{"paper":{"title":"ABC Effect in Basic Double-Pionic Fusion --- Observation of a new resonance?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Jany, A. Khoukaz, A. Kupsc, A. Magiera, A. Passfeld, A. Povtoreyko, A. Pricking, A. Roy, A. Schmidt, A. Szczurek, A. Taeschner, A. Trzcinski, A. Winnemoeller, A. Wirzba, A. Wronska, B. Hoistad, B. Kamys, B. Klos, B.K. Nandi, B. Lorentz, B. Marianski, B.R. Jany, C. Adolph, C. Ekstrom, C.F. Redmer, C. Hanhart, C.-O. Gullstrom, C. Pauly, D. Coderre, D. Prasuhn, E. Czerwinski, E. Doroshkevich, E. Perez del Rio, F. Goldenbaum, F. Hinterberger, F. Kren, F.S. Bergmann, G.J. Wagner, G. Kemmerling, G. Sterzenbach, H. Bhatt, H. Calen, H. Clement, H. Kleines, H. Ohm, H.-P. Morsch, H. Stockhorst, H. Stroeher, J. Hampe, J. Jaus, J. Klaja, J. Ritman, J. Smyrski, J. Stepaniak, J. Zabierowski, J. Zlomanczuk, K. Foehl, K. Fransson, K. Grigoryev, K. Lalwani, K. Pysz, K.-T. Brinkmann, L. Heijkenskj, L. Jarczyk, L. Yurev, M. Bashkanov, M. Berlowski, M. Buescher, M. Hodana, M. Jacewicz, M. Janusz, M.J. Zielinski, M. Mikirtychiants, M. Siemaszko, M. Skurzok, M. Wolke, N. Piskunov, N. Shah, O. Khakimova, P. Adlarson, P. Fedorets, P. Goslawski, P. Kulessa, P. Marciniewski, P. Moskal, P. Plucinski, P. Podkopal, P. Vlasov, P. Wuestner, P. Wurm, P. Zupranski, R. Engels, R.J.M.Y. Ruber, R. Maier, R. Siudak, R. Stassen, R. Varma, S. Kistryn, S. Kullander, S. Schadmand, T. Johansson, T. Rausmann, T. Sefzick, T. Skorodko, T. Tolba, V. Baru, V. Grishina, V. Hejny, V. Serdyuk, V. Sopov, W. Augustyniak, W. Erven, W. Eyrich, W. Krzemien, W. Schroeder, W. Weglorz, W. Zipper, Y. Petukhov, Z. Rudy","submitted_at":"2011-04-01T09:53:49Z","abstract_excerpt":"We report on a high-statistics measurement of the basic double pionic fusion reaction $pn \\to d\\pi^0\\pi^0$ over the energy region of the so-called ABC effect, a pronounced low-mass enhancement in the $\\pi\\pi$-invariant mass spectrum. The measurements were performed with the WASA detector setup at COSY. The data reveal the ABC effect to be associated with a Lorentzian shaped energy dependence in the integral cross section. The observables are consistent with a resonance with $I(J^P) =0(3^+)$ in both $pn$ and $\\Delta\\Delta$ systems. Necessary further tests of the resonance interpretation are dis"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1104.0123","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"}