{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:KL2LIEICHAJXAPH3T33MWP67W2","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":"72582568a3fc8c9e10df93e6cbd0b7dead17f7bc64711301aeef0940aec349f1","cross_cats_sorted":["astro-ph.SR","hep-ph","nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2015-07-16T18:02:35Z","title_canon_sha256":"4ed545cec971dca0bb71269f0a9f2b01f9c1960b789c616e40989d97d0a2f8ed"},"schema_version":"1.0","source":{"id":"1507.04675","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.04675","created_at":"2026-05-18T01:17:43Z"},{"alias_kind":"arxiv_version","alias_value":"1507.04675v2","created_at":"2026-05-18T01:17:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.04675","created_at":"2026-05-18T01:17:43Z"},{"alias_kind":"pith_short_12","alias_value":"KL2LIEICHAJX","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"KL2LIEICHAJXAPH3","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"KL2LIEIC","created_at":"2026-05-18T12:29:29Z"}],"graph_snapshots":[{"event_id":"sha256:67fa75c1f820710e31ffc65840de614491eecf71b6252310db7aa3f34cff8878","target":"graph","created_at":"2026-05-18T01:17:43Z","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":"Based on mean field calculations with Skyrme interactions, we extract a constraint on the isovector effective mass in nuclear matter at saturation density $\\rho_0$, i.e., $m_{v}^{\\ast}(\\rho_0)=(0.77\\pm0.03) m$ by combining the experimental data of the centroid energy of the isovector giant dipole resonance (IVGDR) and the electric dipole polarizability $\\alpha_{\\mathrm{D}}$ in $^{208}$Pb. Meanwhile, the isoscalar effective mass at $\\rho_0$ is determined to be $m_{s}^{\\ast}(\\rho_0)=(0.91\\pm0.05) m$ by analyzing the measured excitation energy of the isoscalar giant quadrupole resonance (ISGQR) i","authors_text":"Lie-Wen Chen, Zhen Zhang","cross_cats":["astro-ph.SR","hep-ph","nucl-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2015-07-16T18:02:35Z","title":"Isospin splitting of nucleon effective mass from giant resonances in $^{208}$Pb"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.04675","kind":"arxiv","version":2},"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":"sha256:98324ece19348fa59e0ed2e58eefdaf6b428fd40f571599566b1b73c46ad7fa3","target":"record","created_at":"2026-05-18T01:17:43Z","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":"72582568a3fc8c9e10df93e6cbd0b7dead17f7bc64711301aeef0940aec349f1","cross_cats_sorted":["astro-ph.SR","hep-ph","nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2015-07-16T18:02:35Z","title_canon_sha256":"4ed545cec971dca0bb71269f0a9f2b01f9c1960b789c616e40989d97d0a2f8ed"},"schema_version":"1.0","source":{"id":"1507.04675","kind":"arxiv","version":2}},"canonical_sha256":"52f4b411023813703cfb9ef6cb3fdfb6981a46873663bde5404162ff911d89a2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"52f4b411023813703cfb9ef6cb3fdfb6981a46873663bde5404162ff911d89a2","first_computed_at":"2026-05-18T01:17:43.818107Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:17:43.818107Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UEj+HRtQiiBszY1TjVaEgaQsXJsnAljh8jYbFV6xRrqJiFmk2W7OlZ1aW8wCRzl1MqJDlTIweXGisTQenndWBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:17:43.818784Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.04675","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:98324ece19348fa59e0ed2e58eefdaf6b428fd40f571599566b1b73c46ad7fa3","sha256:67fa75c1f820710e31ffc65840de614491eecf71b6252310db7aa3f34cff8878"],"state_sha256":"80148098cc46f2502d1914389c6f5f34f18f0204727898cf025f3bd3725ea944"}