{"paper":{"title":"Characterization of ultracold neutron production in thin solid deuterium films at the PSI Ultracold Neutron source","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["nucl-ex","physics.acc-ph"],"primary_cat":"physics.ins-det","authors_text":"B. Blau, B. Lauss, C. Doorenbos, D. Pais, D. Ries, G. Bison, G. Zsigmond, I. Rien\\\"acker, K. Kirch, M. Daum, N. Hild, P.-J. Chiu, P. Schmidt-Wellenburg, V. Kletzl, V. Talanov, W. Chen","submitted_at":"2022-11-22T09:53:45Z","abstract_excerpt":"We determined the ultracold neutron (UCN) production rate by superthermal conversion in the solid deuterium (sD$_2$) moderator of the UCN source at the Paul Scherrer Institute (PSI). In particular, we considered low amounts of less than $20\\,$mol of D$_2$, deposited on the cooled moderator vessel surfaces in thin films of a few mm thickness. We measured the isotopic ($ c_\\text{HD} < 0.2 \\, \\% $) and isomeric ($ c_\\text{para} \\le 2.7 \\, \\% $) purity of the deuterium to conclude that absorption and up-scattering at $5\\,$K have a negligible effect on the UCN yield from the thin films. We compared"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2211.12126","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2211.12126/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}