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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. 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