Cross-sections of photoneutron reactions on ${}^{181}$Ta at $e_{\gamma \max }$ up to 95 MeV

Abstract

The total bremsstrahlung flux-averaged cross-sections $⟨\sigma (E_{\gamma \max })⟩$ for the photonuclear reactions ${}^{181}\mathrm{Ta}(\gamma ,\text{x}\mathrm{n};\text{x}\le 8{)}^{181-\text{x}}\mathrm{Ta}$ have been measured in the range of end-point energies $E_{\gamma \max }$ up to 95 MeV. The experiments were performed with the beam from the NSC KIPT electron linear accelerator LUE-40 with the use of the activation and off-line $\gamma$-ray spectrometric technique. The calculation of average cross-sections was carried out using the cross-section values computed with the TALYS1.95 code for different level density models $LD$ 1-6. A comparison between the experimental total cross-sections $⟨\sigma (E_{\gamma \max })⟩$ and the theoretical values has shown satisfactory agreement for the ${}^{181}\mathrm{Ta}(\gamma ,\text{x}\mathrm{n})$ reactions with the escape of 1-4, 6 and 7 neutrons. The closest agreement with the measured data is observed with the $LD$5 computation version, which represents the microscopic level density model taking into account Hilaire's combinatorial tables.

arXiv comment12 pages, 5 figures, 4 tables. arXiv admin note: text overlap with arXiv:2108.01635