{"paper":{"title":"Measurement of the neutron $\\beta$-asymmetry parameter $A_0$ with ultracold neutrons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Garcia, A. Perez Galvan, A.R. Young, A. Saunders, A.T. Holley, B. Hona, B. Tipton, B. VornDick, B.W. Filippone, C.L. Morris, C. Wrede, C.-Y. Liu, D. Melconian, E. Tatar, G.E. Hogan, H.O. Back, H. Yan, J.C. Ramsey, J. Hoagland, J. Liu, Jr., J.W. Martin, J. Yuan, K.P. Hickerson, L.J. Broussard, M.L. Pitt, M. Makela, M.P. Mendenhall, P. Geltenbort, R.B. Vogelaar, R. Carr, R. Mortensen, R. Rios, R.R. Mammei, R. Russell, R. Schmid, R.W. Pattie, S. Clayton, S. Currie, S.J. Seestrom, S. Sjue, T.J. Bowles, T.M. Ito, UCNA Collaboration: B. Plaster, W.E. Sondheim, Y.P. Xu","submitted_at":"2012-07-25T04:55:28Z","abstract_excerpt":"We present a detailed report of a measurement of the neutron $\\beta$-asymmetry parameter $A_0$, the parity-violating angular correlation between the neutron spin and the decay electron momentum, performed with polarized ultracold neutrons (UCN). UCN were extracted from a pulsed spallation solid deuterium source and polarized via transport through a 7-T magnetic field. The polarized UCN were then transported through an adiabatic-fast-passage spin-flipper field region, prior to storage in a cylindrical decay volume situated within a 1-T $2 \\times 2\\pi$ solenoidal spectrometer. The asymmetry was "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.5887","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"}