Search

The cross sections of the 96 Zr (n , 2 n) 95 Zr , 90 Zr (n , 2 n) 89 Zr , and 90 Zr (n, 3n) 88 Zr reactions with the average neutron energies of 13.8–31.33 MeV were measured by using the activation and an off-line γ -ray spectrometric technique. The cross sections for the 96 Zr (n , 2 n) 95 Zr reaction at the average neutron energies of 18.91 MeV and 25.81 MeV, for the 90 Zr (n , 2 n) 89 Zr reaction at 28.74 MeV as well as for the 90 Zr (n , 3 n) 88 Zr reaction in the average energies of 27.37 MeV and 31.33 MeV are the first time measurements. The fast neutrons were generated by using the 9 Be(p, n) reaction with the proton energies of 25-, 35- and 45-MeV from the MC-50 Cyclotron at the Korea Institute of Radiological and Medical Sciences (KIRAMS). The neutron spectra were simulated by using the computer code MCNPX 2.6., whereas the experimental neutron fluxes were monitored based on the 27 Al (n , α) 24 Na reaction. The cross sections for the 96 Zr (n , 2 n) 95 Zr , 90 Zr (n , 2 n) 89 Zr , and 90 Zr (n, 3n) 88 Zr reactions induced by mono-energetic neutrons were also calculated by using the TALYS 1.9 code. The present results are compared with the literature data and the theoretical values, and are found to be in good agreement. [ABSTRACT FROM AUTHOR]

The neutron induced cross sections of the Y(n,2n)Y, Y(n,3n)Y and Y(n,4n)Y reactions were measured in the neutron energy range of 15.2 to 37.2 MeV by using an activation and off-line $\gamma$ -ray spectrometric technique. The quasi-monoenergetic neutrons used for the above reactions are based on a Be(p,n) reaction. Simulations of the neutron spectra from the Be target were done using the MCNPX 2.6.0 program. Theoretical calculations were performed for the Y(n,2n)Y, Y(n,3n)Y and Y(n,4n)Y reaction cross sections using nuclear model code Talys 1.8. The measured and calculated cross sections were compared with the literature data given in EXFOR and the TENDL-2015 data libraries. The present data of the Y(n, xn) reaction were also compared with the similar data of the Y( $\gamma$ , xn) reaction to examine the effect of the entrance channel parameters as well as the role of projectiles and ejectiles. [ABSTRACT FROM AUTHOR]