{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:XTPNOTXVRUXFFNDMBPB2CHHRCS","short_pith_number":"pith:XTPNOTXV","canonical_record":{"source":{"id":"1511.02472","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-11-08T12:03:33Z","cross_cats_sorted":["nucl-ex"],"title_canon_sha256":"78f80e4382e1cce3dc022ac6e3f4e03fec461094193901c42c310487600928d5","abstract_canon_sha256":"a2badd9cbb9409694f52cc064081b9778848db5d7fcd697548cdf50428dbe46f"},"schema_version":"1.0"},"canonical_sha256":"bcded74ef58d2e52b46c0bc3a11cf114b477e47721ae53322ec4ab46ad655c05","source":{"kind":"arxiv","id":"1511.02472","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1511.02472","created_at":"2026-05-18T01:11:21Z"},{"alias_kind":"arxiv_version","alias_value":"1511.02472v2","created_at":"2026-05-18T01:11:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.02472","created_at":"2026-05-18T01:11:21Z"},{"alias_kind":"pith_short_12","alias_value":"XTPNOTXVRUXF","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_16","alias_value":"XTPNOTXVRUXFFNDM","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_8","alias_value":"XTPNOTXV","created_at":"2026-05-18T12:29:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:XTPNOTXVRUXFFNDMBPB2CHHRCS","target":"record","payload":{"canonical_record":{"source":{"id":"1511.02472","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-11-08T12:03:33Z","cross_cats_sorted":["nucl-ex"],"title_canon_sha256":"78f80e4382e1cce3dc022ac6e3f4e03fec461094193901c42c310487600928d5","abstract_canon_sha256":"a2badd9cbb9409694f52cc064081b9778848db5d7fcd697548cdf50428dbe46f"},"schema_version":"1.0"},"canonical_sha256":"bcded74ef58d2e52b46c0bc3a11cf114b477e47721ae53322ec4ab46ad655c05","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:11:21.671875Z","signature_b64":"VX9xL+zle5On4eEPmVfZ//cTKD0u7cmnXNVsPlEqMk2OnNWIl7W3+tlEXT7EcvhroMi4mkNoPHhU+pO4hh1ZBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bcded74ef58d2e52b46c0bc3a11cf114b477e47721ae53322ec4ab46ad655c05","last_reissued_at":"2026-05-18T01:11:21.671299Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:11:21.671299Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1511.02472","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":"2026-05-18T01:11:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EZRGOkiyawlkEmXXHoZ469SB1Z24eFxfg9sgZUFH/VHY9L6a3WBUYpGIJ934dARTTtjB18uW+GSd5M4m8e8TAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T02:31:35.486413Z"},"content_sha256":"9d7ac122d7a811fb19f66cf8dbea0f7e38084ce30d35040f22174282baf43c75","schema_version":"1.0","event_id":"sha256:9d7ac122d7a811fb19f66cf8dbea0f7e38084ce30d35040f22174282baf43c75"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:XTPNOTXVRUXFFNDMBPB2CHHRCS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Development of Water $\\v{C}$erenkov Detector for On-line Proton Rejection in $\\Xi^{-}$ Hypernuclear Spectroscopy via the $(K^{-},K^{+})$ Reaction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex"],"primary_cat":"physics.ins-det","authors_text":"K. Takenaka, N. Amano, S. Kanatsuki, T. Gogami, T. Nagae","submitted_at":"2015-11-08T12:03:33Z","abstract_excerpt":"The missing mass spectroscopy of $\\Xi^{-}$ hypernuclei with the $(K^{-},K^{+})$ reaction is planned to be performed at the J-PARC K1.8 beam line by using a new magnetic spectrometer, Strangeness $-2$ Spectrometer (S-2S). A $\\v{C}$cerenkov detector with a radiation medium of pure water (refractive index of 1.33) is designed to be used for on-line proton rejection for a momentum range of 1.2 to 1.6 GeV/$c$ in S-2S. Prototype water $\\v{C}$erenkov detectors were developed and tested with positron beams and cosmic rays to estimate their proton-rejection capability. We achieved an average number of "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.02472","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":"2026-05-18T01:11:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o86qtp0tXMLfPuoJ42vaBri2vm4aWM3ikQ6Lb3FO2eloDeIMrisr2I2WrIB1aSx4RHmjkpQ4mrb7ukled64LBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T02:31:35.486775Z"},"content_sha256":"ee621cd29f7530b602054e906c66bbe3fd92d64cdd2e2818533b614232245ff7","schema_version":"1.0","event_id":"sha256:ee621cd29f7530b602054e906c66bbe3fd92d64cdd2e2818533b614232245ff7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XTPNOTXVRUXFFNDMBPB2CHHRCS/bundle.json","state_url":"https://pith.science/pith/XTPNOTXVRUXFFNDMBPB2CHHRCS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XTPNOTXVRUXFFNDMBPB2CHHRCS/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":"2026-06-20T02:31:35Z","links":{"resolver":"https://pith.science/pith/XTPNOTXVRUXFFNDMBPB2CHHRCS","bundle":"https://pith.science/pith/XTPNOTXVRUXFFNDMBPB2CHHRCS/bundle.json","state":"https://pith.science/pith/XTPNOTXVRUXFFNDMBPB2CHHRCS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XTPNOTXVRUXFFNDMBPB2CHHRCS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:XTPNOTXVRUXFFNDMBPB2CHHRCS","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":"a2badd9cbb9409694f52cc064081b9778848db5d7fcd697548cdf50428dbe46f","cross_cats_sorted":["nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-11-08T12:03:33Z","title_canon_sha256":"78f80e4382e1cce3dc022ac6e3f4e03fec461094193901c42c310487600928d5"},"schema_version":"1.0","source":{"id":"1511.02472","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1511.02472","created_at":"2026-05-18T01:11:21Z"},{"alias_kind":"arxiv_version","alias_value":"1511.02472v2","created_at":"2026-05-18T01:11:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.02472","created_at":"2026-05-18T01:11:21Z"},{"alias_kind":"pith_short_12","alias_value":"XTPNOTXVRUXF","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_16","alias_value":"XTPNOTXVRUXFFNDM","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_8","alias_value":"XTPNOTXV","created_at":"2026-05-18T12:29:50Z"}],"graph_snapshots":[{"event_id":"sha256:ee621cd29f7530b602054e906c66bbe3fd92d64cdd2e2818533b614232245ff7","target":"graph","created_at":"2026-05-18T01:11:21Z","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":"The missing mass spectroscopy of $\\Xi^{-}$ hypernuclei with the $(K^{-},K^{+})$ reaction is planned to be performed at the J-PARC K1.8 beam line by using a new magnetic spectrometer, Strangeness $-2$ Spectrometer (S-2S). A $\\v{C}$cerenkov detector with a radiation medium of pure water (refractive index of 1.33) is designed to be used for on-line proton rejection for a momentum range of 1.2 to 1.6 GeV/$c$ in S-2S. Prototype water $\\v{C}$erenkov detectors were developed and tested with positron beams and cosmic rays to estimate their proton-rejection capability. We achieved an average number of ","authors_text":"K. Takenaka, N. Amano, S. Kanatsuki, T. Gogami, T. Nagae","cross_cats":["nucl-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-11-08T12:03:33Z","title":"Development of Water $\\v{C}$erenkov Detector for On-line Proton Rejection in $\\Xi^{-}$ Hypernuclear Spectroscopy via the $(K^{-},K^{+})$ Reaction"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.02472","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":"sha256:9d7ac122d7a811fb19f66cf8dbea0f7e38084ce30d35040f22174282baf43c75","target":"record","created_at":"2026-05-18T01:11:21Z","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":"a2badd9cbb9409694f52cc064081b9778848db5d7fcd697548cdf50428dbe46f","cross_cats_sorted":["nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2015-11-08T12:03:33Z","title_canon_sha256":"78f80e4382e1cce3dc022ac6e3f4e03fec461094193901c42c310487600928d5"},"schema_version":"1.0","source":{"id":"1511.02472","kind":"arxiv","version":2}},"canonical_sha256":"bcded74ef58d2e52b46c0bc3a11cf114b477e47721ae53322ec4ab46ad655c05","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bcded74ef58d2e52b46c0bc3a11cf114b477e47721ae53322ec4ab46ad655c05","first_computed_at":"2026-05-18T01:11:21.671299Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:11:21.671299Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VX9xL+zle5On4eEPmVfZ//cTKD0u7cmnXNVsPlEqMk2OnNWIl7W3+tlEXT7EcvhroMi4mkNoPHhU+pO4hh1ZBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:11:21.671875Z","signed_message":"canonical_sha256_bytes"},"source_id":"1511.02472","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9d7ac122d7a811fb19f66cf8dbea0f7e38084ce30d35040f22174282baf43c75","sha256:ee621cd29f7530b602054e906c66bbe3fd92d64cdd2e2818533b614232245ff7"],"state_sha256":"3aad4c98ab32c8610033a9e3cd8a5d884878768292bc7622b511025333bcbfbb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FrB7tGlzGS+HiIk1XXV4RdF2S3IQjZu7alDI4e8mwEyr863f0c3HBUU3Vso//leRNLexxEKKXCgRvaJm558xDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-20T02:31:35.488839Z","bundle_sha256":"a2ee125df072c318f3f6087721ac87ca67a51e1fc0ed7ea3b428da33c600dcdc"}}