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arXiv 2108.01635nucl-exhep-ex
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能量为$E_{\rm{γmax}}$至95 MeV的$^{181}\rm{Ta}(γ,3n)^{178m,g}\rm{Ta}$反应产物的异构体比

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

O. S. Deiev, I. S. Timchenko, S. N. Olejnik, V. A. Kushnir, V. V. Mytrochenko, S. A. Perezhogin

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arXiv admin note: text overlap with arXiv:2103.09859
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摘要：

利用日本国家科学院KIPT电子直线加速器LUE-40的束流，研究了光中子反应$^{181}\rm{Ta}(γ,3n)^{178m,g}\rm{Ta}$。使用残留$γ$ -活性方法进行测量。测量了韧致辐射通量平均截面$\langle{σ(E_{\rm{γmax}})}\rangle$、$\langle{σ(E_{\rm{γmax}})}\rangle_{\rm{m}}$、$\langle{σ(E_{\rm{γmax}})}\rangle_{\rm{g}}$和反应产物的异构比$d(E_{\rm{γmax}})$。平均截面和同分异构比的理论值使用来自TMENS 1.95代码的不同能级密度模型$LD$ 1-6的部分截面来计算。得到的实验$d(E_{\rm{γmax}})$与文献数据一致，但在绝对量和能量依赖性方面与理论值不同.计算的平均横截面的比较表明，$LD$ 5模型的情况下，最好的协议。

英文摘要：

The photoneutron reaction $^{181}\rm{Ta}(γ,3n)^{178m,g}\rm{Ta}$ was investigated with the beam from the NSC KIPT electron linear accelerator LUE-40. The measurements were performed using the residual $γ$-activity method. The bremsstrahlung flux-averaged cross-sections $\langle{σ(E_{\rm{γmax}})}\rangle$, $\langle{σ(E_{\rm{γmax}})}\rangle_{\rm{m}}$, $\langle{σ(E_{\rm{γmax}})}\rangle_{\rm{g}}$ and the isomeric ratio of the reaction products $d(E_{\rm{γmax}})$ 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 $d(E_{\rm{γmax}})$ 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.

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