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Bragadireanu, M. Cargnelli, M. Iio, M. Iliescu, M. Iwai, M. Iwasaki, M. Sato, M. Sekimoto, M. Tokuda, O. Morra, O. Vazquez Doce, P. Buehler, P. Kienle, Q. Zhang, R. S. Hayano, S. Ajimura, S. Choi, S. Enomoto, S. Ishimoto, S. Kawasaki, S. Okada, S. Suzuki, T. Fukuda, T. Hashimoto, T. Hiraiwa, T. Ishikawa, T. Nagae, T. Suzuki, T. Yamaga, T. Yamazaki, Y. Fujiwara, Y. Ishiguro, Y. Kato, Y. Ma, Y. Matsuda, Y. Mizoi, Y. Sada","submitted_at":"2020-06-24T02:38:15Z","abstract_excerpt":"We have performed an exclusive measurement of the $K^{-}+\\! ~^{3}{\\rm He} \\to \\Lambda pn$ reaction at an incident kaon momentum of $1\\ {\\rm GeV}/c$.In the $\\Lambda p$ invariant mass spectrum, a clear peak was observed below the mass threshold of $\\bar{K}\\!+\\!N\\!+\\!N$, as a signal of the kaonic nuclear bound state, $\\bar{K}NN$.The binding energy, decay width, and $S$-wave Gaussian reaction form-factor of this state were observed to be $B_{K} = 42\\pm3({\\rm stat.})^{+3}_{-4}({\\rm syst.})\\ {\\rm MeV}$, $\\Gamma_{K} = 100\\pm7({\\rm stat.})^{+19}_{-9}({\\rm syst.})\\ {\\rm MeV}$, and $Q_{K} = 383\\pm11({\\r"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2006.13433","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-ex","submitted_at":"2020-06-24T02:38:15Z","cross_cats_sorted":[],"title_canon_sha256":"f1ad14b2fceb5b4f69dabe78bd79695df3eb55e56b07f105bdde70257fffa7b8","abstract_canon_sha256":"7dd3c0527e01d3f9851fa1cbd67a16f71b5b8be278ca22f1b24b14b2fff6d7db"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:44:40.287851Z","signature_b64":"jgoZ3qnsdwWii3/sTRqIHxBpIRw3V93bd9scec/G4nyTBN1G3GK54Ib62m2o1QMt1/lb76R/K9Zd/iEJqcJjBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"744c477bf3470b702d05ebae6d749f9e3b56d2093878b93c7084eada35790542","last_reissued_at":"2026-07-05T01:44:40.287380Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:44:40.287380Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Observation of a $\\bar{K}NN$ bound state in the $^3{\\rm He} (K^-, \\Lambda p)n$ reaction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. 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Sada","submitted_at":"2020-06-24T02:38:15Z","abstract_excerpt":"We have performed an exclusive measurement of the $K^{-}+\\! ~^{3}{\\rm He} \\to \\Lambda pn$ reaction at an incident kaon momentum of $1\\ {\\rm GeV}/c$.In the $\\Lambda p$ invariant mass spectrum, a clear peak was observed below the mass threshold of $\\bar{K}\\!+\\!N\\!+\\!N$, as a signal of the kaonic nuclear bound state, $\\bar{K}NN$.The binding energy, decay width, and $S$-wave Gaussian reaction form-factor of this state were observed to be $B_{K} = 42\\pm3({\\rm stat.})^{+3}_{-4}({\\rm syst.})\\ {\\rm MeV}$, $\\Gamma_{K} = 100\\pm7({\\rm stat.})^{+19}_{-9}({\\rm syst.})\\ {\\rm MeV}$, and $Q_{K} = 383\\pm11({\\r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2006.13433","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2006.13433/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2006.13433","created_at":"2026-07-05T01:44:40.287439+00:00"},{"alias_kind":"arxiv_version","alias_value":"2006.13433v1","created_at":"2026-07-05T01:44:40.287439+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2006.13433","created_at":"2026-07-05T01:44:40.287439+00:00"},{"alias_kind":"pith_short_12","alias_value":"ORGEO67TI4FX","created_at":"2026-07-05T01:44:40.287439+00:00"},{"alias_kind":"pith_short_16","alias_value":"ORGEO67TI4FXALIF","created_at":"2026-07-05T01:44:40.287439+00:00"},{"alias_kind":"pith_short_8","alias_value":"ORGEO67T","created_at":"2026-07-05T01:44:40.287439+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/ORGEO67TI4FXALIF5OXG25E7TY","json":"https://pith.science/pith/ORGEO67TI4FXALIF5OXG25E7TY.json","graph_json":"https://pith.science/api/pith-number/ORGEO67TI4FXALIF5OXG25E7TY/graph.json","events_json":"https://pith.science/api/pith-number/ORGEO67TI4FXALIF5OXG25E7TY/events.json","paper":"https://pith.science/paper/ORGEO67T"},"agent_actions":{"view_html":"https://pith.science/pith/ORGEO67TI4FXALIF5OXG25E7TY","download_json":"https://pith.science/pith/ORGEO67TI4FXALIF5OXG25E7TY.json","view_paper":"https://pith.science/paper/ORGEO67T","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2006.13433&json=true","fetch_graph":"https://pith.science/api/pith-number/ORGEO67TI4FXALIF5OXG25E7TY/graph.json","fetch_events":"https://pith.science/api/pith-number/ORGEO67TI4FXALIF5OXG25E7TY/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/ORGEO67TI4FXALIF5OXG25E7TY/action/timestamp_anchor","attest_storage":"https://pith.science/pith/ORGEO67TI4FXALIF5OXG25E7TY/action/storage_attestation","attest_author":"https://pith.science/pith/ORGEO67TI4FXALIF5OXG25E7TY/action/author_attestation","sign_citation":"https://pith.science/pith/ORGEO67TI4FXALIF5OXG25E7TY/action/citation_signature","submit_replication":"https://pith.science/pith/ORGEO67TI4FXALIF5OXG25E7TY/action/replication_record"}},"created_at":"2026-07-05T01:44:40.287439+00:00","updated_at":"2026-07-05T01:44:40.287439+00:00"}