New data on partial photoneutron reaction cross sections obtained using new approach for analysis and evaluation

Ishkhanov, B.S.; Makarov, M.A.; Orlin, V.N.; Peskov, N.N.; Stepanov, M.E.; Varlamov, V.V.

Авторы: Ishkhanov B.S., Makarov M.A., Orlin V.N., Peskov N.N., Stepanov M.E., Varlamov V.V.
Сборник: Материалы международной конференции «Современные проблемы физики и новых технологий», Казахский национальный университет (Алма-Ата, 21 – 22 февраля 2014 г.)
Тезисы
Год издания: 2014
Место издания: КазНу им. аль-Фараби Алма-Ата
Первая страница: 46
Последняя страница: 46
Аннотация: The large part of cross sections of partial photoneutron reactions, primarily (g,n), (g,2n) and (g,3n), were obtained using quasimonoenergetic annihilation photons and the method of neutron multiplicity sorting at Livermore (USA) and Saclay (France). Unfortunately there are significant systematic disagreements between data – in many cases (g,n) reaction cross sections have larger amplitudes at Saclay, but (g,2n) reaction cross sections vice versa at Livermore. New experimentally–theoretical method for overcoming data disagreements and obtaining the reliable data was proposed on the base of using of experimental data for only neutron yield reaction cross sections SIG(g,xn) in combination with results of partial reaction cross sections calculated in the frame of combined preequilibrium photonuclear reaction model with using the Fermi-gas densities equations and taking into account the effects of nuclear deformation and GDR isospin splitting. Partial reaction cross sections evaluated by the way SIG-eval(g,in) = F-theori(g,in) • SIG-exp(g,xn) are nod depended on the experimental neutron multiplicity sorting method shortcomings and are satisfied objective data reliability criteria. New reliable data on partial and total photoneutron reaction cross sections were obtained for majority of nuclei mentioned above. Evaluated data disagree with data obtained using the neutron multiplicity sorting method but agree with accessible data obtained using alternative activation method in which individual reaction is identified not by outgoing neutrons but by final nucleus produced. Various physical consequences of “evaluated–experimental” data distinctions are discussed.
Добавил в систему: Варламов Владимир Васильевич

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