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Observation of Coulomb-assisted nuclear bound state of $$Xi^-$$-$$^{14}$$N system

$$Xi^-$$-$$^{14}$$N系におけるクーロン補助束縛状態の観測

早川 修平; 藤田 真奈美; 長谷川 勝一  ; 橋本 直  ; 細見 健二 ; 市川 裕大 ; 今井 憲一*; 七村 拓野; 成木 恵; 佐甲 博之  ; 佐藤 進 ; 田村 裕和; 谷田 聖  ; 山本 剛史 ; 他84名*

Hayakawa, Shuhei; Fujita, Manami; Hasegawa, Shoichi; Hashimoto, Tadashi; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi*; Nanamura, Takuya; Naruki, Megumi; Sako, Hiroyuki; Sato, Susumu; Tamura, Hirokazu; Tanida, Kiyoshi; Yamamoto, Takeshi; 84 of others*

In an emulsion-counter hybrid experiment performed at J-PARC, a $$Xi^-$$ absorption event was observed which decayed into twin single-$$Lambda$$ hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as $$Xi^{-} + ^{14}$$N$$ rightarrow ^{10}_Lambda$$Be + $$^5_Lambda$$He. For the binding energy of the $$Xi^{-}$$ hyperon in the $$Xi^-$$-$$^{14}$$N system a value of $$1.27 pm 0.21$$ MeV was deduced. The energy level of $$Xi^-$$ is likely a nuclear $$1p$$ state which indicates a weak $${Xi}N$$-$$LambdaLambda$$ coupling.

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分野:Physics, Multidisciplinary

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