{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:KDK5FMH2Y6CU3YKGYBZZTMTPLM","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":"c03251419da1e8cfcd898bbe857c6115a3bcbd8871d9c7d0c95c135d66eed171","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-02-08T13:35:47Z","title_canon_sha256":"bfab0b15a7e82bae333640c416ab8d19ae2dd103054da37aa0ff915d2f1a84aa"},"schema_version":"1.0","source":{"id":"1902.03075","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.03075","created_at":"2026-05-17T23:42:23Z"},{"alias_kind":"arxiv_version","alias_value":"1902.03075v3","created_at":"2026-05-17T23:42:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.03075","created_at":"2026-05-17T23:42:23Z"},{"alias_kind":"pith_short_12","alias_value":"KDK5FMH2Y6CU","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"KDK5FMH2Y6CU3YKG","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"KDK5FMH2","created_at":"2026-05-18T12:33:21Z"}],"graph_snapshots":[{"event_id":"sha256:d924fe8407fa85d9f6713db7bb324a9ea8f91734ab0dd9c8fbadb4741217d411","target":"graph","created_at":"2026-05-17T23:42:23Z","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 propose a new experiment for decay pion spectroscopy of light hypernuclei at electron- and proton-beam facilities, using the recoil distance technique for separation of produced hypernuclei and a magnetic spectrometer for precise measurement of the decay pion momentum. Low-pressure MWPCs are advocated for low-energy recoil detection as they provide position and time information and are highly insensitive to gamma-ray and electron background. The position and timing characteristics of such a recoil detector were studied using ~5 MeV {\\alpha}-particles. By using the present proposed approach ","authors_text":"A. Margaryan, H. Vardanyan, J. Pochodzalla, J.R.M. Annand, K. Livingston, N. Grigoryan, P. Achenbach, R. Ajvazyan, R. Montgomery, S.Nagao, S.N.Nakamura, S. Zhamkochyan, V. Kakoyan, V. Khacatryan, Y.Toyama","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-02-08T13:35:47Z","title":"Decay pion spectroscopy: a new approach"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.03075","kind":"arxiv","version":3},"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:f79f31fb4bc22e4b4f72f189fc3168739366a994a6638af23b2c3c555850d483","target":"record","created_at":"2026-05-17T23:42:23Z","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":"c03251419da1e8cfcd898bbe857c6115a3bcbd8871d9c7d0c95c135d66eed171","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2019-02-08T13:35:47Z","title_canon_sha256":"bfab0b15a7e82bae333640c416ab8d19ae2dd103054da37aa0ff915d2f1a84aa"},"schema_version":"1.0","source":{"id":"1902.03075","kind":"arxiv","version":3}},"canonical_sha256":"50d5d2b0fac7854de146c07399b26f5b0558d78e05df7b952db91f52d989e02a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"50d5d2b0fac7854de146c07399b26f5b0558d78e05df7b952db91f52d989e02a","first_computed_at":"2026-05-17T23:42:23.955738Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:42:23.955738Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zIBpGf93ZgQVm3f2t/gkBSJuCSYE+X7k3COhvFngvAT+uEf4KAmVARoYtG8Fn5aNiXcVtbjwktjogAtvU7ZKAA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:42:23.956407Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.03075","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f79f31fb4bc22e4b4f72f189fc3168739366a994a6638af23b2c3c555850d483","sha256:d924fe8407fa85d9f6713db7bb324a9ea8f91734ab0dd9c8fbadb4741217d411"],"state_sha256":"3daf8eaa19b564a181d5f4ce8350a91554ba9dc83babd6b19ea119222fe95f66"}