Production and decay spectra of hypernuclei by double-charge exchange reactions, and hyperon mixing

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We have theoretically demonstrated production and decay of spectra of hypernuclei by double-charge exchange reactions, e.g. (Ｋ〓，Ｋ〓), (π〓，Ｋ〓), using the distorted-wave impulse approximation. A one-step reaction mechanism, in which adoorway state is populated owing to a hyperon mixing, has been investigated. The result shows that these spectra provide valuable information on properties of the 〓Ν－ΛΛ andΣΝ－ΛΝcoupling interactions in a comparison with the forthcoming J-PARC facilities, and it is strongly related to understanding of the inner structure of neutron stars.