论文标题

Triumf超电压中子源和电偶极矩设备的估计性能

Estimated performance of the TRIUMF ultracold neutron source and electric dipole moment apparatus

论文作者

Sidhu, Steve, Schreyer, Wolfgang, Vanbergen, Sean, Kawasaki, Shinsuke, Matsumiya, Ryohei, Okamura, Takahiro, Picker, Ruediger

论文摘要

搜索中子(NEDM)的永久性电偶极矩(NEDM)对粒子物理的标准模型以外的理论提供了强大的限制。 Tucan合作构建了一个超速中子(UCN)的来源和一个设备,可以在加拿大温哥华的Triumf搜索NEDM。 在这项工作中,我们估计,基于超级荧光氦转换器的剥离驱动的UCN源将提供$(1.38 \ pm0.02)\ times 10^7 $偏振UCN,密度为$ 217 \ pm3 $ 〜ucn/cm $^3 $的密度为$ 217 \ pm3 $ 〜uc〜pm 3 $^3 $。 使用$(1.51 \ pm0.02)\ times 10^6 $中子在拉姆西周期后检测到的中子,每个存储周期的NEDM搜索的统计灵敏度将为$(1.94 \ pm0.06)\ times 10^{ - 25} \ times 10^{ - 25} \,E $ CM(1 $σ$)。 $ 10^{ - 27} \的目标灵敏度可以在$ 280 \ pm16 $测量天内达到E $ cm(1 $σ$)。

Searches for the permanent electric dipole moment of the neutron (nEDM) provide strong constraints on theories beyond the Standard Model of particle physics. The TUCAN collaboration is constructing a source for ultracold neutrons (UCN) and an apparatus to search for the nEDM at TRIUMF, Vancouver, Canada. In this work, we estimate that the spallation-driven UCN source based on a superfluid helium converter will provide $(1.38\pm0.02) \times 10^7$ polarized UCN at a density of $217\pm3$~UCN/cm$^3$ to a room-temperature EDM experiment per fill. With $(1.51\pm0.02) \times 10^6$ neutrons detected after the Ramsey cycle, the statistical sensitivity for an nEDM search per storage cycle will be $(1.94\pm0.06) \times 10^{-25}\,e$cm (1$σ$). The goal sensitivity of $10^{-27}\,e$cm (1$σ$) can be reached within $280\pm16$ measurement days.

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