{"paper":{"title":"Reorientation-effect measurement of the first 2$^+$ state in $^{12}$C: confirmation of oblate deformation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"nucl-ex","authors_text":"C. J. Pearson, G. C. Ball, G. Hackman, J. N. Orce, M. Kumar Raju, P. Navratil, S. Triambak, T. E. Drake, the TIGRESS/UWC Collaboration","submitted_at":"2017-09-21T19:29:18Z","abstract_excerpt":"A Coulomb-excitation reorientation-effect measurement using the TIGRESS $\\gamma-$ray spectrometer at the TRIUMF/ISAC II facility has permitted the first determination of the $\\langle 2^+_1\\mid\\mid \\hat{E2} \\mid\\mid 2^+_1\\rangle$ diagonal matrix element in $^{12}$C from particle$-\\gamma$ coincidence data. Required state-of-the-art no-core shell model calculations of the nuclear polarizability for the ground and first-excited (2$^+_1$) states in $^{12}$C using chiral NN N$^4$LO500 and NN+3NF350 interactions have been performed. Consistent predictions show a larger polarizability than previously "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.07501","kind":"arxiv","version":2},"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"}