{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:MFRCJG6XPW5K7RQYGB5V5SI6EC","short_pith_number":"pith:MFRCJG6X","canonical_record":{"source":{"id":"1309.0037","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-08-30T21:51:52Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"6301f0d47303c71e0b50a9ba2d6210fdcf65d4447de8c0132dc14aa8fb4f7cda","abstract_canon_sha256":"b9245615822022602c00e2fb1fc484c23af46e172d2798dd37e3509c7c604e23"},"schema_version":"1.0"},"canonical_sha256":"6162249bd77dbaafc618307b5ec91e20ad9e1c3b0496e71903014126ce592eea","source":{"kind":"arxiv","id":"1309.0037","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1309.0037","created_at":"2026-05-18T01:47:51Z"},{"alias_kind":"arxiv_version","alias_value":"1309.0037v1","created_at":"2026-05-18T01:47:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1309.0037","created_at":"2026-05-18T01:47:51Z"},{"alias_kind":"pith_short_12","alias_value":"MFRCJG6XPW5K","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"MFRCJG6XPW5K7RQY","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"MFRCJG6X","created_at":"2026-05-18T12:27:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:MFRCJG6XPW5K7RQYGB5V5SI6EC","target":"record","payload":{"canonical_record":{"source":{"id":"1309.0037","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-08-30T21:51:52Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"6301f0d47303c71e0b50a9ba2d6210fdcf65d4447de8c0132dc14aa8fb4f7cda","abstract_canon_sha256":"b9245615822022602c00e2fb1fc484c23af46e172d2798dd37e3509c7c604e23"},"schema_version":"1.0"},"canonical_sha256":"6162249bd77dbaafc618307b5ec91e20ad9e1c3b0496e71903014126ce592eea","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:47:51.087823Z","signature_b64":"MI5nc75e/tbOUKLYLivEROPvxVk/IHR2pEOitMebilOKbPt8rS/thFT+yMGqQLcDX9t4XirXpeiFHBAYy6HlDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6162249bd77dbaafc618307b5ec91e20ad9e1c3b0496e71903014126ce592eea","last_reissued_at":"2026-05-18T01:47:51.087381Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:47:51.087381Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1309.0037","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:47:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Dk1kIycpSStD8wrvmuu5HeOdpFwlJ/3Dpx3PlQtuaBZCmFSX/CbsM5j4ebQYOkU83KKM5ZxHQWSkOvNXPgW1AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T16:57:16.671542Z"},"content_sha256":"a281f7c2d6278767a86be6e6e350095977998460b09b43dbf81ebafcc20f4c39","schema_version":"1.0","event_id":"sha256:a281f7c2d6278767a86be6e6e350095977998460b09b43dbf81ebafcc20f4c39"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:MFRCJG6XPW5K7RQYGB5V5SI6EC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Observational nuclear astrophysics: neutron-capture element abundances in old, metal-poor stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"Anna Frebel, Heather R. Jacobson","submitted_at":"2013-08-30T21:51:52Z","abstract_excerpt":"The chemical abundances of metal-poor stars provide a great deal of information regarding the individual nucleosynthetic processes that created the observed elements and the overall process of chemical enrichment of the galaxy since the formation of the first stars. Here we review the abundance patterns of the neutron-capture elements (Z > 38) in those metal-poor stars and our current understanding of the conditions and sites of their production at early times. We also review the relative contributions of these different processes to the build-up of these elements within the galaxy over time, "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1309.0037","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:47:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qSbLNOZogcmkBAnLh2fksKA3tQxHbhiWIr6DgY4MdBGeD2BcPIsTQQvGRFzJ9KAbZ5bcAzyY2T6kCdcsT4xaAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T16:57:16.672234Z"},"content_sha256":"74067d62c8cc7aeb6c83db2ca48afa121ae4e21140d70da8d5a50169e1203550","schema_version":"1.0","event_id":"sha256:74067d62c8cc7aeb6c83db2ca48afa121ae4e21140d70da8d5a50169e1203550"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MFRCJG6XPW5K7RQYGB5V5SI6EC/bundle.json","state_url":"https://pith.science/pith/MFRCJG6XPW5K7RQYGB5V5SI6EC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MFRCJG6XPW5K7RQYGB5V5SI6EC/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-09T16:57:16Z","links":{"resolver":"https://pith.science/pith/MFRCJG6XPW5K7RQYGB5V5SI6EC","bundle":"https://pith.science/pith/MFRCJG6XPW5K7RQYGB5V5SI6EC/bundle.json","state":"https://pith.science/pith/MFRCJG6XPW5K7RQYGB5V5SI6EC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MFRCJG6XPW5K7RQYGB5V5SI6EC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:MFRCJG6XPW5K7RQYGB5V5SI6EC","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":"b9245615822022602c00e2fb1fc484c23af46e172d2798dd37e3509c7c604e23","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-08-30T21:51:52Z","title_canon_sha256":"6301f0d47303c71e0b50a9ba2d6210fdcf65d4447de8c0132dc14aa8fb4f7cda"},"schema_version":"1.0","source":{"id":"1309.0037","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1309.0037","created_at":"2026-05-18T01:47:51Z"},{"alias_kind":"arxiv_version","alias_value":"1309.0037v1","created_at":"2026-05-18T01:47:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1309.0037","created_at":"2026-05-18T01:47:51Z"},{"alias_kind":"pith_short_12","alias_value":"MFRCJG6XPW5K","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"MFRCJG6XPW5K7RQY","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"MFRCJG6X","created_at":"2026-05-18T12:27:52Z"}],"graph_snapshots":[{"event_id":"sha256:74067d62c8cc7aeb6c83db2ca48afa121ae4e21140d70da8d5a50169e1203550","target":"graph","created_at":"2026-05-18T01:47:51Z","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 chemical abundances of metal-poor stars provide a great deal of information regarding the individual nucleosynthetic processes that created the observed elements and the overall process of chemical enrichment of the galaxy since the formation of the first stars. Here we review the abundance patterns of the neutron-capture elements (Z > 38) in those metal-poor stars and our current understanding of the conditions and sites of their production at early times. We also review the relative contributions of these different processes to the build-up of these elements within the galaxy over time, ","authors_text":"Anna Frebel, Heather R. Jacobson","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-08-30T21:51:52Z","title":"Observational nuclear astrophysics: neutron-capture element abundances in old, metal-poor stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1309.0037","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:a281f7c2d6278767a86be6e6e350095977998460b09b43dbf81ebafcc20f4c39","target":"record","created_at":"2026-05-18T01:47:51Z","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":"b9245615822022602c00e2fb1fc484c23af46e172d2798dd37e3509c7c604e23","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-08-30T21:51:52Z","title_canon_sha256":"6301f0d47303c71e0b50a9ba2d6210fdcf65d4447de8c0132dc14aa8fb4f7cda"},"schema_version":"1.0","source":{"id":"1309.0037","kind":"arxiv","version":1}},"canonical_sha256":"6162249bd77dbaafc618307b5ec91e20ad9e1c3b0496e71903014126ce592eea","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6162249bd77dbaafc618307b5ec91e20ad9e1c3b0496e71903014126ce592eea","first_computed_at":"2026-05-18T01:47:51.087381Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:47:51.087381Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MI5nc75e/tbOUKLYLivEROPvxVk/IHR2pEOitMebilOKbPt8rS/thFT+yMGqQLcDX9t4XirXpeiFHBAYy6HlDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:47:51.087823Z","signed_message":"canonical_sha256_bytes"},"source_id":"1309.0037","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a281f7c2d6278767a86be6e6e350095977998460b09b43dbf81ebafcc20f4c39","sha256:74067d62c8cc7aeb6c83db2ca48afa121ae4e21140d70da8d5a50169e1203550"],"state_sha256":"3e9886a38dce3900ada8647b71efee8edaafdf11aecc302c23a294c0024e8400"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Yf8NWyDfko14gm5Gr3Cai8qmY7Y+Z8iQWtgBQKd3HckTWTE7VFfCHy1C5oYeTmLLvtFZGz5vLS+6HrNl+BcuCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T16:57:16.676333Z","bundle_sha256":"908846537d0e6a483f5e62195e3eb0123b1fa925d5bd00cdae7a84bb375b57cc"}}