{"paper":{"title":"Electromagnetic properties of $^{21}$O for benchmarking nuclear Hamiltonians","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"nucl-ex","authors_text":"A. Gade, A. Hufnagel, A. Schwenk, B. A. Brown, B. Elman, B. Longfellow, C. Loelius, D. Bazin, D. Weisshaar, E. Lunderberg, H. Iwasaki, I. Syndikus, J. Belarge, J. D. Holt, J. Men\\'endez, J. Simonis, K. Vobig, K. Whitmore, M. Mathy, M. Petri, N. Kobayashi, P. Bender, R. Elder, R. Roth, S. Heil, S. Paschalis, T. Haylett, T. H\\\"uther","submitted_at":"2019-12-05T21:31:19Z","abstract_excerpt":"The structure of exotic nuclei provides valuable tests for state-of-the-art nuclear theory. In particular electromagnetic transition rates are more sensitive to aspects of nuclear forces and many-body physics than excitation energies alone. We report the first lifetime measurement of excited states in $^{21}$O, finding $\\tau_{1/2^+}=420^{+35}_{-32}\\text{(stat)}^{+34}_{-12}\\text{(sys)}$\\,ps. This result together with the deduced level scheme and branching ratio of several $\\gamma$-ray decays are compared to both phenomenological shell-model and ab initio calculations based on two- and three-nuc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1912.02884","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/1912.02884/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"}