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

Abstract

The bremsstrahlung flux-averaged cross-sections $⟨\sigma (E_{\gamma \max })⟩$ for the ${}^{181}\mathrm{Ta}(\gamma ,\text{x}\mathrm{n};\text{x}=1÷8{)}^{181-\text{x}}\mathrm{Ta}$ 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 $⟨\sigma (E_{\gamma \max })⟩$ values were computed using the cross-sections $\sigma (E)$ from TALYS1.9 code. A comparison between the measured cross-sections $⟨\sigma (E_{\gamma \max })⟩$ and the theoretical values has demostrated their good agreement for the reactions with escape of up to 6 neutrons, and substantial differences for the $(\gamma ,7\mathrm{n})$ and $(\gamma ,8\mathrm{n})$ reactions. Isomeric ratios of the average cross-sections $d(E_{\gamma \max })$ have been found for the ${}^{181}\mathrm{Ta}(\gamma ,3n{)}^{178g,\mathrm{m}}\mathrm{Ta}$ reaction products. The results have been compared with the literature data and the computations based on TALYS1.9 code.

9 pages, 5 figures, 1 Table