{"paper":{"title":"Evidence for shape coexistence in $^{120}$Sn from the first $0^+_3$ lifetime measurement","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Esmaylzadeh, C. Andreoiu, C. Michelagnoli, C.M. Petrache, E. Taddei, F. Wu, G. Colombi, J. Jolie, J.M. Daugas, J.-M. R\\'egis, L. Domenichetti, M. Beuschlein, M. Ley, P.E. Garrett, P. Spagnoletti, S. Pannu, V. Karayonchev","submitted_at":"2025-07-31T23:11:59Z","abstract_excerpt":"The lifetime of the $0^+_3$ state in $^{120}$Sn was measured for the first time applying the fast-timing technique following thermal neutron capture. The mean lifetime of $\\tau = 50(7)$~ps leads to a $E0$ transition strength of $10^3\\times \\rho^2(E0;0^+_3\\rightarrow0^+_2) = 120(50)$, suggesting shape coexistence and a high degree of mixing between the $0^+_2$ and $0^+_3$ states. With the newly measured lifetime, the $B(E2;0^+_3\\rightarrow 2^+_1)$ value is 0.50(7)~W.u., which reveals that the $\\rho^2(E0;0^+_3\\rightarrow0^+_1)$ increases by a factor of $\\approx 3.4$ from $^{116}$Sn to $^{120}$Sn"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.00204","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/2508.00204/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"}