{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:OJO7R2IFFZNM4N756PW25ONYEV","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":"e746eb3ff6c1a01d886f0b7ced6db083c764e603c1218fbca235251bef75f6fa","cross_cats_sorted":["nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2016-07-14T13:02:43Z","title_canon_sha256":"1a36e2b419ce3112170c41c94a1aff79b5ec4ebb5dcf1ee3bc57890704dbabbd"},"schema_version":"1.0","source":{"id":"1607.04117","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1607.04117","created_at":"2026-05-17T23:57:51Z"},{"alias_kind":"arxiv_version","alias_value":"1607.04117v1","created_at":"2026-05-17T23:57:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1607.04117","created_at":"2026-05-17T23:57:51Z"},{"alias_kind":"pith_short_12","alias_value":"OJO7R2IFFZNM","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"OJO7R2IFFZNM4N75","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"OJO7R2IF","created_at":"2026-05-18T12:30:36Z"}],"graph_snapshots":[{"event_id":"sha256:72ec463dc3d0f11cf6c29fe6695307cef27d995d9597a50567b2f81b90638fcb","target":"graph","created_at":"2026-05-17T23:57:51Z","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":"As low as possible radioactive contamination of a detector plays a crucial role to improve sensitivity of a double beta decay experiment. The radioactive contamination of a sample of $^{116}$CdWO$_4$ crystal scintillator by thorium was reduced by a factor $\\approx 10$, down to the level 0.01 mBq/kg ($^{228}$Th), by exploiting the recrystallization procedure. The total alpha activity of uranium and thorium daughters was reduced by a factor $\\approx 3$, down to 1.6 mBq/kg. No change in the specific activity (the total $\\alpha$ activity and $^{228}$Th) was observed in a sample of ZnWO$_4$ crystal","authors_text":"A. Incicchitti, A.S. Barabash, F.A. Danevich, F. Cappella, I.A. Tupitsyna, M. Laubenstein, O.E. Safonova, O.G. Polischuk, P. Belli, R. Bernabei, R. Cerulli, S.I. Konovalov, V. Caracciolo, V.I. Tretyak, V.I. Umatov, V.M. Mokina, V.N. Shlegel, V.N. Zhdankov, V.V. Kobychev, Yu.A. Borovlev","cross_cats":["nucl-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2016-07-14T13:02:43Z","title":"Improvement of radiopurity level of enriched $^{116}$CdWO$_4$ and ZnWO$_4$ crystal scintillators by recrystallization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.04117","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:eb914d23186fced1327609b296eb72b0b17712ec0d2113b71b3cde1cd90f8799","target":"record","created_at":"2026-05-17T23:57:51Z","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":"e746eb3ff6c1a01d886f0b7ced6db083c764e603c1218fbca235251bef75f6fa","cross_cats_sorted":["nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2016-07-14T13:02:43Z","title_canon_sha256":"1a36e2b419ce3112170c41c94a1aff79b5ec4ebb5dcf1ee3bc57890704dbabbd"},"schema_version":"1.0","source":{"id":"1607.04117","kind":"arxiv","version":1}},"canonical_sha256":"725df8e9052e5ace37fdf3edaeb9b82562c9d7d2c223e09c8be1f50447185ffd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"725df8e9052e5ace37fdf3edaeb9b82562c9d7d2c223e09c8be1f50447185ffd","first_computed_at":"2026-05-17T23:57:51.146657Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:57:51.146657Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sECr7NkNUyWH7hF4kLOu3PLSUtr91LYkXTbCh1yPGv6bn78e6yaUVqqvlBn1UuDv8j8zg0DeLsqGEOG7zSQHAQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:57:51.147382Z","signed_message":"canonical_sha256_bytes"},"source_id":"1607.04117","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:eb914d23186fced1327609b296eb72b0b17712ec0d2113b71b3cde1cd90f8799","sha256:72ec463dc3d0f11cf6c29fe6695307cef27d995d9597a50567b2f81b90638fcb"],"state_sha256":"0dea2f15a2df3fa0c18bc1258d5571a66c585ba9f5051721b5563297fb71e47e"}