{"paper":{"title":"Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of $N = 32$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th","physics.atom-ph"],"primary_cat":"nucl-ex","authors_text":"A. Ekstr\\\"om, A. Kanellakopoulos, \\'A. Koszor\\'us, A. R. Vernon, B. K. Sahoo, B. S. Cooper, C. Forss\\'en, C. L. Binnersley, C. M. Ricketts, F. P. Gustafsson, G. Hagen, G. Neyens, G. R. Jansen, J. Billowes, K. T. Flanagan, M. Kortelainen, M. L. Bissell, P.-G. Reinhard, R. F. Garcia Ruiz, R. P. de Groote, S. Franchoo, S. G. Wilkins, S. J. Novario, S. W. Bai, T. E. Cocolios, T. Papenbrock, W. G. Jiang, W. Nazarewicz, X. F. Yang","submitted_at":"2020-12-03T12:11:01Z","abstract_excerpt":"Nuclear charge radii are sensitive probes of different aspects of the nucleon-nucleon interaction and the bulk properties of nuclear matter; thus, they provide a stringent test and challenge for nuclear theory. The calcium region has been of particular interest, as experimental evidence has suggested a new magic number at $N = 32$ [1-3], while the unexpectedly large increases in the charge radii [4,5] open new questions about the evolution of nuclear size in neutron-rich systems. By combining the collinear resonance ionization spectroscopy method with $\\beta$-decay detection, we were able to e"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.01864","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/2012.01864/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"}