Photoneutron cross-sections for the reactions $^{181}\mathrm{Ta}(\gamma ,\textit{x}n; \textit{x} = 1$–$8)^{181-\textit{x}}\mathrm{Ta}$ AT $\hbox { {E}}_\gamma {_\mathrm{max}}=$ 80–95 MeV

Abstract

The flux-averaged cross-sections $\langle {\sigma (E_{\gamma \mathrm{max}})}\rangle$ for the $^{181}\mathrm{Ta}(\gamma ,\textit{x}n; \textit{x} = 1$–$8)^{181-\textit{x}}\mathrm{Ta}$ reactions have been measured at the end-point bremsstrahlung energies of 80–95 MeV. The experiments were performed by using the beam from the NSC KIPT electron linear accelerator LUE-40 and measuring the residual $\gamma$-ray activities of the reaction products. The theoretical $\langle {\sigma (E_{\gamma \mathrm{max}})}\rangle$ values were computed using the mono-energetic cross-sections $\sigma (E)$ from TALYS1.9 code. A comparison between the measured average cross-sections and the theoretical values show good agreement for the $(\gamma ,1$–$6\mathrm{n})$ reactions but substantial differences for the $(\gamma ,7\mathrm{n})$ and $(\gamma ,8\mathrm{n})$ reactions. Isomeric average cross-section ratios $d(E_{\gamma \mathrm{max}})$ of a product $^{178g,m}\mathrm{Ta}$ produced from the $^{181}\mathrm{Ta}(\gamma ,3\mathrm{n})$ reaction have been obtained. The results have been compared with the literature data and the theoretical values based on TALYS1.9 code.