Gamma-ray spectroscopy of hypernuclei: Recent results and future plans |
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Authors: | H Tamura K Hosomi T Koike Y Ma M Mimori K Miwa K Shirotori M Ukai |
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Institution: | aDepartment of Physics, Tohoku University, Sendai 980-8578, Japan bCyclotron and Radio-Isotope Center, Tohoku University, Sendai 980-8578, Japan |
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Abstract: | A series of hypernuclear γ-ray spectroscopy experiments using a germanium detector array, Hyperball, have accumulated precise data on various p-shell Λ hypernuclei. Recently, 12ΛC and 11ΛB were studied at KEK using the (π+,K+γ) reaction, and a transition from a directly-populated spin-flip state, 16ΛO(2?), was observed in BNL E930 data. It is discussed whether the spin-dependent ΛN interaction parameters determined from previous experiments can consistently explain other γ spectroscopy data. At the J-PARC facility, further hypernuclear γ-ray spectroscopy experiments are planned, particularly to measure the g factor of a Λ in a nucleus from a spin-flip B(M1) value and to investigate the ΛN interaction more in detail. |
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Keywords: | Hypernuclei Hyperon–nucleon interactions Gamma transitions and level energies |
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