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arXiv 2301.13301nucl-ex
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对$^{185}$W($n,γ$)$^{186}$W截面的新实验约束

New experimental constraint on the $^{185}$W($n,γ$)$^{186}$W cross section

A. C. Larsen, G. M. Tveten, T. Renstrøm, H. Utsunomiya, E. Algin, T. Ari-izumi, K. O. Ay, F. L. Bello Garrote, L. Crespo Campo, F. Furmyr, S. Goriely, A. Görgen… 展开作者

A. C. Larsen, G. M. Tveten, T. Renstrøm, H. Utsunomiya, E. Algin, T. Ari-izumi, K. O. Ay, F. L. Bello Garrote, L. Crespo Campo, F. Furmyr, S. Goriely, A. Görgen, M. Guttormsen, V. W. Ingeberg, B. V. Kheswa, I. K. B. Kullmann, T. Laplace, E. Lima, M. Markova, J. E. Midtbø, S. Miyamoto, A. H. Mjøs, V. Modamio, M. Ozgur, F. Pogliano, S. Riemer-Sørensen, E. Sahin, S. Shen, S. Siem, A. Spyrou, M. Wiedeking

AI总结:

本研究通过钨的光核反应与α散射实验数据,结合核反应程序TALYS,间接约束了$^{185}$W($n,γ$)$^{186}$W的麦克斯韦平均截面,结果低于KADoNiS-1.0推荐值且不确定度更小,对s过程及锇核产额预测有重要意义。

摘要:

在本研究中,我们利用NewSUBARU同步辐射装置产生的准单色光子束,给出了$^{182,183,184}$W($γ,n$)截面的新数据。此外,我们从奥斯陆回旋加速器实验室测量的$^{186}$W($α,α^\rimeγ$)$^{186}$W反应数据中,提取了$^{186}$W的核能级密度和γ射线强度函数。将先前测得的$^{186}$W($γ,n$)截面数据与我们新获得的$^{182,183,184}$W($γ,n$)和($α,α^\rimeγ$)$^{186}$W数据集相结合,我们推导了$1 < E_γ< 6$ MeV和$7 < E_γ< 14$ MeV范围内的$^{186}$W γ射线强度函数。\n我们的数据被用于提取核反应程序\textsf{TALYS}所需的输入量——能级密度和γ射线强度函数,为$^{185}$W($n,γ$)$^{186}$W截面和反应速率提供了间接的实验约束。与KADoNiS-1.0数据库中推荐的麦克斯韦平均截面(MACS)相比,在相关能量范围$k_B T \u2208 [5,100]$ keV内,我们的结果平均更低,并且我们给出的MACS不确定度更小。Bao等人的理论值,以及基于Sonnabend等人的光中子数据得到的实验约束截面,均显著高于我们的结果。Mohr等人给出的更低数值与我们推导的MACS吻合得非常好。我们的新结果可能对s过程,尤其是对$^{186,187}$Os核的s过程产额预测具有重要意义。

英文摘要:

In this work, we present new data on the $^{182,183,184}$W($γ,n$) cross sections, utilizing a quasi-monochromatic photon beam produced at the NewSUBARU synchrotron radiation facility. Further, we have extracted the nuclear level density and $γ$-ray strength function of $^{186}$W from data on the $^{186}$W($α,α^\primeγ$)$^{186}$W reaction measured at the Oslo Cyclotron Laboratory. Combining previous measurements on the $^{186}$W($γ,n$) cross section with our new $^{182,183,184}$W($γ,n$) and ($α,α^\primeγ$)$^{186}$W data sets, we have deduced the $^{186}$W $γ$-ray strength function in the range of $1 < E_γ< 6$ MeV and $7 < E_γ< 14$ MeV. Our data are used to extract the level density and $γ$-ray strength functions needed as input to the nuclear-reaction code \textsf{TALYS}, providing an indirect, experimental constraint for the $^{185}$W($n,γ$)$^{186}$W cross section and reaction rate. Compared to the recommended Maxwellian-averaged cross section (MACS) in the KADoNiS-1.0 data base, our results are on average lower for the relevant energy range $k_B T \in [5,100]$ keV, and we provide a smaller uncertainty for the MACS. The theoretical values of Bao \textit{et al.} and the cross section experimentally constrained on photoneutron data of Sonnabend \textit{et al.} are significantly higher than our result. The lower value by Mohr \textit{et al.} is in very good agreement with our deduced MACS. Our new results could have implications for the $s$-process and in particular the predicted $s$-process production of $^{186,187}$Os nuclei.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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