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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. 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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, $\\rm ^{19}_{\\Lambda}F$. 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