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 ∼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.
@article{arxiv.2207.08441,
title = {Study of Thin Iron Films for Polarization Analysis of Ultracold Neutrons},
author = {Hiroaki Akatsuka and Takashi Higuchi and Sean Hansen-Romu and Kichiji Hatanaka and Tomohiro Hayamizu and Masahiro Hino and Go Ichikawa and Sohei Imajo and Blair Jamieson and Shinsuke Kawasaki and Masaaki Kitaguchi and Ryohei Matsumiya and Kenji Mishima},
journal= {arXiv preprint arXiv:2207.08441},
year = {2022}
}
Comments
Proceedings of the 24th International Spin Symposium (SPIN 2021), 18-22 October 2021, Matsue, Japan