{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:BG2K7JLRMFFG6Q7WKVG73IMUUO","short_pith_number":"pith:BG2K7JLR","schema_version":"1.0","canonical_sha256":"09b4afa571614a6f43f6554dfda194a3b9176ab7066363a820ed93abd5948670","source":{"kind":"arxiv","id":"1901.01741","version":1},"attestation_state":"computed","paper":{"title":"Observation of excited states in $^{20}$Mg sheds light on nuclear forces and shell evolution","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"nucl-ex","authors_text":"A. A. Chen, A. Chester, A. Shotter, B. Davids, C. Andreoiu, C. Barnes, C. Burbadge, D. Burke, D. Kisliuk, E. McGee, E. Padilla-Rodal, G. Christian, G. Hackman, G. Hagen, G. R. Jansen, I.J. Thompson, J. D. Holt, J.Even, J. Henderson, J. Liang, J. Lighthall, J. Measures, J. S. Randhawa, J. Turko, M. Alcorta, M. Holl, M. Keefe, M. Moukaddam, M.Williams, O. Workman, P. Jassal, P. Navratil, R. Kanungo, R. Krucken, S. Cruz, S. Ishimoto, S. Kaur, S. R. Stroberg","submitted_at":"2019-01-07T10:38:06Z","abstract_excerpt":"The exotic Borromean nucleus $^{20}$Mg with $N$ = 8, located at the proton drip-line provides a unique testing ground for nuclear forces and the evolution of shell structure in the neutron-deficient region. We report on the first observation of proton unbound resonances together with bound states in $^{20}$Mg from the $^{20}$Mg($d$,$d'$) reaction performed at TRIUMF. Phenomenological shell-model calculations offer a reasonable description. However, our experimental results present a challenge for current first-principles nuclear structure approaches and point to the need for improved chiral fo"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1901.01741","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-01-07T10:38:06Z","cross_cats_sorted":["nucl-th"],"title_canon_sha256":"ce0b3c7c969475b332a2125b8ebc6336383ed97718d3ddba1f9af4be70385fec","abstract_canon_sha256":"005e989f64ec914b979e903252e2caa0430a2435dbfc4b19b1bd997b969ef2e1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:46:45.835485Z","signature_b64":"Qsy6hleCdePvQtboO3eL5w9oMa2dLnA4EcGctKs+JVbiFzIdiOc6ITQ33QbleoUOuvde9tziAuN1k3/Rn14EDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"09b4afa571614a6f43f6554dfda194a3b9176ab7066363a820ed93abd5948670","last_reissued_at":"2026-05-17T23:46:45.834986Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:46:45.834986Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Observation of excited states in $^{20}$Mg sheds light on nuclear forces and shell evolution","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"nucl-ex","authors_text":"A. A. Chen, A. Chester, A. Shotter, B. Davids, C. Andreoiu, C. Barnes, C. Burbadge, D. Burke, D. Kisliuk, E. McGee, E. Padilla-Rodal, G. Christian, G. Hackman, G. Hagen, G. R. Jansen, I.J. Thompson, J. D. Holt, J.Even, J. Henderson, J. Liang, J. Lighthall, J. Measures, J. S. Randhawa, J. Turko, M. Alcorta, M. Holl, M. Keefe, M. Moukaddam, M.Williams, O. Workman, P. Jassal, P. Navratil, R. Kanungo, R. Krucken, S. Cruz, S. Ishimoto, S. Kaur, S. R. Stroberg","submitted_at":"2019-01-07T10:38:06Z","abstract_excerpt":"The exotic Borromean nucleus $^{20}$Mg with $N$ = 8, located at the proton drip-line provides a unique testing ground for nuclear forces and the evolution of shell structure in the neutron-deficient region. We report on the first observation of proton unbound resonances together with bound states in $^{20}$Mg from the $^{20}$Mg($d$,$d'$) reaction performed at TRIUMF. Phenomenological shell-model calculations offer a reasonable description. However, our experimental results present a challenge for current first-principles nuclear structure approaches and point to the need for improved chiral fo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.01741","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1901.01741","created_at":"2026-05-17T23:46:45.835059+00:00"},{"alias_kind":"arxiv_version","alias_value":"1901.01741v1","created_at":"2026-05-17T23:46:45.835059+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.01741","created_at":"2026-05-17T23:46:45.835059+00:00"},{"alias_kind":"pith_short_12","alias_value":"BG2K7JLRMFFG","created_at":"2026-05-18T12:33:12.712433+00:00"},{"alias_kind":"pith_short_16","alias_value":"BG2K7JLRMFFG6Q7W","created_at":"2026-05-18T12:33:12.712433+00:00"},{"alias_kind":"pith_short_8","alias_value":"BG2K7JLR","created_at":"2026-05-18T12:33:12.712433+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/BG2K7JLRMFFG6Q7WKVG73IMUUO","json":"https://pith.science/pith/BG2K7JLRMFFG6Q7WKVG73IMUUO.json","graph_json":"https://pith.science/api/pith-number/BG2K7JLRMFFG6Q7WKVG73IMUUO/graph.json","events_json":"https://pith.science/api/pith-number/BG2K7JLRMFFG6Q7WKVG73IMUUO/events.json","paper":"https://pith.science/paper/BG2K7JLR"},"agent_actions":{"view_html":"https://pith.science/pith/BG2K7JLRMFFG6Q7WKVG73IMUUO","download_json":"https://pith.science/pith/BG2K7JLRMFFG6Q7WKVG73IMUUO.json","view_paper":"https://pith.science/paper/BG2K7JLR","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1901.01741&json=true","fetch_graph":"https://pith.science/api/pith-number/BG2K7JLRMFFG6Q7WKVG73IMUUO/graph.json","fetch_events":"https://pith.science/api/pith-number/BG2K7JLRMFFG6Q7WKVG73IMUUO/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/BG2K7JLRMFFG6Q7WKVG73IMUUO/action/timestamp_anchor","attest_storage":"https://pith.science/pith/BG2K7JLRMFFG6Q7WKVG73IMUUO/action/storage_attestation","attest_author":"https://pith.science/pith/BG2K7JLRMFFG6Q7WKVG73IMUUO/action/author_attestation","sign_citation":"https://pith.science/pith/BG2K7JLRMFFG6Q7WKVG73IMUUO/action/citation_signature","submit_replication":"https://pith.science/pith/BG2K7JLRMFFG6Q7WKVG73IMUUO/action/replication_record"}},"created_at":"2026-05-17T23:46:45.835059+00:00","updated_at":"2026-05-17T23:46:45.835059+00:00"}