Cross section for the neutron radiative capture on Lu173 nuclei
Cross section for the neutron radiative capture on
Lu173
nuclei
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Lu173 原子核中子辐射捕获的横截面
DOI：
10.1103/physrevc.99.064603
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发表时间：
2019
影响因子：
3.1
通讯作者：
D. Vieira
中科院分区：
文献类型：
--
作者：
A. Ebran;O. Roig;V. Méot;M. Jandel;C. Theroine;E. Bond;T. Bredeweg;A. Couture;F. Nortier;J. O'Donnell;W. Taylor;J. Ullmann;D. Vieira
我们首次在洛斯阿拉莫斯舞动探测器(高级中子俘获实验探测器)上测量了具有高伽马活度的靶上的中子辐射截面。研究了不稳定的Lu173同位素的(n，γ)反应性质。需要两次实验运动才能确定Lu173(n，γ)的横截面。他们是在洛斯阿拉莫斯中子科学中心(LANSCE)散裂中子源设施进行的。为此，先后使用质子辐照和化学分离从一个HF样品中产生了两个靶。它们由Lu173、Lu174和Lu175同位素组成。这两次测量每隔两年进行一次，利用同位素衰变寿命的差异来识别Lu173(n，γ)和Lu174(n，γ)反应的共振。观察到了一百多个新的共振，其中大部分来自Lu173(n，γ)反应。只有几个化合物被指定为Lu174(n，γ)反应。对于Lu173(n，γ)反应，测量了从热中子到200eV的能量范围内的辐射中子俘获截面。用Sammy程序提取了可分辨共振区的共振参数，用Talys计算确定了未分辨共振区的俘获截面。在kev区，我们通过用qRPA模型中的另一个标准talys光子强度函数代替标准talys光子强度函数，进行了标准talys计算和其他微观研究。
We report the measurement of a neutron radiative cross section on a target with a high gamma activity, at the Los Alamos DANCE detector (Detector for Advanced Neutron Capture Experiments) for the first time. The (n,γ) reaction properties of the unstable Lu173 isotope were studied. Two experimental campaigns were needed to determine the Lu173(n,γ) cross section. They were performed at the Los Alamos Neutron Science Center (LANSCE) spallation neutron source facility. To this end, two targets were produced from an Hf sample using successively proton irradiation and chemical separations. They were composed of Lu173,Lu174, and Lu175 isotopes. The two measurements were conducted at two-year intervals, taking advantage of the difference of the isotopic decay lifetimes in order to identify resonances from the Lu173(n,γ) and Lu174(n,γ) reactions. Just over one hundred new resonances were observed, the majority of which come from the Lu173(n,γ) reaction. Only a few of them were assigned to the Lu174(n,γ) reaction. As regards the Lu173(n,γ) reaction, the radiative neutron capture cross section was determined over the energy range from thermal neutron up to 200 eV. The parameters of resonances in the resolved resonance region were extracted with the sammy code while calculations with talys determined the capture cross section in the unresolved resonances region. At the keV region, we performed standard talys calculations as well as other microscopic investigations by substituting the standard talys photon strength function by another one from QRPA models.