{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:X322QCAK4J6Y2HRYGELBMY2OWA","short_pith_number":"pith:X322QCAK","canonical_record":{"source":{"id":"1701.03848","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-01-13T23:11:39Z","cross_cats_sorted":["physics.data-an"],"title_canon_sha256":"79af86f65fe5ac3dac8759ff9a4db59f8bdcb237b40b4b0fd2dbf5d7831aedae","abstract_canon_sha256":"930c455e962282194bf2492abc41f9c6e89c727ce5c1b66d3757f1d30a55fa16"},"schema_version":"1.0"},"canonical_sha256":"bef5a8080ae27d8d1e38311616634eb035d938c6642a2a06f0e4dd8dce93fa72","source":{"kind":"arxiv","id":"1701.03848","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.03848","created_at":"2026-05-18T00:52:22Z"},{"alias_kind":"arxiv_version","alias_value":"1701.03848v1","created_at":"2026-05-18T00:52:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.03848","created_at":"2026-05-18T00:52:22Z"},{"alias_kind":"pith_short_12","alias_value":"X322QCAK4J6Y","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_16","alias_value":"X322QCAK4J6Y2HRY","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_8","alias_value":"X322QCAK","created_at":"2026-05-18T12:31:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:X322QCAK4J6Y2HRYGELBMY2OWA","target":"record","payload":{"canonical_record":{"source":{"id":"1701.03848","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-01-13T23:11:39Z","cross_cats_sorted":["physics.data-an"],"title_canon_sha256":"79af86f65fe5ac3dac8759ff9a4db59f8bdcb237b40b4b0fd2dbf5d7831aedae","abstract_canon_sha256":"930c455e962282194bf2492abc41f9c6e89c727ce5c1b66d3757f1d30a55fa16"},"schema_version":"1.0"},"canonical_sha256":"bef5a8080ae27d8d1e38311616634eb035d938c6642a2a06f0e4dd8dce93fa72","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:52:22.211935Z","signature_b64":"+nIX8L18ZycGuXFvSk2tZx1RA3lji5dtxN2Nf1BVO6/NnR9G0h1aea7NvxgoaZrWwubw/wWM+OoJYJXt7C1OCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bef5a8080ae27d8d1e38311616634eb035d938c6642a2a06f0e4dd8dce93fa72","last_reissued_at":"2026-05-18T00:52:22.211211Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:52:22.211211Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1701.03848","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":"2026-05-18T00:52:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"W9221DnoINZHN3rM/vlWjDE9NrrlcLIA74k2XG//etJRznmR9I6H8agKG84HBkTHwpboNu3/fzqcmZKwP5nCBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T18:40:24.955458Z"},"content_sha256":"5b834a5171669bc2b9579d0234bf3bdaf32fea901e05e6a7242e4030f27655fa","schema_version":"1.0","event_id":"sha256:5b834a5171669bc2b9579d0234bf3bdaf32fea901e05e6a7242e4030f27655fa"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:X322QCAK4J6Y2HRYGELBMY2OWA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Multiplication and Presence of Shielding Material from Time-Correlated Pulse-Height Measurements of Subcritical Plutonium Assemblies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.data-an"],"primary_cat":"physics.ins-det","authors_text":"Marc Paff, Mateusz Monterial, Peter Marleau, Sara Pozzi, Shaun Clarke","submitted_at":"2017-01-13T23:11:39Z","abstract_excerpt":"We present the results from the first measurements of the Time-Correlated Pulse-Height (TCPH) distributions from 4.5 kg sphere of $\\alpha$-phase weapons-grade plutonium metal in five configurations: bare, reflected by 1.27 cm and 2.54 cm of tungsten, and 2.54 cm and 7.62 cm of polyethylene. A new method for characterizing source multiplication and shielding configuration is also demonstrated. The method relies on solving for the underlying fission chain timing distribution that drives the spreading of the measured TCPH distribution. We found that a gamma distribution fits the fission chain tim"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.03848","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":"2026-05-18T00:52:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pHm91tXKzrZ6mJC6/ypuV5+8Pa4djdr0KphSSJyx9QbdL7nt0281A+nbggF2PtBmCL309cvWRk9aG5TrmnoiAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T18:40:24.955823Z"},"content_sha256":"ea9829bf8fa91295708cd917b7fbab700c9c131d75070fc884b3ab8a0b156800","schema_version":"1.0","event_id":"sha256:ea9829bf8fa91295708cd917b7fbab700c9c131d75070fc884b3ab8a0b156800"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/X322QCAK4J6Y2HRYGELBMY2OWA/bundle.json","state_url":"https://pith.science/pith/X322QCAK4J6Y2HRYGELBMY2OWA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/X322QCAK4J6Y2HRYGELBMY2OWA/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":"2026-06-20T18:40:24Z","links":{"resolver":"https://pith.science/pith/X322QCAK4J6Y2HRYGELBMY2OWA","bundle":"https://pith.science/pith/X322QCAK4J6Y2HRYGELBMY2OWA/bundle.json","state":"https://pith.science/pith/X322QCAK4J6Y2HRYGELBMY2OWA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/X322QCAK4J6Y2HRYGELBMY2OWA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:X322QCAK4J6Y2HRYGELBMY2OWA","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":"930c455e962282194bf2492abc41f9c6e89c727ce5c1b66d3757f1d30a55fa16","cross_cats_sorted":["physics.data-an"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-01-13T23:11:39Z","title_canon_sha256":"79af86f65fe5ac3dac8759ff9a4db59f8bdcb237b40b4b0fd2dbf5d7831aedae"},"schema_version":"1.0","source":{"id":"1701.03848","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1701.03848","created_at":"2026-05-18T00:52:22Z"},{"alias_kind":"arxiv_version","alias_value":"1701.03848v1","created_at":"2026-05-18T00:52:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1701.03848","created_at":"2026-05-18T00:52:22Z"},{"alias_kind":"pith_short_12","alias_value":"X322QCAK4J6Y","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_16","alias_value":"X322QCAK4J6Y2HRY","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_8","alias_value":"X322QCAK","created_at":"2026-05-18T12:31:53Z"}],"graph_snapshots":[{"event_id":"sha256:ea9829bf8fa91295708cd917b7fbab700c9c131d75070fc884b3ab8a0b156800","target":"graph","created_at":"2026-05-18T00:52:22Z","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 present the results from the first measurements of the Time-Correlated Pulse-Height (TCPH) distributions from 4.5 kg sphere of $\\alpha$-phase weapons-grade plutonium metal in five configurations: bare, reflected by 1.27 cm and 2.54 cm of tungsten, and 2.54 cm and 7.62 cm of polyethylene. A new method for characterizing source multiplication and shielding configuration is also demonstrated. The method relies on solving for the underlying fission chain timing distribution that drives the spreading of the measured TCPH distribution. We found that a gamma distribution fits the fission chain tim","authors_text":"Marc Paff, Mateusz Monterial, Peter Marleau, Sara Pozzi, Shaun Clarke","cross_cats":["physics.data-an"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-01-13T23:11:39Z","title":"Multiplication and Presence of Shielding Material from Time-Correlated Pulse-Height Measurements of Subcritical Plutonium Assemblies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1701.03848","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":"sha256:5b834a5171669bc2b9579d0234bf3bdaf32fea901e05e6a7242e4030f27655fa","target":"record","created_at":"2026-05-18T00:52:22Z","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":"930c455e962282194bf2492abc41f9c6e89c727ce5c1b66d3757f1d30a55fa16","cross_cats_sorted":["physics.data-an"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-01-13T23:11:39Z","title_canon_sha256":"79af86f65fe5ac3dac8759ff9a4db59f8bdcb237b40b4b0fd2dbf5d7831aedae"},"schema_version":"1.0","source":{"id":"1701.03848","kind":"arxiv","version":1}},"canonical_sha256":"bef5a8080ae27d8d1e38311616634eb035d938c6642a2a06f0e4dd8dce93fa72","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bef5a8080ae27d8d1e38311616634eb035d938c6642a2a06f0e4dd8dce93fa72","first_computed_at":"2026-05-18T00:52:22.211211Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:52:22.211211Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+nIX8L18ZycGuXFvSk2tZx1RA3lji5dtxN2Nf1BVO6/NnR9G0h1aea7NvxgoaZrWwubw/wWM+OoJYJXt7C1OCg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:52:22.211935Z","signed_message":"canonical_sha256_bytes"},"source_id":"1701.03848","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5b834a5171669bc2b9579d0234bf3bdaf32fea901e05e6a7242e4030f27655fa","sha256:ea9829bf8fa91295708cd917b7fbab700c9c131d75070fc884b3ab8a0b156800"],"state_sha256":"526e4910e0e84f477a3ea92d9a8db0b776f7ec98cdbcfd086d787faa1275ec03"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"D3oMNnnhIX30G9iFcoke5LJHy9vu2IkpjG4j+U2XFfWB8ZlMI5t8bul8Eb+y8/kLB1jG1grkoIUmKp4/SVEXBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-20T18:40:24.957714Z","bundle_sha256":"08cdf44427934954169628fa9eaa09b8b340e071ca8e3992488ab772401ff08d"}}