{"paper":{"title":"Precise determination of $^{12}_{\\Lambda}$C level structure by $\\gamma$-ray spectroscopy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"nucl-ex","authors_text":"A. Toyoda, D. Nakajima, H. Fujioka, H. Noumi, H. Tamura, K. Aoki, K. Futatsukawa, K. Hosomi, K. Miwa, K. Shirotori, K. Tanida, K. Tsukada, M. Kawai, M. Mimori, M. Ukai, N. Maruyama, N. Terada, S. Ajimura, S. Dairaku, S. H. Zhou, S. Kinoshita, S. Minami, T. Koike, T. Ma, T. Nagae, T. N. Takahashi, T. Suzuki, T. Takahashi, W. Imoto, Y. Kakiguchi, Y. Miura, Y. Miyagi, Y. Y. Fu","submitted_at":"2015-03-29T00:41:19Z","abstract_excerpt":"Level structure of the $^{12}_{\\Lambda}$C hypernucleus was precisely determined by means of $\\gamma$-ray spectroscopy. We identified four $\\gamma$-ray transitions via the $^{12}$C$(\\pi^{+},K^{+}\\gamma)$ reaction using a germanium detector array, Hyperball2. The spacing of the ground-state doublet $(2^{-}_{1},1^{-}_{1})$ was measured to be $161.5\\pm0.3\\text{(stat)}\\pm0.3\\text{(syst)}$\\,keV from the direct $M1$ transition. Excitation energies of the $1^{-}_{2}$ and $1^{-}_{3}$ states were measured to be $2832\\pm3\\pm4$\\,keV and $6050\\pm8\\pm7$\\,keV, respectively. The obtained level energies provid"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.08372","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"}