{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:UN7DMH3GWRDERMJLHYJJG73DKC","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"b1b1bc92e106f4c054109422086501db104a0a2f9df1af03b756f1f021eb0911","cross_cats_sorted":["nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2020-05-19T14:42:46Z","title_canon_sha256":"753966732dc0ad90f4f51565b1252f40648cc123146e09a78044a9def9ca5dbb"},"schema_version":"1.0","source":{"id":"2005.09492","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2005.09492","created_at":"2026-07-05T01:08:13Z"},{"alias_kind":"arxiv_version","alias_value":"2005.09492v1","created_at":"2026-07-05T01:08:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2005.09492","created_at":"2026-07-05T01:08:13Z"},{"alias_kind":"pith_short_12","alias_value":"UN7DMH3GWRDE","created_at":"2026-07-05T01:08:13Z"},{"alias_kind":"pith_short_16","alias_value":"UN7DMH3GWRDERMJL","created_at":"2026-07-05T01:08:13Z"},{"alias_kind":"pith_short_8","alias_value":"UN7DMH3G","created_at":"2026-07-05T01:08:13Z"}],"graph_snapshots":[{"event_id":"sha256:86d5e79f4253a258efec31245a301876f56d5577dd232c3218f89b75747a7d05","target":"graph","created_at":"2026-07-05T01:08:13Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2005.09492/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report the measurement of reaction cross sections ($\\sigma_R^{\\rm ex}$) of $^{27,29}$F with a carbon target at RIKEN. The unexpectedly large $\\sigma_R^{\\rm ex}$ and derived matter radius identify $^{29}$F as the heaviest two-neutron Borromean halo to date. The halo is attributed to neutrons occupying the $2p_{3/2}$ orbital, thereby vanishing the shell closure associated with the neutron number $N = 20$. The results are explained by state-of-the-art shell model calculations. Coupled-cluster computations based on effective field theories of the strong nuclear force describe the matter radius ","authors_text":"A. Estrad\\'e, A. O. Macchiavelli, A. Prochazka, C. Scheidenberger, D. S. Ahn, D. Steppenbeck, D. Suzuki, F. Browne, G. Hagen, G. R. Jansen, H. Baba, H. Geissel, H. J. Ong, H. Sakurai, H. Suzuki, H. Takeda, I. Murray, K. Behr, K. Itahashi, K. Wimmer, K. Yoshida, M. Holl, M. L. Cort\\'es, M. Takechi, N. Fukuda, N. Iwasa, N. Tsunoda, P. Doornenbal, P. Schrock, R. Kanungo, R. Taniuchi, S. Bagchi, S. Chen, S. J. Novario, S. Kaur, S. Momiyama, S. Paschalis, S. Takeuchi, S. Y. Matsumoto, T. Nakamura, T. Otsuka, T. Papenbrock, T. Suzuki, W. G. Jiang, W. Horiuchi, Y. K. Tanaka, Y. Shimizu","cross_cats":["nucl-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2020-05-19T14:42:46Z","title":"A two-neutron halo is unveiled in $^{29}$F"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2005.09492","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:4b0d8c1473607178cbac37739de47ead72f83d91d82f23e64c3b6842f92d72df","target":"record","created_at":"2026-07-05T01:08:13Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"b1b1bc92e106f4c054109422086501db104a0a2f9df1af03b756f1f021eb0911","cross_cats_sorted":["nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2020-05-19T14:42:46Z","title_canon_sha256":"753966732dc0ad90f4f51565b1252f40648cc123146e09a78044a9def9ca5dbb"},"schema_version":"1.0","source":{"id":"2005.09492","kind":"arxiv","version":1}},"canonical_sha256":"a37e361f66b44648b12b3e12937f63509c1224609c3ede5be68d1f29119e0f0e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a37e361f66b44648b12b3e12937f63509c1224609c3ede5be68d1f29119e0f0e","first_computed_at":"2026-07-05T01:08:13.499052Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:08:13.499052Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Y4BpPMJA859Z6Ofup4DfJxxtpnVX/K7IhEH1PUvJWnEAr4MWkJZJdvWuii1FI06HRDViSAkQsfh+rNthbscsCA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:08:13.499481Z","signed_message":"canonical_sha256_bytes"},"source_id":"2005.09492","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4b0d8c1473607178cbac37739de47ead72f83d91d82f23e64c3b6842f92d72df","sha256:86d5e79f4253a258efec31245a301876f56d5577dd232c3218f89b75747a7d05"],"state_sha256":"7b74f44956246d17a44927b3143e82c086a9b8650bd79ea326b332c75bd495fc"}