern preequilibrium photonuclear reaction model were applied.

Keywords
giant dipole resonance, GDR, partial sectional photoneutron reactions, quasimonoenergetic photons, neutrons split the multiplicity, 159Tb

Article Text (in Russian, PDF)

References

UDC 539.17

Problems of Atomic Science and Technology. Series: Nuclear Constants, issue 1-2, 2011-2012