{"paper":{"title":"Exclusive Measurement of the $pp \\to nn\\pi^+\\pi^+$ Reaction at 1.1 GeV","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"nucl-ex","authors_text":"A. Kupsc, A. Povtorejko, A. Yamamoto, B. Hoistad, B. Morosov, B. Shwartz, C. Ekstrom, C. Pauly, D. Bogoslawsky, E. Doroshkevich, E. Jiganov, F. Kren, G. Ivanov, G.J. Wagner, H. Calen, H. Clement, H. Petren, I. Koch, J. Stepaniak, J. Zabierowski, J. Zlomanczuk, K. Fransson, K. Schonning, L. Demiroers, L. Gustafsson, M. Bashkanov, M. Jacewicz, M. Wolke, O. Khakimova, P.Marciniewski, P. Thorngren-Engblom, R.J.M.Y. Ruber, R. Meier, S. Keleta, S. Kullander, T. Johansson, V. Tikhomirov, W. Scobel, Y. Petukhov","submitted_at":"2010-12-07T11:05:04Z","abstract_excerpt":"First exclusive data for the $pp \\to nn\\pi^+\\pi^+$ reaction have been obtained at CELSIUS with the WASA detector setup at a beam energy of $T_p$ = 1.1 GeV. Total and differential cross sections disagree with theoretical calculations, which predict the $\\Delta\\Delta$ excitation to be the dominant process at this beam energy. Instead the data require the excitation of a higher-lying $\\Delta$ state, most likely the $\\Delta(1600)$, to be the leading process."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1012.1463","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"}