arXiv 1809.026642018-09-10nucl-exhep-exphysics.ins-det

钆-157热中子俘获的Gamma Ray谱

Gamma Ray Spectrum from Thermal Neutron Capture on Gadolinium-157

Kaito Hagiwara, Takatomi Yano, Tomoyuki Tanaka, Pretam Kumar Das, Sebastian Lorenz, Iwa Ou, Takashi Sudo, Mandeep Singh Reen, Yoshiyuki Yamada, Takaaki Mori, Ts… 展开作者

Kaito Hagiwara, Takatomi Yano, Tomoyuki Tanaka, Pretam Kumar Das, Sebastian Lorenz, Iwa Ou, Takashi Sudo, Mandeep Singh Reen, Yoshiyuki Yamada, Takaaki Mori, Tsubasa Kayano, Rohit Dir, Yusuke Koshio, Makoto Sakuda, Atsushi Kimura, Shoji Nakamura, Nobuyuki Iwamoto, Hideo Harada, Michael Wurm, William Focillon, Michel Gonin, Ajmi Ali, Gianmaria Collazuol

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摘要：

我们测量了在能量范围从0.11 MeV到大约8 MeV的富集$^{157}$ Gd靶（Gd $_{2}$ O $_{3}$）上来自热中子俘获的$γ$射线能谱，${}^{157}$ Gd $(n,γ){}^{158}$ Gd.该靶被放置在J-PARC的ANNRI探测器的锗光谱仪内，并暴露于日本Spanish中子源（JSNS）的中子束。放射源（$^{60}$ Co、$^{137}$ Cs和$^{152}$ Eu）和反应$^{35}$ Cl（$n$、$γ$）用于确定光谱仪对能量为0.3至8.5 MeV的$γ$射线的探测效率。使用Geant 4为基础的Monte Carlo模拟的检测器和我们的数据的基础上，我们已经开发了一个模型来描述的$γ$ -射线光谱的热${}^{157}$ Gd（$n$，$γ$）反应。虽然我们将来自我们的数据的15个高于5 MeV的突出峰和低于1.6 MeV的相关峰的强度信息直接包括到模型中，但是我们依赖于核能级密度的理论输入和${}^{158}$ Gd的光子强度函数来描述来自${}^{157}$ Gd（$n$，$γ$）反应的连续$γ$射线谱。我们的模型结合了这两个组件。从反应和模型中观察到的$γ$ -射线光谱之间的比较结果的详细报告。

英文摘要：

We have measured the $γ$-ray energy spectrum from the thermal neutron capture, ${}^{157}$Gd$(n,γ){}^{158}$Gd, on an enriched $^{157}$Gd target (Gd$_{2}$O$_{3}$) in the energy range from 0.11 MeV up to about 8 MeV. The target was placed inside the germanium spectrometer of the ANNRI detector at J-PARC and exposed to a neutron beam from the Japan Spallation Neutron Source (JSNS). Radioactive sources ($^{60}$Co, $^{137}$Cs, and $^{152}$Eu) and the reaction $^{35}$Cl($n$,$γ$) were used to determine the spectrometer's detection efficiency for $γ$ rays at energies from 0.3 to 8.5 MeV. Using a Geant4-based Monte Carlo simulation of the detector and based on our data, we have developed a model to describe the $γ$-ray spectrum from the thermal ${}^{157}$Gd($n$,$γ$) reaction. While we include the strength information of 15 prominent peaks above 5 MeV and associated peaks below 1.6 MeV from our data directly into the model, we rely on the theoretical inputs of nuclear level density and the photon strength function of ${}^{158}$Gd to describe the continuum $γ$-ray spectrum from the ${}^{157}$Gd($n$,$γ$) reaction. Our model combines these two components. The results of the comparison between the observed $γ$-ray spectra from the reaction and the model are reported in detail.

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