从IsoDAR中获取最多的中微子
Getting the Most Neutrinos out of IsoDAR
摘要：
世界范围内的几个实验合作计划通过测量由静止同位素衰变（IsoDAR）产生的反中微子的消失来测试无菌中微子模型。这些方案中最先进的方案具有非常相似的设置，其中质子束撞击靶产生中子，中子被高同位素纯度的7Li转换器吸收，产生8Li，其产生的衰变产生反中微子。在本说明中，我们使用FLUKA和GEANT4模拟来研究该标准提案的三个拟议修改。在第一种情况下，7Li被包括氘减速剂的7Li化合物取代。在第二种情况下，在靶和转换器之间放置间隙以减少中子反弹。最后，我们考虑用液氮冷却转炉。我们发现，这些修改可以增加反中微子产率高达百分之五十。第一种方法还显著减少了所需的高纯度7Li的量。
英文摘要：
Several experimental collaborations worldwide intend to test sterile neutrino models by measuring the disappearance of antineutrinos produced via isotope decay at rest (IsoDAR). The most advanced of these proposals have very similar setups, in which a proton beam strikes a target yielding neutrons which are absorbed by a high isotopic purity 7Li converter, yielding 8Li whose resulting decay yields the antineutrinos. In this note, we use FLUKA and GEANT4 simulations to investigate three proposed modifications of this standard proposal. In the first, the 7Li is replaced with 7Li compounds including a deuterium moderator. In the second, a gap is placed between the target and the converter to reduce the neutron bounce-back. Finally, we consider cooling the converter with liquid nitrogen. We find that these modifications can increase the antineutrino yield by as much as 50 percent. The first also substantially reduces the quantity of high purity 7Li which is needed.
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