{"paper":{"title":"First Determination of Level Structure of an $sd$-Shell Hypernucleus, $\\rm {^{19}_{\\Lambda}F}$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Feliciello, A. Sakaguchi, H. Ekawa, H. Sako, H. Sugimura, H. Tamura, J. K. Ahn, J. Y. Lee, K. Aoki, K. Hosomi, K. Imai, K. Kobayashi, K. Miwa, K. Shirotori, K. Tanida, M. Fujita, M. Ikeda, M. Nakagawa, M. Ukai, N. Chiga, N. Ichige, P. Evtoukhovitch, R. Honda, S. B. Yang, S. Hasegawa, S. Hayakawa, S. H. Hwang, S. H. Kim, S. Ishimoto, S. Kanatsuki, S. Kinbara, S. Sato, S. Suto, S. Suzuki, T. F. Wang, T. Hayakawa, T. J. Moon, T. Koike, T. Nagae, T. O. Yamamoto, T. Takahashi, Y. Akazawa, Y. Ichikawa, Y. Nakada, Y. Ogura, Y. Sasaki, Y. Togawa, Z. Tsamalaidze","submitted_at":"2017-12-20T17:52:52Z","abstract_excerpt":"We report on the first observation of $\\gamma$ rays emitted from an $sd$-shell hypernucleus, $\\rm ^{19}_{\\Lambda}F$. The energy spacing between the ground state doublet, $1/2^{+}$ and $3/2^{+}$ states, of $\\rm ^{19}_{\\Lambda}F$ is determined to be $\\rm 315.5 \\pm 0.4 (stat) ^{+0.6}_{-0.5} (syst)~keV$ by measuring the $\\gamma$-ray energy from the $M1(3/2^{+} \\rightarrow 1/2^{+})$ transition. In addition, three $\\gamma$-ray peaks were observed and assigned as $E2(5/2^{+} \\rightarrow 1/2^{+})$, $E1(1/2^{-} \\rightarrow 1/2^{+})$, and $E1(1/2^{-} \\rightarrow 3/2^{+})$ transitions. The excitation ene"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1712.07608","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":""},"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"}