{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2005:HX5RZILSGJTS5OH42HU375CFSF","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":"d849c30b50f750b10895d771e4570189610f9b91eabcacfc16e6cbf96db98480","cross_cats_sorted":["physics.ed-ph"],"license":"","primary_cat":"physics.ins-det","submitted_at":"2005-02-19T23:00:09Z","title_canon_sha256":"8209b33b307091ad8cd98329281a46d10e04e4eab634ab0f3cd7761e711ccdae"},"schema_version":"1.0","source":{"id":"physics/0502103","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"physics/0502103","created_at":"2026-05-18T01:38:07Z"},{"alias_kind":"arxiv_version","alias_value":"physics/0502103v1","created_at":"2026-05-18T01:38:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.physics/0502103","created_at":"2026-05-18T01:38:07Z"},{"alias_kind":"pith_short_12","alias_value":"HX5RZILSGJTS","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_16","alias_value":"HX5RZILSGJTS5OH4","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_8","alias_value":"HX5RZILS","created_at":"2026-05-18T12:25:53Z"}],"graph_snapshots":[{"event_id":"sha256:4858fce7f7d17f3efc756dd9d85a0b8cbea19f726d0ee70e32570969250b46d9","target":"graph","created_at":"2026-05-18T01:38:07Z","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 describe a compact apparatus that automatically measures the charge averaged lifetime of atmospheric muons in plastic scintillator using low-cost, low-power electronics and that measures the stopping rate of atmospheric muons as a function of altitude to demonstrate relativistic time dilation. The apparatus is designed for the advanced undergraduate physics laboratory and is suitable for field measurements.","authors_text":"Jingbo Ye, Thomas Coan, Tiankuan Liu","cross_cats":["physics.ed-ph"],"headline":"","license":"","primary_cat":"physics.ins-det","submitted_at":"2005-02-19T23:00:09Z","title":"A Compact Apparatus for Muon Lifetime Measurement and Time Dilation Demonstration in the Undergraduate Laboratory"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"physics/0502103","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":"sha256:3492122c737f25bd0d063f91b07e9d26f151b0c6ebd8aeea744a686ef9fbebc9","target":"record","created_at":"2026-05-18T01:38:07Z","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":"d849c30b50f750b10895d771e4570189610f9b91eabcacfc16e6cbf96db98480","cross_cats_sorted":["physics.ed-ph"],"license":"","primary_cat":"physics.ins-det","submitted_at":"2005-02-19T23:00:09Z","title_canon_sha256":"8209b33b307091ad8cd98329281a46d10e04e4eab634ab0f3cd7761e711ccdae"},"schema_version":"1.0","source":{"id":"physics/0502103","kind":"arxiv","version":1}},"canonical_sha256":"3dfb1ca17232672eb8fcd1e9bff445917a1b9f746cf729a2fdf540cda5ce3bd2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3dfb1ca17232672eb8fcd1e9bff445917a1b9f746cf729a2fdf540cda5ce3bd2","first_computed_at":"2026-05-18T01:38:07.885389Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:38:07.885389Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Upb4bUwchpRTlJlXNLPC/cUVVdJkOH97ymzeJkLj1uxvGq95rXZ60l9RPZzAYH0V5/gCZQyUWkESmFkJeJHtBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:38:07.886052Z","signed_message":"canonical_sha256_bytes"},"source_id":"physics/0502103","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3492122c737f25bd0d063f91b07e9d26f151b0c6ebd8aeea744a686ef9fbebc9","sha256:4858fce7f7d17f3efc756dd9d85a0b8cbea19f726d0ee70e32570969250b46d9"],"state_sha256":"aba6083073a72925fdb72574a7d9f17eb784a19d0f0fde72857780dcef02ed83"}