New 209Bi photodisintegration data and physical criteria of data reliability

Belyshev, S.; Davydov, A.; Filipescu, D.; Gheorghe, I.; Ishkhanov, B.; Kuznetsov, A.; Orlin, V.; Stopani, K.; Utsunomiya, H.; Varlamov, V.

Авторы: Belyshev Sergei, Davydov Aleksandr, Filipescu Dan, Gheorghe Ioana, Ishkhanov Boris, Kuznetsov Aleksandr, Orlin Vadim, Stopani Konstantin, Utsunomiya Hiroaki, Varlamov Vladimir
Журнал: EPJ Web of Conferences
Том: 239
Год издания: 2020
Первая страница: 01031-1
Последняя страница: 01031-4
DOI: 10.1051/epjconf/202023901031
Аннотация: The well-known problem of noticeable disagreements between photoneutron cross sections from various experiments was discussed in detail for 209Bi. Data for partial photoneutron reactions cross sections obtained at Livermore (USA) using quasimonoenergetic annihilation photon beams and the method of neutron multiplicity sorting were analyzed using the objective physical criteria and the experimental-theoretical method of evaluation. Because of significant systematic uncertainties involved in the method for determining the neutron multiplicity, experimental data do not satisfy the criteria of reliability and differ noticeably from the evaluated data. The new experimental data for 209Bi(γ, in) reactions with i = 1–4 were obtained using quasi-monochromatic laser Compton-scattering (LCS) γ-ray beams at the NewSUBARU synchrotron radiation facility and the novel technique of direct neutron-multiplicity sorting with a flat-efficiency detector. It was found that new SIG(g, 1n),SIG(g, 2n), and SIG(g, 3n) contradict noticeably to the experimental data obtained at Livermore. It was shown that at the same time the new 209Bi photoneutron cross-sections are in good agreement with data evaluated using experimental-theoretical method and assuring the reliability of those.
Добавил в систему: Варламов Владимир Васильевич

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