{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:JZ6TTCOZP77XMKUNBVCVOEYLKJ","short_pith_number":"pith:JZ6TTCOZ","canonical_record":{"source":{"id":"2211.09882","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2022-11-17T20:38:22Z","cross_cats_sorted":[],"title_canon_sha256":"b3a241ffe5b415a262b6567f2cfee239c07e471175d87d00913a3b5443cdd549","abstract_canon_sha256":"1e9ecf59fb81d39781ba94d0a4b9941e2eadcb8ad97ca047e4e90740be08fcd4"},"schema_version":"1.0"},"canonical_sha256":"4e7d3989d97fff762a8d0d4557130b5250b9619c74d5ebedc1404566fff2438a","source":{"kind":"arxiv","id":"2211.09882","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2211.09882","created_at":"2026-07-05T06:20:21Z"},{"alias_kind":"arxiv_version","alias_value":"2211.09882v1","created_at":"2026-07-05T06:20:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2211.09882","created_at":"2026-07-05T06:20:21Z"},{"alias_kind":"pith_short_12","alias_value":"JZ6TTCOZP77X","created_at":"2026-07-05T06:20:21Z"},{"alias_kind":"pith_short_16","alias_value":"JZ6TTCOZP77XMKUN","created_at":"2026-07-05T06:20:21Z"},{"alias_kind":"pith_short_8","alias_value":"JZ6TTCOZ","created_at":"2026-07-05T06:20:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:JZ6TTCOZP77XMKUNBVCVOEYLKJ","target":"record","payload":{"canonical_record":{"source":{"id":"2211.09882","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2022-11-17T20:38:22Z","cross_cats_sorted":[],"title_canon_sha256":"b3a241ffe5b415a262b6567f2cfee239c07e471175d87d00913a3b5443cdd549","abstract_canon_sha256":"1e9ecf59fb81d39781ba94d0a4b9941e2eadcb8ad97ca047e4e90740be08fcd4"},"schema_version":"1.0"},"canonical_sha256":"4e7d3989d97fff762a8d0d4557130b5250b9619c74d5ebedc1404566fff2438a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:20:21.736836Z","signature_b64":"10xUK2NozDmUdvQH0HLdc2TJMzy6aECefsQJQSuXU/wJmfQsZAn4HCfo9KFRfLJsSaKx3hGvDS55hZcbJEIiAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4e7d3989d97fff762a8d0d4557130b5250b9619c74d5ebedc1404566fff2438a","last_reissued_at":"2026-07-05T06:20:21.736298Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:20:21.736298Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2211.09882","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":"2026-07-05T06:20:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CJ5XyVrGmOyQv+BUt6umR0xOjyZjpDfGScj87xZOrKLJJkDFzCXZraEH2oYVYVndmdlWne0HaBEkU3+2LNgQCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T13:00:13.456748Z"},"content_sha256":"dcf5b20a356e17e88aaf9478b82561e6003bac95ac0083e5538fb881fb8db22e","schema_version":"1.0","event_id":"sha256:dcf5b20a356e17e88aaf9478b82561e6003bac95ac0083e5538fb881fb8db22e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:JZ6TTCOZP77XMKUNBVCVOEYLKJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Study on degradation of VUV-sensitivity of MPPC for liquid xenon scintillation detector by radiation damage in MEG II experiment","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ins-det","authors_text":"K. Ieki, K. Shimada, K. Toyoda, R. Onda, S. Kobayashi, S. Ogawa, T. Iwamoto, Toshinori Mori, W. Ootani","submitted_at":"2022-11-17T20:38:22Z","abstract_excerpt":"In the MEG II experiment, the liquid xenon gamma-ray detector uses Multi-Pixel Photon Counters (MPPC) which are sensitive to vacuum ultraviolet (VUV) light under a high-intensity muon beam environment. In the commissioning phase of the detector with the beam, a significant degradation in the photon detection efficiency (PDE) for VUV light was found, while the degradation in the PDE for visible light was much less significant. This implies that the radiation damage is localized to the surface of the MPPC where incoming VUV photons create electron-hole pairs. It was also found that the PDE can r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2211.09882","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/2211.09882/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":"2026-07-05T06:20:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Mdp8X1WxMRbC9GCGnhrLFkD2MZ5jHdAvt40nWhbCS5E10i68R9TI9QyfBpmd3UvWD8aAq1+OqDYRAWiSGM3yAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T13:00:13.457260Z"},"content_sha256":"e62365b03b644c88ed898cab53d2d1524b5a4f970a5d149bee40664f5105f4f4","schema_version":"1.0","event_id":"sha256:e62365b03b644c88ed898cab53d2d1524b5a4f970a5d149bee40664f5105f4f4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JZ6TTCOZP77XMKUNBVCVOEYLKJ/bundle.json","state_url":"https://pith.science/pith/JZ6TTCOZP77XMKUNBVCVOEYLKJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JZ6TTCOZP77XMKUNBVCVOEYLKJ/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":"2026-07-07T13:00:13Z","links":{"resolver":"https://pith.science/pith/JZ6TTCOZP77XMKUNBVCVOEYLKJ","bundle":"https://pith.science/pith/JZ6TTCOZP77XMKUNBVCVOEYLKJ/bundle.json","state":"https://pith.science/pith/JZ6TTCOZP77XMKUNBVCVOEYLKJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JZ6TTCOZP77XMKUNBVCVOEYLKJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:JZ6TTCOZP77XMKUNBVCVOEYLKJ","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":"1e9ecf59fb81d39781ba94d0a4b9941e2eadcb8ad97ca047e4e90740be08fcd4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2022-11-17T20:38:22Z","title_canon_sha256":"b3a241ffe5b415a262b6567f2cfee239c07e471175d87d00913a3b5443cdd549"},"schema_version":"1.0","source":{"id":"2211.09882","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2211.09882","created_at":"2026-07-05T06:20:21Z"},{"alias_kind":"arxiv_version","alias_value":"2211.09882v1","created_at":"2026-07-05T06:20:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2211.09882","created_at":"2026-07-05T06:20:21Z"},{"alias_kind":"pith_short_12","alias_value":"JZ6TTCOZP77X","created_at":"2026-07-05T06:20:21Z"},{"alias_kind":"pith_short_16","alias_value":"JZ6TTCOZP77XMKUN","created_at":"2026-07-05T06:20:21Z"},{"alias_kind":"pith_short_8","alias_value":"JZ6TTCOZ","created_at":"2026-07-05T06:20:21Z"}],"graph_snapshots":[{"event_id":"sha256:e62365b03b644c88ed898cab53d2d1524b5a4f970a5d149bee40664f5105f4f4","target":"graph","created_at":"2026-07-05T06:20:21Z","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/2211.09882/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In the MEG II experiment, the liquid xenon gamma-ray detector uses Multi-Pixel Photon Counters (MPPC) which are sensitive to vacuum ultraviolet (VUV) light under a high-intensity muon beam environment. In the commissioning phase of the detector with the beam, a significant degradation in the photon detection efficiency (PDE) for VUV light was found, while the degradation in the PDE for visible light was much less significant. This implies that the radiation damage is localized to the surface of the MPPC where incoming VUV photons create electron-hole pairs. It was also found that the PDE can r","authors_text":"K. Ieki, K. Shimada, K. Toyoda, R. Onda, S. Kobayashi, S. Ogawa, T. Iwamoto, Toshinori Mori, W. Ootani","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2022-11-17T20:38:22Z","title":"Study on degradation of VUV-sensitivity of MPPC for liquid xenon scintillation detector by radiation damage in MEG II experiment"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2211.09882","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:dcf5b20a356e17e88aaf9478b82561e6003bac95ac0083e5538fb881fb8db22e","target":"record","created_at":"2026-07-05T06:20:21Z","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":"1e9ecf59fb81d39781ba94d0a4b9941e2eadcb8ad97ca047e4e90740be08fcd4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2022-11-17T20:38:22Z","title_canon_sha256":"b3a241ffe5b415a262b6567f2cfee239c07e471175d87d00913a3b5443cdd549"},"schema_version":"1.0","source":{"id":"2211.09882","kind":"arxiv","version":1}},"canonical_sha256":"4e7d3989d97fff762a8d0d4557130b5250b9619c74d5ebedc1404566fff2438a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4e7d3989d97fff762a8d0d4557130b5250b9619c74d5ebedc1404566fff2438a","first_computed_at":"2026-07-05T06:20:21.736298Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:20:21.736298Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"10xUK2NozDmUdvQH0HLdc2TJMzy6aECefsQJQSuXU/wJmfQsZAn4HCfo9KFRfLJsSaKx3hGvDS55hZcbJEIiAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T06:20:21.736836Z","signed_message":"canonical_sha256_bytes"},"source_id":"2211.09882","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dcf5b20a356e17e88aaf9478b82561e6003bac95ac0083e5538fb881fb8db22e","sha256:e62365b03b644c88ed898cab53d2d1524b5a4f970a5d149bee40664f5105f4f4"],"state_sha256":"537793c5468d8a9a0aea815b9678f5aaca0bfd393f07b713c58da6431eff1374"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8+L3nW49wp7UMFqEDztAA4W7fuC6P0zADVLarGBVHZwbf/uSRc1ksuDAICRzTle6lrYX0ZVcpQ2PKWW9h4XbDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T13:00:13.460605Z","bundle_sha256":"8dc1530df79e5eea85d866faa137b4264ad09b65b05a531856c98ae3d1625a9a"}}