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The photoneutron reaction $^{181}\rm{Ta}(\gamma,3n)^{178m,g}\rm{Ta}$ wasinvestigated with the beam from the NSC KIPT electron linear acceleratorLUE-40. The measurements were performed using the residual $\gamma$-activitymethod. The bremsstrahlung flux-averaged cross-sections$\langle{\sigma(E_{\rm{\gamma max}})}\rangle$, $\langle{\sigma(E_{\rm{\gammamax}})}\rangle_{\rm{m}}$, $\langle{\sigma(E_{\rm{\gammamax}})}\rangle_{\rm{g}}$ and the isomeric ratio of the reaction products$d(E_{\rm{\gamma max}})$ have been measured. Theoretical values of averagedcross-sections and isomeric ratio were calculated using partial cross-sectionsfrom the TALYS1.95 code for different level density models $LD$ 1-6. Theobtained experimental $d(E_{\rm{\gamma max}})$ agree with the literature data,but differ from the theoretical values in absolute magnitude and the behaviorof the energy dependence. A comparison of the found averaged cross-sectionswith the calculated ones showed the best agreement for the case of the $LD$ 5model.

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