{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:QPA3JM4ME3ZBWI4N7LD5ZZK4OH","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":"d5e5528ec064b9666db7d83844058d0309e17e491c4185cc39dd2113607e376f","cross_cats_sorted":["nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-01-02T17:33:51Z","title_canon_sha256":"53ab16c3f955a5eb2134bcbfcfc949198599ebfc2e374b5ea190a5ef760f0107"},"schema_version":"1.0","source":{"id":"1901.00455","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.00455","created_at":"2026-05-17T23:57:03Z"},{"alias_kind":"arxiv_version","alias_value":"1901.00455v1","created_at":"2026-05-17T23:57:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.00455","created_at":"2026-05-17T23:57:03Z"},{"alias_kind":"pith_short_12","alias_value":"QPA3JM4ME3ZB","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"QPA3JM4ME3ZBWI4N","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"QPA3JM4M","created_at":"2026-05-18T12:33:27Z"}],"graph_snapshots":[{"event_id":"sha256:9dce4300812aba7bd422d7a4d592ef3263d755e2d4906ea465c0c9ee6034262e","target":"graph","created_at":"2026-05-17T23:57:03Z","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"},"paper":{"abstract_excerpt":"The most neutron-rich boron isotopes 20B and 21B have been observed for the first time following proton removal from 22N and 22C at energies around 230 MeV/nucleon. Both nuclei were found to exist as resonances which were detected through their decay into 19B and one or two neutrons. Two-proton removal from 22N populated a prominent resonance-like structure in 20B at around 2.5 MeV above the one-neutron decay threshold, which is interpreted as arising from the closely spaced 1-,2- ground-state doublet predicted by the shell model. In the case of proton removal from 22C, the 19B plus one- and t","authors_text":"A.G. Tuff, A. Navin, D. Kameda, D. Kanno, D. Murai, F. Delaunay, F.M. Marqu\\'es, H. Baba, H. Otsu, H. Sato, H. Suzuki, H. Takeda, J. Bonnard, J. Gibelin, J. Lee, J.W. Hwang, K. Muto, K. Takahashi, K. Yoneda, M. Vandebrouck, N.A. Orr, N. Fukuda, N. Inabe, N. Kobayashi, N.L. Achouri, N. Michel, N. Nakatsuka, P. Doornenbal, Q. Deshayes, R. Minakata, R. Tanaka, S. Kim, S. Leblond, S. Nishi, S. Ogoshi, S. Takeuchi, T. Aumann, T. Isobe, T. Kobayashi, T. Kubo, T. Motobayashi, T. Murakami, T. Nakamura, T. Nakashima, Y. Kondo, Y. Satou, Y. Shimizu, Y. Togano","cross_cats":["nucl-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-01-02T17:33:51Z","title":"First observation of 20B and 21B"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.00455","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:a1e2ec0d50d3e9c2ec7abd5edc3b59d3fe7a103bb99d392636a3e565aa47cf6f","target":"record","created_at":"2026-05-17T23:57:03Z","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":"d5e5528ec064b9666db7d83844058d0309e17e491c4185cc39dd2113607e376f","cross_cats_sorted":["nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-01-02T17:33:51Z","title_canon_sha256":"53ab16c3f955a5eb2134bcbfcfc949198599ebfc2e374b5ea190a5ef760f0107"},"schema_version":"1.0","source":{"id":"1901.00455","kind":"arxiv","version":1}},"canonical_sha256":"83c1b4b38c26f21b238dfac7dce55c71e983b35863ebeca86841ce757959e1e2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"83c1b4b38c26f21b238dfac7dce55c71e983b35863ebeca86841ce757959e1e2","first_computed_at":"2026-05-17T23:57:03.795784Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:57:03.795784Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YVmiCeYwVi5JQAtk36uU44Gv0xawWYRQZvk5PhX4Vac/0vkzAEejsgXB7gLlo8I8CrpPCW/1QCnvZEAUQ4yJDw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:57:03.796513Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.00455","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a1e2ec0d50d3e9c2ec7abd5edc3b59d3fe7a103bb99d392636a3e565aa47cf6f","sha256:9dce4300812aba7bd422d7a4d592ef3263d755e2d4906ea465c0c9ee6034262e"],"state_sha256":"db41bfb710a2e81865745e2b88fc4cb2e0e51a9aca91398d98cec56d704f7396"}