Precise determination of ¹²ΛC level structure by γ-ray spectroscopy
Hosomi, K. · Ma, T. · Ajimura, S. · Aoki, K. · Dairaku, S. · Fu, Y. Y. · Fujioka, H. · Futatsukawa, K. · Imoto, W. · Kakiguchi, Y. · Kawai, M. · Kinoshita, S. · Koike, T. · Maruyama, N. · Mimori, M. · Minami, S. · Miura, Y. · Miwa, K. · Miyagi, Y. · Nagae, T. · Nakajima, D. · Noumi, H. · Shirotori, K. · Suzuki, T. · Takahashi, T. · Takahashi, T. N. · Tamura, H. · Tanida, K. · Terada, N. · Toyoda, A. · Tsukada, K. · Ukai, M. · Zhou, S. H.
Original · EN
Level structure of the ¹²ΛC hypernucleus was precisely determined by means of γ-ray spectroscopy. We identified four γ-ray transitions via the ¹²C(π⁺,K⁺γ) reaction using a germanium detector array, Hyperball2. The spacing of the ground-state doublet (2⁻₁,1⁻₁) was measured to be 161.5±0.3(stat)±0.3(syst)keV from the direct M1 transition. Excitation energies of the 1⁻₂ and 1⁻₃ states were measured to be 2832±3±4keV and 6050±8±7keV, respectively. The obtained level energies provide definitive references for the reaction spectroscopy of Λ hypernuclei.
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