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A New High-Intensity Source for Ultracold Neutrons
Abstract
The TRIUMF UltraCold Advanced Neutron (TUCAN) collaboration has completed a new superthermal source for ultracold neutrons (UCNs) at TRIUMF. Neutrons produced in a spallation target are moderated in heavy water and liquid deuterium, and are converted to ultracold neutrons by inelastic scattering inside superfluid 4He at around 1.1 K. During commissioning of the completed moderation and conversion system, including the liquid-deuterium moderator, up to 1.47(2)× 107 UCNs were detected outside the source in the experimental area following a 60 s accumulation period. At the same location, continuous operation produced detector rates of up to 6.75(3)× 107 UCN/s, and a density of 165.6(1) UCN/cm3 was achieved in a 25.4 L external vessel. These measurements demonstrate high-intensity operation of a spallation-driven He-II UCN source, including extraction and transport to an external experimental area.
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BibTeX
@misc{abe2026highintensity,
title = {{A New High-Intensity Source for Ultracold Neutrons}},
author = {K. Abe and S. Ahmed and B. Algohi and D. Anthony and L. Barron-Palos and Y. Bylinsky and M. Bosse and M. P. Bradley and A. Brossard and J. Chak and R. Chiba and C. Davis and R. de Vries and K. Dong and K. Drury and B. Franke and D. Fujimoto and R. Fujitani and M. Gericke and P. Giampa and C. Gibson and R. Golub and K. Hatanaka and T. Hepworth and T. Higuchi and A. Jaison and B. Jamieson and K. Jorgensen-Fullam and M. Katotoka and S. Kawasaki and M. Kitaguchi and W. Klassen and E. Klemets and E. Korkmaz and E. Korobkina and F. Kuchler and C. Lamb and M. Lavvaf and A. Lejuez and T. Lightbody and T. Lindner and S. Longo and K. W. Madison and J. Malcolm and J. Mammei and R. Mammei and C. Marshall and J. W. Martin and R. Matsumiya and M. McCrea and E. Miller and M. Miller and K. Mishima and T. Mohammadi and T. Momose and M. Nalbandian and T. Okamura and S. Pankratz and R. Patni and R. Picker},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2607.03033},
eprint = {2607.03033},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.03033},
}
RIS
TY - UNPB
TI - A New High-Intensity Source for Ultracold Neutrons
AU - K. Abe
AU - S. Ahmed
AU - B. Algohi
AU - D. Anthony
AU - L. Barron-Palos
AU - Y. Bylinsky
AU - M. Bosse
AU - M. P. Bradley
AU - A. Brossard
AU - J. Chak
AU - R. Chiba
AU - C. Davis
AU - R. de Vries
AU - K. Dong
AU - K. Drury
AU - B. Franke
AU - D. Fujimoto
AU - R. Fujitani
AU - M. Gericke
AU - P. Giampa
AU - C. Gibson
AU - R. Golub
AU - K. Hatanaka
AU - T. Hepworth
AU - T. Higuchi
AU - A. Jaison
AU - B. Jamieson
AU - K. Jorgensen-Fullam
AU - M. Katotoka
AU - S. Kawasaki
AU - M. Kitaguchi
AU - W. Klassen
AU - E. Klemets
AU - E. Korkmaz
AU - E. Korobkina
AU - F. Kuchler
AU - C. Lamb
AU - M. Lavvaf
AU - A. Lejuez
AU - T. Lightbody
AU - T. Lindner
AU - S. Longo
AU - K. W. Madison
AU - J. Malcolm
AU - J. Mammei
AU - R. Mammei
AU - C. Marshall
AU - J. W. Martin
AU - R. Matsumiya
AU - M. McCrea
AU - E. Miller
AU - M. Miller
AU - K. Mishima
AU - T. Mohammadi
AU - T. Momose
AU - M. Nalbandian
AU - T. Okamura
AU - S. Pankratz
AU - R. Patni
AU - R. Picker
PY - 2026
DA - 2026/10/16
PB - arXiv
DO - 10.48550/arxiv.2607.03033
UR - https://arxiv.org/abs/2607.03033
AB - The TRIUMF UltraCold Advanced Neutron (TUCAN) collaboration has completed a new superthermal source for ultracold neutrons (UCNs) at TRIUMF. Neutrons produced in a spallation target are moderated in heavy water and liquid deuterium, and are converted to ultracold neutrons by inelastic scattering inside superfluid ^4He at around 1.1 K. During commissioning of the completed moderation and conversion system, including the liquid-deuterium moderator, up to 1.47(2)× 10^7 UCNs were detected outside the source in the experimental area following a 60 s accumulation period. At the same location, continuous operation produced detector rates of up to 6.75(3)× 10^7 UCN/s, and a density of 165.6(1) UCN/cm^3 was achieved in a 25.4 L external vessel. These measurements demonstrate high-intensity operation of a spallation-driven He-II UCN source, including extraction and transport to an external experimental area.
ER -