{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:QQS5IZVZJRVJL7VC4KIDWLGX2M","short_pith_number":"pith:QQS5IZVZ","canonical_record":{"source":{"id":"2308.00241","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.atom-ph","submitted_at":"2023-08-01T02:48:33Z","cross_cats_sorted":[],"title_canon_sha256":"87ae8908a6258e4f78979c6eb54186375e0037dbe51be3531de81e5ee3d9b74e","abstract_canon_sha256":"7e185aa159b9a75fcfe73a0924342a9fd4975173ab2e2fb0a0718b65c95e574a"},"schema_version":"1.0"},"canonical_sha256":"8425d466b94c6a95fea2e2903b2cd7d33663314dd8cd00ca2d689256166f41d2","source":{"kind":"arxiv","id":"2308.00241","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2308.00241","created_at":"2026-07-05T07:25:43Z"},{"alias_kind":"arxiv_version","alias_value":"2308.00241v2","created_at":"2026-07-05T07:25:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2308.00241","created_at":"2026-07-05T07:25:43Z"},{"alias_kind":"pith_short_12","alias_value":"QQS5IZVZJRVJ","created_at":"2026-07-05T07:25:43Z"},{"alias_kind":"pith_short_16","alias_value":"QQS5IZVZJRVJL7VC","created_at":"2026-07-05T07:25:43Z"},{"alias_kind":"pith_short_8","alias_value":"QQS5IZVZ","created_at":"2026-07-05T07:25:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:QQS5IZVZJRVJL7VC4KIDWLGX2M","target":"record","payload":{"canonical_record":{"source":{"id":"2308.00241","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.atom-ph","submitted_at":"2023-08-01T02:48:33Z","cross_cats_sorted":[],"title_canon_sha256":"87ae8908a6258e4f78979c6eb54186375e0037dbe51be3531de81e5ee3d9b74e","abstract_canon_sha256":"7e185aa159b9a75fcfe73a0924342a9fd4975173ab2e2fb0a0718b65c95e574a"},"schema_version":"1.0"},"canonical_sha256":"8425d466b94c6a95fea2e2903b2cd7d33663314dd8cd00ca2d689256166f41d2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:25:43.475362Z","signature_b64":"MwB/N81OajbHslZSpUMZ2KgEb31AEWZSDXIXVrG0IoDlb0jHLsU+HBmp9rtklvT7KH2pK59icF0FioNvOucUDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8425d466b94c6a95fea2e2903b2cd7d33663314dd8cd00ca2d689256166f41d2","last_reissued_at":"2026-07-05T07:25:43.474968Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:25:43.474968Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2308.00241","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:25:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eyCxnKg/qlsOHhV815sGX+AYIRtGJ7x/G/j2DsLTmyMBXfqMzucEyCe2NLTMScaFwy+cTPZB0tGs6ecQpQWSDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T18:47:12.899814Z"},"content_sha256":"865889bbf69a497e3fb3dbdc8fef85f0ed866afa3f284c65e008e58fa0ab56fb","schema_version":"1.0","event_id":"sha256:865889bbf69a497e3fb3dbdc8fef85f0ed866afa3f284c65e008e58fa0ab56fb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:QQS5IZVZJRVJL7VC4KIDWLGX2M","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Laser cooling and trapping of $^{224}$Ra$^+$","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"A. M. Jayich, A. N. Gaiser, C. A. Holliman, H. Li, J. R. Griswold, M. Fan, M. S. Ladabaum, R. Kwapisz, Roy A. Ready, S. Kofford","submitted_at":"2023-08-01T02:48:33Z","abstract_excerpt":"We report laser cooling and trapping of $^{224}$Ra$^+$ ions. This was realized via two-step photoionization loading of radium into an ion trap. A robust source for $^{224}$Ra atoms, which have a 3.6-day half-life, was realized with an effusive oven containing $^{228}$Th, which has a 1.9-yr half-life, which continuously generates $^{224}$Ra via its $\\alpha$-decay. We characterized the efficacy of this source and found that after depleting built-up radium the thorium decay provides a continuous source of radium atoms suitable for ion trapping. The vacuum system has been sealed for more than 6 mo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2308.00241","kind":"arxiv","version":2},"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/2308.00241/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":"2026-07-05T07:25:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8h+TjzFIacTp9nusgLFePPHTvRbZxyQ+La7zPFN7rWIeHq9nWDjYRopg3EwHLFCr6AIA62dIxptGdDyMzQaeDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T18:47:12.900691Z"},"content_sha256":"e0e3f1c82596d258e65ca2c35d05f0ef07b9bf7f2f46f425d4c4224f4cc25dbc","schema_version":"1.0","event_id":"sha256:e0e3f1c82596d258e65ca2c35d05f0ef07b9bf7f2f46f425d4c4224f4cc25dbc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QQS5IZVZJRVJL7VC4KIDWLGX2M/bundle.json","state_url":"https://pith.science/pith/QQS5IZVZJRVJL7VC4KIDWLGX2M/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QQS5IZVZJRVJL7VC4KIDWLGX2M/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":"2026-08-22T18:47:12Z","links":{"resolver":"https://pith.science/pith/QQS5IZVZJRVJL7VC4KIDWLGX2M","bundle":"https://pith.science/pith/QQS5IZVZJRVJL7VC4KIDWLGX2M/bundle.json","state":"https://pith.science/pith/QQS5IZVZJRVJL7VC4KIDWLGX2M/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QQS5IZVZJRVJL7VC4KIDWLGX2M/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:QQS5IZVZJRVJL7VC4KIDWLGX2M","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":"7e185aa159b9a75fcfe73a0924342a9fd4975173ab2e2fb0a0718b65c95e574a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.atom-ph","submitted_at":"2023-08-01T02:48:33Z","title_canon_sha256":"87ae8908a6258e4f78979c6eb54186375e0037dbe51be3531de81e5ee3d9b74e"},"schema_version":"1.0","source":{"id":"2308.00241","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2308.00241","created_at":"2026-07-05T07:25:43Z"},{"alias_kind":"arxiv_version","alias_value":"2308.00241v2","created_at":"2026-07-05T07:25:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2308.00241","created_at":"2026-07-05T07:25:43Z"},{"alias_kind":"pith_short_12","alias_value":"QQS5IZVZJRVJ","created_at":"2026-07-05T07:25:43Z"},{"alias_kind":"pith_short_16","alias_value":"QQS5IZVZJRVJL7VC","created_at":"2026-07-05T07:25:43Z"},{"alias_kind":"pith_short_8","alias_value":"QQS5IZVZ","created_at":"2026-07-05T07:25:43Z"}],"graph_snapshots":[{"event_id":"sha256:e0e3f1c82596d258e65ca2c35d05f0ef07b9bf7f2f46f425d4c4224f4cc25dbc","target":"graph","created_at":"2026-07-05T07:25:43Z","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/2308.00241/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report laser cooling and trapping of $^{224}$Ra$^+$ ions. This was realized via two-step photoionization loading of radium into an ion trap. A robust source for $^{224}$Ra atoms, which have a 3.6-day half-life, was realized with an effusive oven containing $^{228}$Th, which has a 1.9-yr half-life, which continuously generates $^{224}$Ra via its $\\alpha$-decay. We characterized the efficacy of this source and found that after depleting built-up radium the thorium decay provides a continuous source of radium atoms suitable for ion trapping. The vacuum system has been sealed for more than 6 mo","authors_text":"A. M. Jayich, A. N. Gaiser, C. A. Holliman, H. Li, J. R. Griswold, M. Fan, M. S. Ladabaum, R. Kwapisz, Roy A. Ready, S. Kofford","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.atom-ph","submitted_at":"2023-08-01T02:48:33Z","title":"Laser cooling and trapping of $^{224}$Ra$^+$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2308.00241","kind":"arxiv","version":2},"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":"sha256:865889bbf69a497e3fb3dbdc8fef85f0ed866afa3f284c65e008e58fa0ab56fb","target":"record","created_at":"2026-07-05T07:25:43Z","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":"7e185aa159b9a75fcfe73a0924342a9fd4975173ab2e2fb0a0718b65c95e574a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.atom-ph","submitted_at":"2023-08-01T02:48:33Z","title_canon_sha256":"87ae8908a6258e4f78979c6eb54186375e0037dbe51be3531de81e5ee3d9b74e"},"schema_version":"1.0","source":{"id":"2308.00241","kind":"arxiv","version":2}},"canonical_sha256":"8425d466b94c6a95fea2e2903b2cd7d33663314dd8cd00ca2d689256166f41d2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8425d466b94c6a95fea2e2903b2cd7d33663314dd8cd00ca2d689256166f41d2","first_computed_at":"2026-07-05T07:25:43.474968Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:25:43.474968Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MwB/N81OajbHslZSpUMZ2KgEb31AEWZSDXIXVrG0IoDlb0jHLsU+HBmp9rtklvT7KH2pK59icF0FioNvOucUDg==","signature_status":"signed_v1","signed_at":"2026-07-05T07:25:43.475362Z","signed_message":"canonical_sha256_bytes"},"source_id":"2308.00241","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:865889bbf69a497e3fb3dbdc8fef85f0ed866afa3f284c65e008e58fa0ab56fb","sha256:e0e3f1c82596d258e65ca2c35d05f0ef07b9bf7f2f46f425d4c4224f4cc25dbc"],"state_sha256":"75894b1f4bac7d98eb0b262975f7769c65b75cd458449637d2429ef50906dd05"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EQuzmbkQGqxlhe5uv5UHiNbEU7rYvunms+v24ZjnJvK8enpI22k1Rdz60VkzknsY68mIBClJhKov+7apizAVCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-22T18:47:12.907141Z","bundle_sha256":"12b1ff66b80caa7433c93e041c25903955abf3b892a4e0b32be4931ecedf2d41"}}