Simultaneous measurement of neutron-induced fission and capture cross sections for 241Am at neutron energies below fission threshold.
Simultaneous measurement of neutron-induced fission and capture cross sections for 241Am at neutron energies below fission threshold.
复制标题
在中子能量低于裂变阈值时同时测量 241Am 的中子诱发裂变和俘获截面。
DOI：
10.1016/j.nima.2016.12.021
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
T. Ohtsuki.
中科院分区：
文献类型：
--
作者：
K. Hirose;K. Nishio;H. Makii;I Nishinaka;S. Ota;T. Nagayama;N. Tamura;S. Goto;A. Andreyev;M. Vermeulen;S. Gilespie;C. Barton;A. Kimura;H. Harada;S. Meigo;S Chiba;T. Ohtsuki.
在日本质子加速器研究综合体（J-PARC）的散中子装置上，对241 Am的中子诱发反应进行了裂变和俘获反应的同时测量。使用TOF方法获取了En =0.1-20 eV的中子能量范围的数据。裂变事件是通过使用液体有机稀释剂探测伴随裂变的瞬发中子来观察的。俘获反应是通过使用相同的探测器探测复合核去激发时发射的γ射线来测量的，其中瞬发裂变中子和俘获γ射线通过脉冲形状分析来分离。通过将第一共振处的相对产率归一化到评估或其他实验数据来获得横截面。在每个共振的裂变捕获截面的比率进行比较与那些从评估核数据库和其他实验数据。在几种共振下，发现当前值与图书馆/文献值之间存在一些差异。
Fission and capture reactions were simultaneously measured in the neutron-induced reactions of241Am at the spallation neutron facility of the Japan Proton Accelerator Research Complex (J-PARC). Data for the neutron energy range ofEn=0.1–20 eV were taken with the TOF method. The fission events were observed by detecting prompt neutrons accompanied by fission using liquid organic scintillators. The capture reaction was measured by detectingγrays emitted in the deexcitation of the compound nuclei using the same detectors, where the prompt fission neutrons and captureγrays were separated by a pulse shape analysis. The cross sections were obtained by normalizing the relative yields at the first resonance to evaluations or other experimental data. The ratio of the fission to capture cross sections at each resonance is compared with those from an evaluated nuclear data library and other experimental data. Some differences were found between the present values and the library/literature values at several resonances.