The detection of low-frequency gravitational waves on Earth requires the reduction of displacement noise, which dominates the low-frequency band. One method to cancel test mass displacement noise is a neutron displacement-noise-free interferometer (DFI). This paper proposes a new neutron DFI configuration, a Sagnac-type neutron DFI, which uses a Sagnac interferometer in place of the Mach-Zehnder interferometer. We demonstrate that a sensitivity of the Sagnac-type neutron DFI is higher than that of a conventional neutron DFI with the same interferometer scale. This configuration is particularly significant for neutron DFIs with limited space for construction and limited flux from available neutron sources.
@article{arxiv.2311.07063,
title = {Sagnac-type neutron displacement-noise-free interferometeric gravitational-wave detector},
author = {Yuki Kawasaki and Shoki Iwaguchi and Tomohiro Ishikawa and Atsushi Nishizawa and Masaaki Kitaguchi and Yutaka Yamagata and Yanbei Chen and Bin Wu and Ryuma Shimizu and Kurumi Umemura and Kenji Tsuji and Hirohiko Shimizu and Yuta Michimura and Kazuhiro Kobayashi and Takafumi Onishi and Seiji Kawamura},
journal= {arXiv preprint arXiv:2311.07063},
year = {2024}
}