{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:LDEWWCNQLHFBW5RYBIHUWELROI","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":"38fd530504343ebf2f47c02c375058bbb47be82c0b5be821b97a8033aa7b82e9","cross_cats_sorted":["hep-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2012-12-20T16:53:48Z","title_canon_sha256":"8565343513391cab3e1d332c4ec3a92e6c08a0c35f53e0fee2783e371dc8b425"},"schema_version":"1.0","source":{"id":"1212.5136","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1212.5136","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"arxiv_version","alias_value":"1212.5136v1","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1212.5136","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"pith_short_12","alias_value":"LDEWWCNQLHFB","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"LDEWWCNQLHFBW5RY","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"LDEWWCNQ","created_at":"2026-05-18T12:27:14Z"}],"graph_snapshots":[{"event_id":"sha256:e54a1ed82f6e2c2332400cdd8479d228dddc18889c6343e452df6d173526c286","target":"graph","created_at":"2026-05-18T01:52:29Z","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":"A new method for measuring trace amounts of krypton in xenon using a cold trap with a residual gas analyzer has been developed, which achieves an increased sensitivity by temporarily reducing the pumping speed while expending a minimal amount of xenon. By partially closing a custom built butterfly valve between the measurement chamber and the turbomolecular pump, a sensitivity of 40 ppt has been reached. This method has been tested on an ultra-pure gas sample from Air Liquide with an unknown intrinsic krypton concentration, yielding a krypton concentration of $330 \\pm 200$ ppt.","authors_text":"Christian Huhmann, Christian Weinheimer, Ethan Brown, Hans Kettling, Stephan Rosendahl","cross_cats":["hep-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2012-12-20T16:53:48Z","title":"In situ measurements of Krypton in Xenon gas with a quadrupole mass spectrometer following a cold-trap at a temporarily reduced pumping speed"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1212.5136","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":"sha256:4548de3bd3d61da7d3836b2d20e3b6497f86c880f0a17d4abd2b3af2295ba53a","target":"record","created_at":"2026-05-18T01:52:29Z","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":"38fd530504343ebf2f47c02c375058bbb47be82c0b5be821b97a8033aa7b82e9","cross_cats_sorted":["hep-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2012-12-20T16:53:48Z","title_canon_sha256":"8565343513391cab3e1d332c4ec3a92e6c08a0c35f53e0fee2783e371dc8b425"},"schema_version":"1.0","source":{"id":"1212.5136","kind":"arxiv","version":1}},"canonical_sha256":"58c96b09b059ca1b76380a0f4b117172043d6debbad214641abb3fe9335f764c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"58c96b09b059ca1b76380a0f4b117172043d6debbad214641abb3fe9335f764c","first_computed_at":"2026-05-18T01:52:29.716527Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:52:29.716527Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TV8bgxSdgvqGS22nHfzzbYrzVVS0jGRb4Rpv7DpKAVWCa4HTVSwIxp0LCByRNSZEM3pn4sjxg2HDOlNMWenDCg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:52:29.717019Z","signed_message":"canonical_sha256_bytes"},"source_id":"1212.5136","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4548de3bd3d61da7d3836b2d20e3b6497f86c880f0a17d4abd2b3af2295ba53a","sha256:e54a1ed82f6e2c2332400cdd8479d228dddc18889c6343e452df6d173526c286"],"state_sha256":"9249c63245c6fc12e421aaa39c22cdd8e7dab55b7a4f54dc042f2b5583e33a21"}