Abstract
A proton cyclotron MC-50 in Korea Institute of Radiological & Medical Science (KIRAMS) is used to carry out neutron activation experiments with Y2 O3 targets irradiated with neutron beams of a continuous spectrum produced by proton beams on a thick beryllium target. Neutrons are generated by 9 Be (p, n) reaction with an incident proton intensity of 20 μA. The neutron spectra generated by proton beams of 30, 35, and 40 MeV are calculated by GEANT4 simulations. Nb powders are used for neutron flux monitoring by measuring the activities of 92m Nb through the reaction 93 Nb (n, 2n). By using a subtraction method, the average cross section of 89 Y(n,2n) and 89 Y(n,3n) reactions at the neutron energies of 29.8 ± 1.8 MeV and 34.8 ± 1.8 MeV are extracted and are found to be close to the existing cross sections from the EXFOR data and the evaluated nuclear data libraries such as TENDL-2015 or EAF-2010.
Highlights
In the development of fast neutron systems, such as an Accelerator Driven System [1], nuclear data for neutron induced reactions at energies above 20 MeV are required, but they are not well known
It is known that the content of Yttrium can improve the corrosion resistance of Zirconium-base alloy, but the data on 89Y (n, 2n) cross sections were mostly reported up to the neutron energy of 30 MeV [2, 3], and only a few data exist above 30 MeV [4]
A proton cyclotron MC-50 in Korea Institute of Radiological and Medical Sciences (KIRAMS) is used to carry out neutron activation experiments with Y2O3 targets irradiated with neutron beams of a continuous spectrum produced by proton beams on a thick beryllium target
Summary
In the development of fast neutron systems, such as an Accelerator Driven System [1], nuclear data for neutron induced reactions at energies above 20 MeV are required, but they are not well known. It is known that the content of Yttrium can improve the corrosion resistance of Zirconium-base alloy, but the data on 89Y (n, 2n) cross sections were mostly reported up to the neutron energy of 30 MeV [2, 3], and only a few data exist above 30 MeV [4]. The data on 89Y (n, 3n) reactions at neutron energies above 30 MeV are only scarcely measured with large uncertainties [5]. We consider the neutron induced reactions of Yttrium for fast neutrons. We extracted (n, xn) cross sections by using a subtraction method
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