Spallation Ultracold-Neutron Production in Superfluid Helium

Y. Masuda, T. Kitagaki, K. Hatanaka, M. Higuchi, S. Ishimoto, Y. Kiyanagi, K. Morimoto, S. Muto, and M. Yoshimura

Phys. Rev. Lett. 89, 284801 – Published 27 December 2002

Abstract

The first ultracold-neutron (UCN) production in superfluid helium placed in a spallation neutron source is carried out. A UCN density of $0.7 U C N / {c m}^{3}$ , which can be used in experiments, is achieved for a proton-beam power of 78 W and a He-II temperature of 1.2 K. The present new UCN source is not limited by Liouville’s theorem and extraction losses, which were serious problems in the previous sources. The present source has the possibility of extremely high-density UCN production compared with previous UCN sources.

Received 6 August 2002

DOI:https://doi.org/10.1103/PhysRevLett.89.284801

Authors & Affiliations

Y. Masuda¹, T. Kitagaki², K. Hatanaka³, M. Higuchi⁴, S. Ishimoto¹, Y. Kiyanagi⁵, K. Morimoto¹, S. Muto¹, and M. Yoshimura³

¹High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
²Faculty of Science, Tohoku University, Sendai 980-8578, Japan
³RCNP, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
⁴Faculty of Engineering, Tohoku Gakuin University, 1-13-1 Chuo, Tagajo 985-8537, Japan
⁵Faculty of Engineering, Hokkaido University, Kita 8 Nishi 5, Kita-ku, Sapporo 060-0808, Japan

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Vol. 89, Iss. 28 — 31 December 2002

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