{"paper":{"title":"Observation of strong final-state effects in pi+ production in pp collisions at 400 MeV","license":"","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Betsch, A. Johansson, A. Kupsc, A. Mortsell, A. Sukhanov, A. Turowiecki, A. Zernov, B. Hoistad, B. Morosov, C. Ekstrom, G.J. Wagner, G. Kurz, H. Calen, H. Clement, J. Dyring, J. Johanson, J. Stepaniak, J. Zabierowski, J. Zlomanczuk, K. Fransson, K. Kilian, L. Gustafsson, M.G. Schepkin, P. Marciniewski, R. Bilger, R.J.M.Y. Ruber, S. Haggstrom, S. Kullander, T. Johansson, W. Brodowski, W. Oelert, Z. Wilhelmi","submitted_at":"1998-10-13T11:08:07Z","abstract_excerpt":"Differential cross sections of the reactions $pp \\to d\\pi^+$ and $pp \\to pn\\pi^+$ have been measured at $T_p = 400$ MeV by detecting the charged ejectiles in the angular range $4^0 \\leq \\Theta_{Lab} \\leq 21^\\circ$. The deduced total cross sections agree well with those published previously for neighbouring energies. The invariant mass spectra are observed to be strongly affected by $\\Delta$ production and $NN$ final-state interaction. The data are well described by Monte Carlo simulations including both these effects. The ratio of $pp \\to pn\\pi^+$ and $pp \\to d\\pi^+$ cross sections also compar"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-ex/9810009","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/nucl-ex/9810009/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"}