{"paper":{"title":"Detailed Report of the MuLan Measurement of the Positive Muon Lifetime and Determination of the Fermi Constant","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex","physics.ins-det"],"primary_cat":"hep-ex","authors_text":"A. Gafarov, B. Johnson, B. Kiburg, B. Lauss, B. L. Roberts, B. Wolfe, C. J. G. Onderwater, D. B. Chitwood, D. M. Webber, D. W. Hertzog, F. E. Gray, F. Mulhauser, I. Logashenko, J. Crnkovic, J. Kunkle, J. Phillips, J. P. Miller, K. Giovanetti, K. R. Lynch, P. Kammel, P. T. Debevec, P. Winter, Q. Peng, R. M. Carey, R. McNabb, S. Battu, S. Dhamija, S. Kizilgul, S. Rath, T. P. Gorringe, V. Tishchenko, W. Earle, Z. Hartwig","submitted_at":"2012-11-05T18:12:19Z","abstract_excerpt":"We present a detailed report of the method, setup, analysis and results of a precision measurement of the positive muon lifetime. The experiment was conducted at the Paul Scherrer Institute using a time-structured, nearly 100%-polarized, surface muon beam and a segmented, fast-timing, plastic scintillator array. The measurement employed two target arrangements; a magnetized ferromagnetic target with a ~4 kG internal magnetic field and a crystal quartz target in a 130 G external magnetic field. Approximately 1.6 x 10^{12} positrons were accumulated and together the data yield a muon lifetime of"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1211.0960","kind":"arxiv","version":1},"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"}