{"paper":{"title":"Observation of Lambda H-4 hyperhydrogen by decay-pion spectroscopy in electron scattering","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Esser, A. Margaryan, A. Sanchez Lorente, A. Weber, B. S. Schlimme, C. Ayerbe Gayoso, C. Rappold, C. Sfienti, D. Bosnar, E. Kim, F. Schulz, H. Kanda, H. Merkel, I. Fri\\v{s}\\v{c}i\\'c, J. Kusaka, J. Pochodzalla, J. Reinhold, K. Tsukada, K. Yoshida, L. Debenjak, L. Tang, M. Kaneta, M. Mihovilovi\\v{c}, M. O. Distler, M. Schoth, M. Thiel, O. Borodina, O. Hashimoto, P. Achenbach, R. B\\\"ohm, S. Hirose, S. Nagao, S. N. Nakamura, S. S\\'anchez Majos, S. \\v{S}irca, T. Gogami, T. R. Saito, U. M\\\"uller, V. Bozkurt, Y. Fujii, Y. Kohl","submitted_at":"2015-01-27T17:17:21Z","abstract_excerpt":"At the Mainz Microtron MAMI, the first high-resolution pion spectroscopy from decays of strange systems was performed by electron scattering off a Be-9 target in order to study the ground-state masses of Lambda-hypernuclei. Positively charged kaons were detected by a short-orbit spectrometer with a broad momentum acceptance at zero degree forward angles with respect to the beam, efficiently tagging the production of strangeness in the target nucleus. In coincidence, negatively charged decay-pions were detected by two independent high-resolution spectrometers. About 10^3 pionic weak decays of h"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.06823","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"}