{"paper":{"title":"Shell evolution approaching the N=20 island of inversion: structure of 26Na","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A.B. Garnsworthy, A.J. Boston, A. Matta, B.R. Fulton, C.Aa. Diget, C.E. Svensson, C.J. Pearson, C. Sumithrarachchi, C. Unsworth, D. Jamieson, D.S. Cross, D. Smalley, E.C. Simpson, F. Sarazin, G.C. Ball, G. Hackman, G.L. Wilson, H. Al Falou, H.C. Boston, I.C. Celik, J.C. Blackmon, J.N. Orce, K.G. Leach, M. Djongolov, M. Porter-Peden, N.A. Orr, N. Galinski, N.L. Achouri, R.A.E. Austin, R. Ashley, R. Kanungo, R. Wadsworth, S.J. Williams, S.M. Brown, S.P. Fox, S. Sjue, S. Triambak, T.E. Drake, U. Hager, W.N. Catford","submitted_at":"2015-08-07T16:41:26Z","abstract_excerpt":"The levels in 26Na with single particle character have been observed for the first time using the d(25Na,p gamma) reaction at 5 MeV/nucleon. The measured excitation energies and the deduced spectroscopic factors are in good overall agreement with (0+1) hbar-omega shell model calculations performed in a complete spsdfp basis and incorporating a reduction in the N=20 gap. Notably, the 1p3/2 neutron configuration was found to play an enhanced role in the structure of the low-lying negative parity states in 26Na, compared to the isotone 28Al. Thus, the lowering of the 1p3/2 orbital relative to the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.01757","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"}