Eur. Phys. J. A (2021) 57: 208
https://doi.org/10.1140/epja/s10050-021-00484-x

Regular Article - Experimental Physics

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

National Science Center Kharkov Institute of Physics and Technology, 1, Akademicheskaya St., 61108, Kharkov, Ukraine

^c timchenko@kipt.kharkov.ua

Received: 15 March 2021
Accepted: 9 May 2021
Published online: 28 June 2021

Abstract

The flux-averaged cross-sections $⟨\sigma (E_{\gamma \max })⟩$ for the ${}^{181}\mathrm{Ta}(\gamma ,\mathit{x}n;\mathit{x}=1$–${8)}^{181-\mathit{x}}\mathrm{Ta}$ 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 $⟨\sigma (E_{\gamma \max })⟩$ 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 $d(E_{\gamma \max })$ 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.