Thermal neutron fluence measurement using a cadmium differential method at the laser-driven neutron source
Thermal neutron fluence measurement using a cadmium differential method at the laser-driven neutron source
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在激光驱动中子源处使用镉微分法测量热中子注量
DOI：
10.1088/1361-6471/ac6272
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Kodama Ryosuke
中科院分区：
文献类型：
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作者：
Mori Takato;Yogo Akifumi;Hayakawa Takehito;Mirfayzi Seyed R;Lan Zechen;Wei Tianyun;Abe Yuki;Arikawa Yasunobu;Nakai Mitsuo;Mima Kunioki;Nishimura Hiroaki;Fujioka Shinsuke;Kodama Ryosuke
我们利用激光等离子体相互作用提供的连续能量分别高达30和10 MeV/u的质子和氘核与p+ Be和d+ Be反应产生了高能中子。热中子随后通过与Be靶结合的小型慢化剂的减速产生。在这里，我们报告了热中子通量的测量使用活化法有/没有Cd过滤器。通过单次激光（n, γ）反应制备了198 Au、56 Mn、60 Co和181 Hf的不稳定同位素。通过测量这些不稳定同位素发出的γ射线来评估核反应分数。这四种核素的热中子影响在它们的实验不确定度内是一致的。在距激光轴90°方向约9mm处的通量为（2.2±0.4）× 105neutron cm - 2。目前的结果表明，从直径44毫米、长度46毫米的致密中子源产生热中子的方法有望成为各种核实验和应用的有用工具。
We produced high-energy neutrons by p+ Be and d+ Be reactions with protons and deuterons with continuous energies of up to 30 and 10 MeV/u, respectively, provided from laser-plasma interactions. Thermal neutrons were subsequently generated through deceleration by a small moderator with conjunction on the Be target. Here, we report the measurements on the thermal neutron fluence using the activation method with/without Cd filters. The unstable isotopes of 198 Au, 56 Mn, 60 Co, and 181 Hf were produced through (n, γ) reactions by a single laser shot. The nuclear reaction fractions were evaluated by measuring the γ-rays emitted from these unstable isotopes. The thermal neutron fluences from the four nuclides are consistent within their experimental uncertainties. The fluence is evaluated to be (2.2±0.4)× 10 5 neutrons cm− 2 at the distance of approximately 9 mm at 90 against the laser axis. The present result shows that the method to generate thermal neutrons from a compact neutron source with a diameter of 44 mm and length of 46 mm is expected to be a useful tool for various nuclear experiments and applications.