Isomeric ratio of the ¹⁸¹Ta(?, 3n)^178m,gTa reaction products at energy E _?max up to 95 MeV

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