Isomeric Ratio of the ${}^{181}\mathrm{Ta}(\gamma ,3n{)}^{178m,\mathrm{g}}\mathrm{Ta}$ Reaction Products at Energy $E_{\gamma \max }$ up to 95 MeV

Abstract

The photoneutron reaction ${}^{181}\mathrm{Ta}(\gamma ,3n{)}^{178m,\mathrm{g}}\mathrm{Ta}$ was investigated with the beam from the NSC KIPT electron linear accelerator LUE-40. The measurements were performed using the residual $\gamma$-activity method. The bremsstrahlung flux-averaged cross-sections $⟨\sigma (E_{\gamma \max })⟩$, $⟨\sigma (E_{\gamma \max }){⟩}_{\mathrm{m}}$, $⟨\sigma (E_{\gamma \max }){⟩}_{\mathrm{g}}$ and the isomeric ratio of the reaction products $d(E_{\gamma \max })$ have been measured. Theoretical values of averaged cross-sections and isomeric ratio were calculated using partial cross-sections from the TALYS1.95 code for different level density models $LD$ 1-6. The obtained experimental $d(E_{\gamma \max })$ agree with the literature data, but differ from the theoretical values in absolute magnitude and the behavior of the energy dependence. A comparison of the found averaged cross-sections with the calculated ones showed the best agreement for the case of the $LD$ 5 model.

arXiv admin note: text overlap with arXiv:2103.09859

References in corpus (1)

• 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