{"paper":{"title":"Emergence of the N=16 shell gap in 21O","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Leprince, A. Moro, A. Navin, A. Ramus, B. A. Brown, B. Fernandez-Dominguez, B. Martin, B. Mouginot, B. Pietras, C. Force, D. Beaumel, E. C. Pollacco, F. Delaunay, F. Hammache, F. Marechal, G. de France, G. Wilson, H. Al Falou, I. Stefan, J. A. Scarpaci, J. Guillot, J. S. Thomas, L. Nalpas, M. Chartier, M. Labiche, M. Rejmund, N. A. Ashwood, N. A. Orr, N. Curtis, N. de S\\'er\\'eville, N. L. Achouri, N. Patterson, O. Sorlin, P. Haigh, R. Chapman, R. C. Lemmon, S. Franchoo, S. M. Brown, V. Lapoux, W. N. Catford, X. Mougeot, Y. Blumenfeld","submitted_at":"2010-12-18T00:06:02Z","abstract_excerpt":"The spectroscopy of 21O has been investigated using a radioactive 20O beam and the (d,p) reaction in inverse kinematics. The ground and first excited states have been determined to be Jpi=5/2+ and Jpi=1/2+ respectively. Two neutron unbound states were observed at excitation energies of 4.76 +- 0.10 and 6.16 +- 0.11. The spectroscopic factor deduced for the lower of these interpreted as a 3/2+ level, reveals a rather pure 0d3/2 single-particle configuration. The large energy difference between the 3/2+ and 1/2+ states is indicative of the emergence of the N=16 magic number. For the higher lying"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1012.4040","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":""},"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"}