用于超冷中子极化分析的铁薄膜研究
Study of Thin Iron Films for Polarization Analysis of Ultracold Neutrons
摘要：
TUCAN（TRIUMF超冷先进中子）合作旨在以前所未有的精度搜索中子电偶极矩（nEDM）。nEDM测量的基本要素之一是超冷中子（UCN）的偏振分析仪，其主要成分是磁化的薄铁膜。几个薄铁膜沉积在铝和硅基板上，并通过振动样品磁强计和冷中子反射仪进行了表征。使铁膜饱和所需的磁场对于铝基板上的铁膜为$\sim$ 12 kA/m，对于硅基板为6.4 kA/m。通过中子反射计估计Si衬底上的铁膜的磁势为2 T，这对于nEDM测量的UCN偏振分析仪是足够的性能。
英文摘要：
The TUCAN (TRIUMF Ultra-Cold Advanced Neutron) collaboration aims to search for the neutron electric dipole moment (nEDM) with unprecedented precision. One of the essential elements for the nEDM measurement is a polarization analyzer of ultracold neutrons (UCNs), whose main component is a magnetized thin iron film. Several thin iron films were deposited on aluminum and silicon ubstrates and were characterized by vibrating sample magnetometry and cold-neutron reflectometry. A magnetic field required to saturate the iron film is $\sim$12 kA/m for those on the aluminum substrates and 6.4 kA/m for the silicon substrates. The magnetic potential of the iron films on the Si substrate was estimated to be 2 T by the neutron reflectometry, which is sufficient performance for an UCN polarization analyzer of the nEDM measurement.
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