{"paper":{"title":"Exclusive Measurement of the Nonmesonic Weak Decay of ^{5}_{\\Lambda}He Hypernucleus","license":"","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A.Banu, A.Toyoda, B.H.Kang, E.H.Kim, H.Bhang, H.J.Yim, H.Noumi, H.Outa, H.Park, H.Tamura, J.H.Kim, J.I.Hwang, K.Aoki, K.Tanida, K.Tsukada, M.J.Kim, M.Nakamura, M.Sekimoto, O.Hashimoto, P.K.Saha, S.Ajimura, S.Kameoka, S.N.Nakamura, S.Okada, T.Fukuda, T.Maruta, T.Nagae, T.Takahashi, T.Watanabe, Y.Miura, Y.Miyake, Y.Okayasu, Y.Sato","submitted_at":"2005-09-11T17:25:17Z","abstract_excerpt":"We performed a coincidence measurement of two nucleons emitted from the nonmesonic weak decay (NMWD) of ^{5}_{\\Lambda}He formed via the ^{6}Li(\\pi^+,K^+) reaction. The energies of two nucleons and the pair number distributions in the opening angle between them were measured. In both np and nn pairs, we observed a clean back-to-back correlation coming from the two-body decay of \\Lambda p --> n p and \\Lambda n --> n n, respectively. The ratio of the nucleon pair numbers was N_{nn}/N_{np}=0.45 \\pm 0.11(stat)\\pm 0.03(syst) in the kinematic region of cos(theta_{NN}) < -0.8. Since each decay mode wa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"nucl-ex/0509015","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"}