{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:NJHJ4C2AT3JHR2C2YOSKNUTVF3","short_pith_number":"pith:NJHJ4C2A","canonical_record":{"source":{"id":"1907.02327","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-07-04T11:06:19Z","cross_cats_sorted":["nucl-ex"],"title_canon_sha256":"c2704e93623c95314d6e161e1392a9af3c9dd47f20a7b323b313c5b552ab0e31","abstract_canon_sha256":"83e7094a702e79b74b500e3d46f6f5ea2fa4a04e4e2f9ea269f6e85e6c14f31b"},"schema_version":"1.0"},"canonical_sha256":"6a4e9e0b409ed278e85ac3a4a6d2752edae151e3d8bb19626c38b31c032245d4","source":{"kind":"arxiv","id":"1907.02327","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.02327","created_at":"2026-07-05T00:01:58Z"},{"alias_kind":"arxiv_version","alias_value":"1907.02327v1","created_at":"2026-07-05T00:01:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.02327","created_at":"2026-07-05T00:01:58Z"},{"alias_kind":"pith_short_12","alias_value":"NJHJ4C2AT3JH","created_at":"2026-07-05T00:01:58Z"},{"alias_kind":"pith_short_16","alias_value":"NJHJ4C2AT3JHR2C2","created_at":"2026-07-05T00:01:58Z"},{"alias_kind":"pith_short_8","alias_value":"NJHJ4C2A","created_at":"2026-07-05T00:01:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:NJHJ4C2AT3JHR2C2YOSKNUTVF3","target":"record","payload":{"canonical_record":{"source":{"id":"1907.02327","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-07-04T11:06:19Z","cross_cats_sorted":["nucl-ex"],"title_canon_sha256":"c2704e93623c95314d6e161e1392a9af3c9dd47f20a7b323b313c5b552ab0e31","abstract_canon_sha256":"83e7094a702e79b74b500e3d46f6f5ea2fa4a04e4e2f9ea269f6e85e6c14f31b"},"schema_version":"1.0"},"canonical_sha256":"6a4e9e0b409ed278e85ac3a4a6d2752edae151e3d8bb19626c38b31c032245d4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:01:58.159111Z","signature_b64":"fLr3wHitbDKOtvBj91WJ9Bhvx9QMUUVL7DvKghcD1ylVgxRIpVXqo7qCgmUJPMhRtJ+Nh6TWdI2e2dBcCj1IBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6a4e9e0b409ed278e85ac3a4a6d2752edae151e3d8bb19626c38b31c032245d4","last_reissued_at":"2026-07-05T00:01:58.158726Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:01:58.158726Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.02327","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":"2026-07-05T00:01:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZCL0wk7fmUzY6tjXxW1KKOMZ/t/Lkh/gaqnDaXpPEvWytc8/HtA8sr6ZFTV3fFc0nFVTRw7yonsw4i4tZfnOAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T11:41:32.311532Z"},"content_sha256":"b8ca510da2bcc5f08e8aeff156c4211061a843c138bc2a8c75fee90ba42c50b9","schema_version":"1.0","event_id":"sha256:b8ca510da2bcc5f08e8aeff156c4211061a843c138bc2a8c75fee90ba42c50b9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:NJHJ4C2AT3JHR2C2YOSKNUTVF3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A study in using MICROMEGAS to improve particle identification with the TAMU-MDM focal plane detector","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex"],"primary_cat":"physics.ins-det","authors_text":"Alexandra Spiridon, Antti Saastamoinen, Bertrand Mehl, Emmanuel Pollacco, George Pascovici, Livius Trache, Robert E. Tribble, Rui de Oliveira","submitted_at":"2019-07-04T11:06:19Z","abstract_excerpt":"A MICROMEGAS detection amplifier has been incorporated into the design of the TAMU MDM focal plane detector with the purpose of improving the energy resolution and thus, the particle identification. Beam tests showed a factor of 2 improvement over the original design, from 10-12% to 4-6%, for ions with A<40 at E/A around 10-20 MeV."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.02327","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1907.02327/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:01:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"73JcWCzSIfWnA8VvM9YO5khfy2Lxc7W6EeAAatwa3ZXjVQxRcBM3zAfXBNh4SIbEQLh6PmW9SaXe6oWKgYDLBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T11:41:32.311897Z"},"content_sha256":"749bb674b8bf0c9649dc76aca7c7d9eb5f52311b7a4d6e54a725c56213572d65","schema_version":"1.0","event_id":"sha256:749bb674b8bf0c9649dc76aca7c7d9eb5f52311b7a4d6e54a725c56213572d65"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NJHJ4C2AT3JHR2C2YOSKNUTVF3/bundle.json","state_url":"https://pith.science/pith/NJHJ4C2AT3JHR2C2YOSKNUTVF3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NJHJ4C2AT3JHR2C2YOSKNUTVF3/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":"2026-07-07T11:41:32Z","links":{"resolver":"https://pith.science/pith/NJHJ4C2AT3JHR2C2YOSKNUTVF3","bundle":"https://pith.science/pith/NJHJ4C2AT3JHR2C2YOSKNUTVF3/bundle.json","state":"https://pith.science/pith/NJHJ4C2AT3JHR2C2YOSKNUTVF3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NJHJ4C2AT3JHR2C2YOSKNUTVF3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:NJHJ4C2AT3JHR2C2YOSKNUTVF3","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":"83e7094a702e79b74b500e3d46f6f5ea2fa4a04e4e2f9ea269f6e85e6c14f31b","cross_cats_sorted":["nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-07-04T11:06:19Z","title_canon_sha256":"c2704e93623c95314d6e161e1392a9af3c9dd47f20a7b323b313c5b552ab0e31"},"schema_version":"1.0","source":{"id":"1907.02327","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.02327","created_at":"2026-07-05T00:01:58Z"},{"alias_kind":"arxiv_version","alias_value":"1907.02327v1","created_at":"2026-07-05T00:01:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.02327","created_at":"2026-07-05T00:01:58Z"},{"alias_kind":"pith_short_12","alias_value":"NJHJ4C2AT3JH","created_at":"2026-07-05T00:01:58Z"},{"alias_kind":"pith_short_16","alias_value":"NJHJ4C2AT3JHR2C2","created_at":"2026-07-05T00:01:58Z"},{"alias_kind":"pith_short_8","alias_value":"NJHJ4C2A","created_at":"2026-07-05T00:01:58Z"}],"graph_snapshots":[{"event_id":"sha256:749bb674b8bf0c9649dc76aca7c7d9eb5f52311b7a4d6e54a725c56213572d65","target":"graph","created_at":"2026-07-05T00:01:58Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1907.02327/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A MICROMEGAS detection amplifier has been incorporated into the design of the TAMU MDM focal plane detector with the purpose of improving the energy resolution and thus, the particle identification. Beam tests showed a factor of 2 improvement over the original design, from 10-12% to 4-6%, for ions with A<40 at E/A around 10-20 MeV.","authors_text":"Alexandra Spiridon, Antti Saastamoinen, Bertrand Mehl, Emmanuel Pollacco, George Pascovici, Livius Trache, Robert E. Tribble, Rui de Oliveira","cross_cats":["nucl-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-07-04T11:06:19Z","title":"A study in using MICROMEGAS to improve particle identification with the TAMU-MDM focal plane detector"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.02327","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:b8ca510da2bcc5f08e8aeff156c4211061a843c138bc2a8c75fee90ba42c50b9","target":"record","created_at":"2026-07-05T00:01:58Z","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":"83e7094a702e79b74b500e3d46f6f5ea2fa4a04e4e2f9ea269f6e85e6c14f31b","cross_cats_sorted":["nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2019-07-04T11:06:19Z","title_canon_sha256":"c2704e93623c95314d6e161e1392a9af3c9dd47f20a7b323b313c5b552ab0e31"},"schema_version":"1.0","source":{"id":"1907.02327","kind":"arxiv","version":1}},"canonical_sha256":"6a4e9e0b409ed278e85ac3a4a6d2752edae151e3d8bb19626c38b31c032245d4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6a4e9e0b409ed278e85ac3a4a6d2752edae151e3d8bb19626c38b31c032245d4","first_computed_at":"2026-07-05T00:01:58.158726Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:01:58.158726Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fLr3wHitbDKOtvBj91WJ9Bhvx9QMUUVL7DvKghcD1ylVgxRIpVXqo7qCgmUJPMhRtJ+Nh6TWdI2e2dBcCj1IBg==","signature_status":"signed_v1","signed_at":"2026-07-05T00:01:58.159111Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.02327","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b8ca510da2bcc5f08e8aeff156c4211061a843c138bc2a8c75fee90ba42c50b9","sha256:749bb674b8bf0c9649dc76aca7c7d9eb5f52311b7a4d6e54a725c56213572d65"],"state_sha256":"6c1cbb2300e5f3e17b52534606152c591082935a97301d9d8071af9824d6ea88"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"n+lb6c6/oy4aqJWq8HObbTWuKEoFGTXVCdK6vHm7nLMec3XPlEbA3MX9rVQ0R8R7kON1cKZl+QenbJ4DKcm0AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T11:41:32.313933Z","bundle_sha256":"4778e07a55688234c9621657fc69840c4382f0a8f09c1b44a845196eea0edfcc"}}