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APS » Journals » Phys. Rev. Lett. » Volume 89 » Issue 28
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Phys. Rev. Lett. 89, 284801 (2002) [4 pages]

Spallation Ultracold-Neutron Production in Superfluid Helium

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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

Received 6 August 2002; published 27 December 2002

The first ultracold-neutron (UCN) production in superfluid helium placed in a spallation neutron source is carried out. A UCN density of 0.7   UCN/cm3, 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.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.284801
DOI:
10.1103/PhysRevLett.89.284801
PACS:
29.25.Dz, 28.20.–v
 
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