论文标题
在PSI超速中子源的薄固体氘膜中的超速中子产生的表征
Characterization of ultracold neutron production in thin solid deuterium films at the PSI Ultracold Neutron source
论文作者
论文摘要
我们通过在Paul Scherrer Institute（PSI）的UCN源的固体氘（SD $ _2 $）主持人中确定了超热转化的超速中子（UCN）生产率。特别是，我们认为低于$ 20 \的低含量，$ mol的d $ _2 $，存放在冷却的主持人容器表面上，厚度为几毫米。 We measured the isotopic ($ c_\text{HD} < 0.2 \, \% $) and isomeric ($ c_\text{para} \le 2.7 \, \% $) purity of the deuterium to conclude that absorption and up-scattering at $5\,$K have a negligible effect on the UCN yield from the thin films.我们根据先前测得的热水热主持人的热中子通量与测量Beamports处的UCN计数速率进行了比较了UCN的产量。我们证实了我们的结果，因此证明了通过模拟对源中UCN产生和运输的绝对表征。
We determined the ultracold neutron (UCN) production rate by superthermal conversion in the solid deuterium (sD$_2$) moderator of the UCN source at the Paul Scherrer Institute (PSI). In particular, we considered low amounts of less than $20\,$mol of D$_2$, deposited on the cooled moderator vessel surfaces in thin films of a few mm thickness. We measured the isotopic ($ c_\text{HD} < 0.2 \, \% $) and isomeric ($ c_\text{para} \le 2.7 \, \% $) purity of the deuterium to conclude that absorption and up-scattering at $5\,$K have a negligible effect on the UCN yield from the thin films. We compared the calculated UCN yield based on the previously measured thermal neutron flux from the heavy water thermal moderator with measurements of the UCN count rates at the beamports. We confirmed our results and thus demonstrate an absolute characterization of the UCN production and transport in the source by simulations.
