{"paper":{"title":"First ultracold neutrons produced at TRIUMF","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["nucl-ex"],"primary_cat":"physics.ins-det","authors_text":"A. Konaka, A. Sikora, B. Bell, B. Franke, B. Jamieson, B. Thorsteinson, C. A. Davis, C. P. Bidinosti, D. Jones, E. Altiere, E. Cudmore, E. Korkmaz, E. Miller, E. Pierre, F. Kuchler, F. Rehm, H. M. Shimizu, I. Tanihata, J. Mammei, J. Smith, J. W. Martin, K. Hatanaka, K. Mishima, K. W. Madison, L. Lee, L. Rebenitsch, M. Das, M. Gericke, M. Kitaguchi, M. Lang, P. Giampa, P. Gnyp, R. Mammei, R. Matsumiya, R. Picker, S. Ahmed, S. Hansen-Romu, S. Kawasaki, S. Page, S. Sidhu, S. Vanbergen, T. Andalib, T. Hayamizu, T. Kikawa, T. Lindner, T. Momose, T. Okamura, W. D. Ramsay, W. Klassen, W. Schreyer, W. T. H. van Oers, Y. Makida, Y. X. Watanabe","submitted_at":"2018-09-11T00:13:34Z","abstract_excerpt":"We installed a source for ultracold neutrons at a new, dedicated spallation target at TRIUMF. The source was originally developed in Japan and uses a superfluid-helium converter cooled to 0.9$\\,$K. During an extensive test campaign in November 2017, we extracted up to 325000 ultracold neutrons after a one-minute irradiation of the target, over three times more than previously achieved with this source. The corresponding ultracold-neutron density in the whole production and guide volume is 5.3$\\,$cm$^{-3}$. The storage lifetime of ultracold neutrons in the source was initially 37$\\,$s and dropp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.04071","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}