{"paper":{"title":"A new determination of the fine structure constant based on Bloch oscillations of ultracold atoms in a vertical optical lattic","license":"","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"Catherine Schwob (LKB - Jussieu), Estefania De Mirandes (LKB - Jussieu), Fran\\c{c}ois Biraben (LKB - Jussieu), Fran\\c{c}ois Nez (LKB - Jussieu), Lucile Julien (LKB - Jussieu), Malo Cadoret (LKB - Jussieu), Pierre Clad\\'e (LKB - Jussieu), Sa\\\"ida Guellati-Kh\\'elifa (BNM-INM)","submitted_at":"2005-10-11T20:08:57Z","abstract_excerpt":"We report an accurate measurement of the recoil velocity of Rb atoms based on Bloch oscillations in a vertical accelerated optical lattice. We transfer about 900 recoil momenta with an efficiency of 99.97 % per recoil. A set of 72 measurements of the recoil velocity, each one with a relative uncertainty of about 33 ppb in 20 min integration time, leads to a determination of the fine structure constant alpha with a statistical relative uncertainty of 4.4 ppb. The detailed analysis of the different systematic errors yields to a relative uncertainty of 6.7 ppb. The deduced value of 1/alpha is 137"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"physics/0510101","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":""},"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"}