论文标题
部分可观测时空混沌系统的无模型预测
Measurements of the $^{27}{\rm Al}(α,n)$ Thick Target Yield Near Threshold
论文作者
论文摘要
我们通过直接测量$^{27} {\ rm al}（α，n）$厚的目标产量的直接测量结果提出结果，该目标产量是$e_α\ $ 3 $ -3 $ - $ 5〜MEV，并在$^{3} $ hebf $ _ {3} $ _ {3} $ og _ {3} $巨型桶（Hebgbb）的eDector accelator eedwordator eDwordators eedwordators进行。我们的测量值具有较小的能量节奏，以解决该能量区域现有的厚目标产量数据集的差异和稀疏度。我们发现与现有数据集的一般共识，包括从横截面数据得出的收益率，同时解决现有的厚目标收益率数据集之间的差异，以$e_α\ of4 \ oft4-5 $ 〜MEV。但是，对于$e_α<3.5 $ 〜MEV，我们的结果大大低于以前的厚目标收益数据，并且略大于从现有横截面数据中计算出的产量。我们的数据完成了估算$^{27} {\ rm al}（α，n）$对中微子和暗物质检测器背景的贡献所需的能量范围，并导致$^{27} {\ rm al}（α，n）$作为融合设施的$^{27} {\ rm al}（α，n）$，例如具有融合设施的融合设施。
We present results from direct measurements of the $^{27}{\rm Al}(α,n)$ thick target yield from laboratory incident energies $E_α\approx$ 3$-$5~MeV, performed with the $^{3}$HeBF$_{3}$ Giant Barrel (HeBGB) neutron detector at the Edwards Accelerator Laboratory. Our measurements have a small energy cadence in order to address discrepancies and sparseness of thick-target yield data sets existing for this energy region. We find general agreement with existing data sets, including yields derived from cross section data, while resolving a discrepancy between existing thick-target yield data sets for $E_α\approx4-5$~MeV. However, for $E_α<3.5$~MeV, our results are substantially lower than previous thick-target yield data and somewhat larger than yields calculated from existing cross section data. Our data complete the energy-range needed for estimates of the $^{27}{\rm Al}(α,n)$ contribution to neutrino and dark matter detector backgrounds and result in increased viability of $^{27}{\rm Al}(α,n)$ as a plasma diagnostic tool at fusion facilities such as the National Ignition Facility.
