{"paper":{"title":"Study of $\\boldsymbol{\\beta}$ Decay Shape Factors in First-Forbidden Transitions with $\\boldsymbol{\\Delta I^\\pi = 0^-}$ for Reactor Antineutrino Spectra Predictions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Algora, A. Beloeuvre, A. Illana, A. Jaries, A. Kankainen, A. Laureau, A. Porta, A. Raggio, A. Tolosa, D. Etasse, D. Pitman, E. Bonnet, G. A. Alcal\\'a, H. Garcia Cabrera, I. Moore, I. Pohjalainen, J. Agramunt, J. A. Victoria, J. L. Tain, J. Romero, J. Ruotsalainen, J.-S. Stutzmann, L. Al Ayoubi, L. Giot, M. Estienne, M. Fallot, M. Hukkanen, M. Reponen, M. Stryjczyk, O. Beliuskina, R. Kean, S. Bouvier, S. Kujanp\\\"a\\\"a, T. Eronen, V. Guadilla, V. Virtanen, W. Gelletly, W. Gins, Y. Molla","submitted_at":"2026-01-09T14:17:45Z","abstract_excerpt":"The electron spectra of the $\\beta$ decays of $^{92}$Rb and $^{142}$Cs, key contributors to the reactor antineutrino spectrum, were measured at the IGISOL facility using radioactive beams of high isotopic purity. The shapes of the measured $\\beta$ spectra were compared with various $\\beta$ shape models, including first-forbidden correction factors for $\\Delta I^\\pi = 0^-$ ground-state to ground-state transitions. Comparisons with previous experimental results are also provided. The shapes of the newly measured $\\beta$ spectra are well reproduced employing feedings extracted from total absorpti"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2601.05804","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/2601.05804/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"}