Photoneutron Reactions $^{181}\rm{Ta}(\gamma,\textit{x}n; \textit{x} = 1 \div 8)^{181-\textit{x}}\rm{Ta}$ AT $E_{\rm{\gamma max}}$ = 80 $\div$ 95 MeV

Abstract

The bremsstrahlung flux-averaged cross-sections $\langle{\sigma(E_{\rm{\gamma max}})}\rangle$ for the $^{181}\rm{Ta}(\gamma,\textit{x}n; \textit{x} = 1 \div 8)^{181-\textit{x}}\rm{Ta}$ photoneutron reactions have been measured at end-point bremsstrahlung energies ranging from 80 MeV to 95 MeV. The measurements were performed with the beam from the NSC KIPT electron linear accelerator LUE-40 using the residual $\gamma$-activity method. The theoretical $\langle{\sigma(E_{\rm{\gamma max}})}\rangle$ values were computed using the cross-sections $\sigma(E)$ from TALYS1.9 code. A comparison between the measured cross-sections $\langle{\sigma(E_{\rm{\gamma max}})}\rangle$ and the theoretical values has demostrated their good agreement for the reactions with escape of up to 6 neutrons, and substantial differences for the $(\gamma,7\rm{n})$ and $(\gamma,8\rm{n})$ reactions. Isomeric ratios of the average cross-sections $d(E_{\rm{\gamma max}})$ have been found for the $^{181}\rm{Ta}(\gamma,3n)^{178g,m}\rm{Ta}$ reaction products. The results have been compared with the literature data and the computations based on TALYS1.9 code.