{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:4JRC76BUV7WQ7NJBAM3WZ5HFD5","short_pith_number":"pith:4JRC76BU","canonical_record":{"source":{"id":"1101.1940","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2011-01-10T20:13:32Z","cross_cats_sorted":["astro-ph.IM","astro-ph.SR","nucl-ex"],"title_canon_sha256":"ffa2c5f8a9e03239af173d14cf82b7f73f67b0780f9994a9004c56e7b09e7b8c","abstract_canon_sha256":"775be9ae08e6b5ab60ffde9e89503b1768c644e8be39ee03beeec38e192f374b"},"schema_version":"1.0"},"canonical_sha256":"e2622ff834afed0fb52103376cf4e51f5d72186bef8b1f8283f88e1e39e3908c","source":{"kind":"arxiv","id":"1101.1940","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1101.1940","created_at":"2026-05-18T04:31:51Z"},{"alias_kind":"arxiv_version","alias_value":"1101.1940v1","created_at":"2026-05-18T04:31:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.1940","created_at":"2026-05-18T04:31:51Z"},{"alias_kind":"pith_short_12","alias_value":"4JRC76BUV7WQ","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_16","alias_value":"4JRC76BUV7WQ7NJB","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_8","alias_value":"4JRC76BU","created_at":"2026-05-18T12:26:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:4JRC76BUV7WQ7NJBAM3WZ5HFD5","target":"record","payload":{"canonical_record":{"source":{"id":"1101.1940","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2011-01-10T20:13:32Z","cross_cats_sorted":["astro-ph.IM","astro-ph.SR","nucl-ex"],"title_canon_sha256":"ffa2c5f8a9e03239af173d14cf82b7f73f67b0780f9994a9004c56e7b09e7b8c","abstract_canon_sha256":"775be9ae08e6b5ab60ffde9e89503b1768c644e8be39ee03beeec38e192f374b"},"schema_version":"1.0"},"canonical_sha256":"e2622ff834afed0fb52103376cf4e51f5d72186bef8b1f8283f88e1e39e3908c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:31:51.372374Z","signature_b64":"hw06YCYN8rGo40lxP52WPKQWDRSZK7xe1sWPH5K6Uy3/I4MHlD2Zs8MrbxCxGnKwQDvskH/gBT6KuCuZ8NJyAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e2622ff834afed0fb52103376cf4e51f5d72186bef8b1f8283f88e1e39e3908c","last_reissued_at":"2026-05-18T04:31:51.371865Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:31:51.371865Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1101.1940","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":"2026-05-18T04:31:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"y6drpHDs8k6g5yDpI/8MqKsIjFKxSQW9XUkLWAaYRCBXtuep6L9XUBIXxzhyQoBTvWvCjQ9rNE6v0YCa6qYBBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T20:46:29.298440Z"},"content_sha256":"f022ca25297804a1d4fcba33ba4b644bbbe79d56aeb2cdd9e027076b65bf06da","schema_version":"1.0","event_id":"sha256:f022ca25297804a1d4fcba33ba4b644bbbe79d56aeb2cdd9e027076b65bf06da"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:4JRC76BUV7WQ7NJBAM3WZ5HFD5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An Optical Readout TPC (O-TPC) for Studies in Nuclear Astrophysics With Gamma-Ray Beams at HIgS","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM","astro-ph.SR","nucl-ex"],"primary_cat":"physics.ins-det","authors_text":"A. Breskin, A.H. Young (UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration), B. Bromberger, H.R. Weller, J.E.R. McDonald, K. Tittelmeier, M. Gai, M.W. Ahmed, P.-N. Seo, P.P. Martel, R. Chechik, R.H. France III, S.C. Stave, S.S. Henshaw, Th. Delbar, T.J. Kading, V. Dangendorf, W.R. Zimmerman","submitted_at":"2011-01-10T20:13:32Z","abstract_excerpt":"We report on the construction, tests, calibrations and commissioning of an Optical Readout Time Projection Chamber (O-TPC) detector operating with a CO2(80%) + N2(20%) gas mixture at 100 and 150 Torr. It was designed to measure the cross sections of several key nuclear reactions involved in stellar evolution. In particular, a study of the rate of formation of oxygen and carbon during the process of helium burning will be performed by exposing the chamber gas to intense nearly mono-energetic gamma-ray beams at the High Intensity Gamma Source (HIgS) facility. The O-TPC has a sensitive target-dri"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.1940","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":"2026-05-18T04:31:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"F+GD5MfMGfYpHdwhnb3ofnKQOfHBHNYCDrLN/u0dBZ4sGpXQO+oZZTkXobxs6SGiWae9NhgxDO0PbepCinJJDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T20:46:29.298795Z"},"content_sha256":"92ce9547791d64a0e79f47db464742881956fb027887cbe9446e4dd810de17ee","schema_version":"1.0","event_id":"sha256:92ce9547791d64a0e79f47db464742881956fb027887cbe9446e4dd810de17ee"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4JRC76BUV7WQ7NJBAM3WZ5HFD5/bundle.json","state_url":"https://pith.science/pith/4JRC76BUV7WQ7NJBAM3WZ5HFD5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4JRC76BUV7WQ7NJBAM3WZ5HFD5/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":"2026-05-19T20:46:29Z","links":{"resolver":"https://pith.science/pith/4JRC76BUV7WQ7NJBAM3WZ5HFD5","bundle":"https://pith.science/pith/4JRC76BUV7WQ7NJBAM3WZ5HFD5/bundle.json","state":"https://pith.science/pith/4JRC76BUV7WQ7NJBAM3WZ5HFD5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4JRC76BUV7WQ7NJBAM3WZ5HFD5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:4JRC76BUV7WQ7NJBAM3WZ5HFD5","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":"775be9ae08e6b5ab60ffde9e89503b1768c644e8be39ee03beeec38e192f374b","cross_cats_sorted":["astro-ph.IM","astro-ph.SR","nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2011-01-10T20:13:32Z","title_canon_sha256":"ffa2c5f8a9e03239af173d14cf82b7f73f67b0780f9994a9004c56e7b09e7b8c"},"schema_version":"1.0","source":{"id":"1101.1940","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1101.1940","created_at":"2026-05-18T04:31:51Z"},{"alias_kind":"arxiv_version","alias_value":"1101.1940v1","created_at":"2026-05-18T04:31:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.1940","created_at":"2026-05-18T04:31:51Z"},{"alias_kind":"pith_short_12","alias_value":"4JRC76BUV7WQ","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_16","alias_value":"4JRC76BUV7WQ7NJB","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_8","alias_value":"4JRC76BU","created_at":"2026-05-18T12:26:20Z"}],"graph_snapshots":[{"event_id":"sha256:92ce9547791d64a0e79f47db464742881956fb027887cbe9446e4dd810de17ee","target":"graph","created_at":"2026-05-18T04:31:51Z","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":"We report on the construction, tests, calibrations and commissioning of an Optical Readout Time Projection Chamber (O-TPC) detector operating with a CO2(80%) + N2(20%) gas mixture at 100 and 150 Torr. It was designed to measure the cross sections of several key nuclear reactions involved in stellar evolution. In particular, a study of the rate of formation of oxygen and carbon during the process of helium burning will be performed by exposing the chamber gas to intense nearly mono-energetic gamma-ray beams at the High Intensity Gamma Source (HIgS) facility. The O-TPC has a sensitive target-dri","authors_text":"A. Breskin, A.H. Young (UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration), B. Bromberger, H.R. Weller, J.E.R. McDonald, K. Tittelmeier, M. Gai, M.W. Ahmed, P.-N. Seo, P.P. Martel, R. Chechik, R.H. France III, S.C. Stave, S.S. Henshaw, Th. Delbar, T.J. Kading, V. Dangendorf, W.R. Zimmerman","cross_cats":["astro-ph.IM","astro-ph.SR","nucl-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2011-01-10T20:13:32Z","title":"An Optical Readout TPC (O-TPC) for Studies in Nuclear Astrophysics With Gamma-Ray Beams at HIgS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.1940","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:f022ca25297804a1d4fcba33ba4b644bbbe79d56aeb2cdd9e027076b65bf06da","target":"record","created_at":"2026-05-18T04:31:51Z","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":"775be9ae08e6b5ab60ffde9e89503b1768c644e8be39ee03beeec38e192f374b","cross_cats_sorted":["astro-ph.IM","astro-ph.SR","nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2011-01-10T20:13:32Z","title_canon_sha256":"ffa2c5f8a9e03239af173d14cf82b7f73f67b0780f9994a9004c56e7b09e7b8c"},"schema_version":"1.0","source":{"id":"1101.1940","kind":"arxiv","version":1}},"canonical_sha256":"e2622ff834afed0fb52103376cf4e51f5d72186bef8b1f8283f88e1e39e3908c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e2622ff834afed0fb52103376cf4e51f5d72186bef8b1f8283f88e1e39e3908c","first_computed_at":"2026-05-18T04:31:51.371865Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:31:51.371865Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hw06YCYN8rGo40lxP52WPKQWDRSZK7xe1sWPH5K6Uy3/I4MHlD2Zs8MrbxCxGnKwQDvskH/gBT6KuCuZ8NJyAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:31:51.372374Z","signed_message":"canonical_sha256_bytes"},"source_id":"1101.1940","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f022ca25297804a1d4fcba33ba4b644bbbe79d56aeb2cdd9e027076b65bf06da","sha256:92ce9547791d64a0e79f47db464742881956fb027887cbe9446e4dd810de17ee"],"state_sha256":"877a4ded3daaf746364ff547fe404178839718daf620c9979a2a488a51f63dcb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cVgi2KDeeSgwWOEn3Vzgx1hQCUJQQPMvTC2xfL0y2a2aRGHbrfeUpjrOTcp9S7RjEO+CXNXGFiYulAlz6y4MAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T20:46:29.301139Z","bundle_sha256":"8be15d8fb391d9bb2572adcd5dbff0303adbb9c8fd76bc9f9ba2c24f67a223b9"}}