{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:O6SCSXB4FSQ2WHBSRAP4JUZMQ2","short_pith_number":"pith:O6SCSXB4","canonical_record":{"source":{"id":"1806.07624","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-06-20T09:20:51Z","cross_cats_sorted":[],"title_canon_sha256":"d415178c1e62bcdb3e6883aaff34104f764fad739f84d18765d4f43156313a83","abstract_canon_sha256":"9914f6308a79eb770e0e139291dc406f239c05b5a046ad2fd430983f0fa30856"},"schema_version":"1.0"},"canonical_sha256":"77a4295c3c2ca1ab1c32881fc4d32c86ace4d1665e93e901636ff1db3b5615a6","source":{"kind":"arxiv","id":"1806.07624","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.07624","created_at":"2026-05-17T23:58:38Z"},{"alias_kind":"arxiv_version","alias_value":"1806.07624v2","created_at":"2026-05-17T23:58:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.07624","created_at":"2026-05-17T23:58:38Z"},{"alias_kind":"pith_short_12","alias_value":"O6SCSXB4FSQ2","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_16","alias_value":"O6SCSXB4FSQ2WHBS","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_8","alias_value":"O6SCSXB4","created_at":"2026-05-18T12:32:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:O6SCSXB4FSQ2WHBSRAP4JUZMQ2","target":"record","payload":{"canonical_record":{"source":{"id":"1806.07624","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-06-20T09:20:51Z","cross_cats_sorted":[],"title_canon_sha256":"d415178c1e62bcdb3e6883aaff34104f764fad739f84d18765d4f43156313a83","abstract_canon_sha256":"9914f6308a79eb770e0e139291dc406f239c05b5a046ad2fd430983f0fa30856"},"schema_version":"1.0"},"canonical_sha256":"77a4295c3c2ca1ab1c32881fc4d32c86ace4d1665e93e901636ff1db3b5615a6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:58:38.817621Z","signature_b64":"PcDReAl/BhtF/d8FkUKJ4kzFvOtvp7Zb3tT5NZLZ/46WunkmoQhe0LbO7t/wZhRzJDEAduUVjb2dIWFlpvKABA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"77a4295c3c2ca1ab1c32881fc4d32c86ace4d1665e93e901636ff1db3b5615a6","last_reissued_at":"2026-05-17T23:58:38.816927Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:58:38.816927Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1806.07624","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":"2026-05-17T23:58:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6uaTMa4eEKzZGEATl2uR6gqKAWGSgj6Zirejb+3BOA0z8bAPKIdilV3uXksO5V5sweyi2pSk2mqIKghcDD8BCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T17:18:41.583825Z"},"content_sha256":"333be3613ce0155cb979c6bbae88041c37296a4ec3291fef03142d36eac414be","schema_version":"1.0","event_id":"sha256:333be3613ce0155cb979c6bbae88041c37296a4ec3291fef03142d36eac414be"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:O6SCSXB4FSQ2WHBSRAP4JUZMQ2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Nuclear hyperpolarization of 3He by magnetized plasmas","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"A. Maul, E. Otten, G. Tastevin, P. Bl\\\"umler, P.-J. Nacher, W. Heil","submitted_at":"2018-06-20T09:20:51Z","abstract_excerpt":"We describe a method to hyperpolarize 3He nuclear spins at high magnetic fields (4.7 Tesla) solely by a magnetized plasma. The conditions for such a magnetized plasma are fulfilled when the mean free path of the free electrons is much larger than their gyration radius in the rf gas discharge. Investigations are carried out in the 1-15 mbar pressure range with rf excitation at ~100 MHz. Quantitative NMR measurements show that for different cell sizes and 3He densities nuclear polarizations in the range 1% to 9% are observed. We explain this phenomenon by an alignment-to-orientation conversion m"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.07624","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":""},"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":"2026-05-17T23:58:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xorlLK20FAd+UG0aUYTojEwxEyYZwz1Z4UUZCQk9uf28aW33Bp4Cny6ZnAD04Sk3rGvkYsdr4GtMKWVxes/wDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T17:18:41.584173Z"},"content_sha256":"dc48b6f7f48ddcd3003d33b83ecc9ef4163e33efd48288fa07547de4cfd84456","schema_version":"1.0","event_id":"sha256:dc48b6f7f48ddcd3003d33b83ecc9ef4163e33efd48288fa07547de4cfd84456"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/O6SCSXB4FSQ2WHBSRAP4JUZMQ2/bundle.json","state_url":"https://pith.science/pith/O6SCSXB4FSQ2WHBSRAP4JUZMQ2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/O6SCSXB4FSQ2WHBSRAP4JUZMQ2/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":"2026-05-18T17:18:41Z","links":{"resolver":"https://pith.science/pith/O6SCSXB4FSQ2WHBSRAP4JUZMQ2","bundle":"https://pith.science/pith/O6SCSXB4FSQ2WHBSRAP4JUZMQ2/bundle.json","state":"https://pith.science/pith/O6SCSXB4FSQ2WHBSRAP4JUZMQ2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/O6SCSXB4FSQ2WHBSRAP4JUZMQ2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:O6SCSXB4FSQ2WHBSRAP4JUZMQ2","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":"9914f6308a79eb770e0e139291dc406f239c05b5a046ad2fd430983f0fa30856","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-06-20T09:20:51Z","title_canon_sha256":"d415178c1e62bcdb3e6883aaff34104f764fad739f84d18765d4f43156313a83"},"schema_version":"1.0","source":{"id":"1806.07624","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.07624","created_at":"2026-05-17T23:58:38Z"},{"alias_kind":"arxiv_version","alias_value":"1806.07624v2","created_at":"2026-05-17T23:58:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.07624","created_at":"2026-05-17T23:58:38Z"},{"alias_kind":"pith_short_12","alias_value":"O6SCSXB4FSQ2","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_16","alias_value":"O6SCSXB4FSQ2WHBS","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_8","alias_value":"O6SCSXB4","created_at":"2026-05-18T12:32:43Z"}],"graph_snapshots":[{"event_id":"sha256:dc48b6f7f48ddcd3003d33b83ecc9ef4163e33efd48288fa07547de4cfd84456","target":"graph","created_at":"2026-05-17T23:58:38Z","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 method to hyperpolarize 3He nuclear spins at high magnetic fields (4.7 Tesla) solely by a magnetized plasma. The conditions for such a magnetized plasma are fulfilled when the mean free path of the free electrons is much larger than their gyration radius in the rf gas discharge. Investigations are carried out in the 1-15 mbar pressure range with rf excitation at ~100 MHz. Quantitative NMR measurements show that for different cell sizes and 3He densities nuclear polarizations in the range 1% to 9% are observed. We explain this phenomenon by an alignment-to-orientation conversion m","authors_text":"A. Maul, E. Otten, G. Tastevin, P. Bl\\\"umler, P.-J. Nacher, W. Heil","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-06-20T09:20:51Z","title":"Nuclear hyperpolarization of 3He by magnetized plasmas"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.07624","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":"sha256:333be3613ce0155cb979c6bbae88041c37296a4ec3291fef03142d36eac414be","target":"record","created_at":"2026-05-17T23:58:38Z","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":"9914f6308a79eb770e0e139291dc406f239c05b5a046ad2fd430983f0fa30856","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-06-20T09:20:51Z","title_canon_sha256":"d415178c1e62bcdb3e6883aaff34104f764fad739f84d18765d4f43156313a83"},"schema_version":"1.0","source":{"id":"1806.07624","kind":"arxiv","version":2}},"canonical_sha256":"77a4295c3c2ca1ab1c32881fc4d32c86ace4d1665e93e901636ff1db3b5615a6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"77a4295c3c2ca1ab1c32881fc4d32c86ace4d1665e93e901636ff1db3b5615a6","first_computed_at":"2026-05-17T23:58:38.816927Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:58:38.816927Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"PcDReAl/BhtF/d8FkUKJ4kzFvOtvp7Zb3tT5NZLZ/46WunkmoQhe0LbO7t/wZhRzJDEAduUVjb2dIWFlpvKABA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:58:38.817621Z","signed_message":"canonical_sha256_bytes"},"source_id":"1806.07624","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:333be3613ce0155cb979c6bbae88041c37296a4ec3291fef03142d36eac414be","sha256:dc48b6f7f48ddcd3003d33b83ecc9ef4163e33efd48288fa07547de4cfd84456"],"state_sha256":"5f066102db69f40c8bd9d23f5f5b866bf341d155a4db9f34f8fb11a5623dbf06"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QsV6hIko+4HiBbQOtcHKv8gWWxpbeusj63sZ5AIgzF//4y+WbSXS/U8TLYK6ifSpqRYNNiK9NBo/O47P9r2TBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-18T17:18:41.585802Z","bundle_sha256":"2032c597a8d7bdc66ff2f4caea3717a442a4ffc86b1c05173195b1c87569b9e9"}}