{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:QE6PSJOZKOF5Y5ONWW52MZQ5EQ","short_pith_number":"pith:QE6PSJOZ","canonical_record":{"source":{"id":"1110.2242","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2011-10-11T01:09:43Z","cross_cats_sorted":["nucl-ex"],"title_canon_sha256":"7087e8eff87797b9430e4f36827d46b9842debd8c1fc185d9d515307e9c1793c","abstract_canon_sha256":"9b3fc4c7c80875e7ec96f41f6002de413d86fc426bc985e4210bf701f7a1e527"},"schema_version":"1.0"},"canonical_sha256":"813cf925d9538bdc75cdb5bba6661d240812cc4c01eaaaa0c00ce5e9c9336bc6","source":{"kind":"arxiv","id":"1110.2242","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1110.2242","created_at":"2026-05-18T04:10:08Z"},{"alias_kind":"arxiv_version","alias_value":"1110.2242v1","created_at":"2026-05-18T04:10:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1110.2242","created_at":"2026-05-18T04:10:08Z"},{"alias_kind":"pith_short_12","alias_value":"QE6PSJOZKOF5","created_at":"2026-05-18T12:26:39Z"},{"alias_kind":"pith_short_16","alias_value":"QE6PSJOZKOF5Y5ON","created_at":"2026-05-18T12:26:39Z"},{"alias_kind":"pith_short_8","alias_value":"QE6PSJOZ","created_at":"2026-05-18T12:26:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:QE6PSJOZKOF5Y5ONWW52MZQ5EQ","target":"record","payload":{"canonical_record":{"source":{"id":"1110.2242","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2011-10-11T01:09:43Z","cross_cats_sorted":["nucl-ex"],"title_canon_sha256":"7087e8eff87797b9430e4f36827d46b9842debd8c1fc185d9d515307e9c1793c","abstract_canon_sha256":"9b3fc4c7c80875e7ec96f41f6002de413d86fc426bc985e4210bf701f7a1e527"},"schema_version":"1.0"},"canonical_sha256":"813cf925d9538bdc75cdb5bba6661d240812cc4c01eaaaa0c00ce5e9c9336bc6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:10:08.387300Z","signature_b64":"jYVagRjUCTabao5WAuMtUeWybsZzXhC+f6jBeDWtTWbg1uh1k8GsymOnjE8gxW4gXPpFHZJHTWL8fJTLpthfAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"813cf925d9538bdc75cdb5bba6661d240812cc4c01eaaaa0c00ce5e9c9336bc6","last_reissued_at":"2026-05-18T04:10:08.386025Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:10:08.386025Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1110.2242","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":"2026-05-18T04:10:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KOZdrpJNSfmPEb8sneGOYDY7RNION5Cp4V4guKEkAa5EU9F9ljuxvLUdDsRKoZp/ZWdEcpvrSMvOgAFnNyP3Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T09:09:16.644902Z"},"content_sha256":"21e4b21e42e57d633ea3b0eb9c29806cfbd57fb540de783a5e5b32b96c014cb3","schema_version":"1.0","event_id":"sha256:21e4b21e42e57d633ea3b0eb9c29806cfbd57fb540de783a5e5b32b96c014cb3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:QE6PSJOZKOF5Y5ONWW52MZQ5EQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A direct probe of the in-medium pn scattering cross section","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex"],"primary_cat":"nucl-th","authors_text":"Gao-Chan Yong, Wei Zuo, Xun-Chao Zhang","submitted_at":"2011-10-11T01:09:43Z","abstract_excerpt":"Hard photon production from neutron-proton bremsstrahlung in intermediate energy heavy-ion reactions is examined as a probe of the in-medium pn scattering cross section within a transport model. Uncertainty of photon production probability pn-pngamma is cancelled out by using the ratio of hard photon spectra R_{12C+12C/p+n}(gamma) from two reactions. The in medium pn scattering cross section is constrained by using the ratio of hard photon production cross sections of proton-induced reactions p+12C and p+2H. A reduction factor sigma_pn^medium/sigma_pn^free of about 0.5 ~ 0.7 around saturation "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1110.2242","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":"2026-05-18T04:10:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EfgX03uFBZIMKogVr0mL2knRRfEKPFR8gvJiSBZvtUb/4quEVWhUsCSkGAgUzUPBX0THnPvbZjYH3HgzQF3uBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T09:09:16.645575Z"},"content_sha256":"ef501d2772eb7eb325f37a1e787053b131916ae88e5d0c6ad11fc7d71cd2dd36","schema_version":"1.0","event_id":"sha256:ef501d2772eb7eb325f37a1e787053b131916ae88e5d0c6ad11fc7d71cd2dd36"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QE6PSJOZKOF5Y5ONWW52MZQ5EQ/bundle.json","state_url":"https://pith.science/pith/QE6PSJOZKOF5Y5ONWW52MZQ5EQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QE6PSJOZKOF5Y5ONWW52MZQ5EQ/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":"2026-05-26T09:09:16Z","links":{"resolver":"https://pith.science/pith/QE6PSJOZKOF5Y5ONWW52MZQ5EQ","bundle":"https://pith.science/pith/QE6PSJOZKOF5Y5ONWW52MZQ5EQ/bundle.json","state":"https://pith.science/pith/QE6PSJOZKOF5Y5ONWW52MZQ5EQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QE6PSJOZKOF5Y5ONWW52MZQ5EQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:QE6PSJOZKOF5Y5ONWW52MZQ5EQ","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":"9b3fc4c7c80875e7ec96f41f6002de413d86fc426bc985e4210bf701f7a1e527","cross_cats_sorted":["nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2011-10-11T01:09:43Z","title_canon_sha256":"7087e8eff87797b9430e4f36827d46b9842debd8c1fc185d9d515307e9c1793c"},"schema_version":"1.0","source":{"id":"1110.2242","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1110.2242","created_at":"2026-05-18T04:10:08Z"},{"alias_kind":"arxiv_version","alias_value":"1110.2242v1","created_at":"2026-05-18T04:10:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1110.2242","created_at":"2026-05-18T04:10:08Z"},{"alias_kind":"pith_short_12","alias_value":"QE6PSJOZKOF5","created_at":"2026-05-18T12:26:39Z"},{"alias_kind":"pith_short_16","alias_value":"QE6PSJOZKOF5Y5ON","created_at":"2026-05-18T12:26:39Z"},{"alias_kind":"pith_short_8","alias_value":"QE6PSJOZ","created_at":"2026-05-18T12:26:39Z"}],"graph_snapshots":[{"event_id":"sha256:ef501d2772eb7eb325f37a1e787053b131916ae88e5d0c6ad11fc7d71cd2dd36","target":"graph","created_at":"2026-05-18T04:10:08Z","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":"Hard photon production from neutron-proton bremsstrahlung in intermediate energy heavy-ion reactions is examined as a probe of the in-medium pn scattering cross section within a transport model. Uncertainty of photon production probability pn-pngamma is cancelled out by using the ratio of hard photon spectra R_{12C+12C/p+n}(gamma) from two reactions. The in medium pn scattering cross section is constrained by using the ratio of hard photon production cross sections of proton-induced reactions p+12C and p+2H. A reduction factor sigma_pn^medium/sigma_pn^free of about 0.5 ~ 0.7 around saturation ","authors_text":"Gao-Chan Yong, Wei Zuo, Xun-Chao Zhang","cross_cats":["nucl-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2011-10-11T01:09:43Z","title":"A direct probe of the in-medium pn scattering cross section"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1110.2242","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":"sha256:21e4b21e42e57d633ea3b0eb9c29806cfbd57fb540de783a5e5b32b96c014cb3","target":"record","created_at":"2026-05-18T04:10:08Z","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":"9b3fc4c7c80875e7ec96f41f6002de413d86fc426bc985e4210bf701f7a1e527","cross_cats_sorted":["nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2011-10-11T01:09:43Z","title_canon_sha256":"7087e8eff87797b9430e4f36827d46b9842debd8c1fc185d9d515307e9c1793c"},"schema_version":"1.0","source":{"id":"1110.2242","kind":"arxiv","version":1}},"canonical_sha256":"813cf925d9538bdc75cdb5bba6661d240812cc4c01eaaaa0c00ce5e9c9336bc6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"813cf925d9538bdc75cdb5bba6661d240812cc4c01eaaaa0c00ce5e9c9336bc6","first_computed_at":"2026-05-18T04:10:08.386025Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:10:08.386025Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jYVagRjUCTabao5WAuMtUeWybsZzXhC+f6jBeDWtTWbg1uh1k8GsymOnjE8gxW4gXPpFHZJHTWL8fJTLpthfAg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:10:08.387300Z","signed_message":"canonical_sha256_bytes"},"source_id":"1110.2242","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:21e4b21e42e57d633ea3b0eb9c29806cfbd57fb540de783a5e5b32b96c014cb3","sha256:ef501d2772eb7eb325f37a1e787053b131916ae88e5d0c6ad11fc7d71cd2dd36"],"state_sha256":"0cb529d6bda5593f9ac884fa6dfe2e00efcecef30a2947e459ec6fe06c695947"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"g+VJdz2YPeNQfkdDb49zVWCEVFAKTw2wMuBUBTQBnOEpKDLEiHaYSHl7m3vrIFljjKQEW71wqk3qf8TrHYUkBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T09:09:16.649056Z","bundle_sha256":"75aa382541bb7dc6b317b815729c5858421d9af063a3661552abc1f442d24a13"}}