Photodisintegration of the isotopes [sup.186,188,189,190,192]Os: similarities and distinctions

• Published in: Physics of atomic nuclei 2015-09, Vol.78 (6), p.746
• Main Authors: Varlamov, V.V, Makarov, M.A, Peskov, N.N, Stepanov, M.E
• Format: Article
• Language: English
• Subjects: CROSS SECTIONS; ENERGY SPECTRA; KINETIC ENERGY; MULTIPLICITY; NEUTRONS; NUCLEAR PHYSICS AND RADIATION PHYSICS; NUCLEAR REACTION YIELD; OSMIUM 186 TARGET; OSMIUM 188 TARGET; OSMIUM 190 TARGET; OSMIUM 192 TARGET; PHOTONEUTRONS; PHOTONUCLEAR REACTIONS
• ISSN: 1063-7788; 1562-692X
• DOI: 10.1134/S1063778815060150

In addition to the results obtained earlier for the isotopes [sup.188,189]Os, experimental data on the photodisintegration of the isotopes [sup.186,190,192]Os are analyzed on the basis of specially introduced objective criteria of reliability of data on the cross sections for partial photoneutron reactions. It is found that the (γ, 1n), (γ, 2n), and (γ, 3n) cross sections for each isotope satisfy differently or, on the contrary, do not satisfy the data-reliability criteria. In many cases, the multiplicity transition functions specified as the ratios [F.sub.i] = σ(γ, in)/σ(γ, xn) of the cross sections for the (γ, in) partial reactions to the neutron-yield reaction cross section σ(γ, xn) = σ(γ, 1n) + 2σ(γ, 2n) + 3σ(γ, 3n) + ... have values that are physically unreliable by definition. It is shown that ambiguities in the dependence of significant systematic uncertainties in experimentally determined neutron multiplicities on the measured kinetic energies is the reason for this. The dependence of these uncertainties on the energy spectra of neutrons is analyzed. For the isotopes [sup.186,190,192]Os, new evaluated data satisfying the data-reliability criteria are obtained for the cross sections for partial and total photoneutron reactions.