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Observation of spin-dependent charge symmetry breaking in $$Lambda N$$ interaction; $$gamma$$-ray spectroscopy of $$^4_{Lambda}$$He

$$Lambda N$$相互作用におけるスピンに依存する荷電対称性の破れの観測; $$^4_{Lambda}$$Heの$$gamma$$線分光

山本 剛史*; 長谷川 勝一; 早川 修平; 細見 健二; Hwang, S.; 市川 裕大; 今井 憲一; 金原 慎二; 中田 祥之; 佐甲 博之; 佐藤 進; 杉村 仁志; 谷田 聖; J-PARC E13 Collaboration*; 他41名*

Yamamoto, T. O.*; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Hwang, S.; Ichikawa, Yudai; Imai, Kenichi; Kimbara, Shinji; Nakada, Yoshiyuki; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; Tanida, Kiyoshi; J-PARC E13 Collaboration*; 41 of others*

The energy spacing between the spin-doublet bound state of $$^4_{Lambda}$$He$$(1^+,0^+)$$ was determined to be $$1406 pm 2 pm 2$$ keV, by measuring $$gamma$$ rays for the $$1^+ to 0^+$$ transition with a high efficiency germanium detector array in coincidence with the $$^4{rm He}(K^-,pi^-)^4_{Lambda}$$He reaction at J-PARC. In comparison to the corresponding energy spacing in the mirror hypernucleus $$^4_{Lambda}$$H, the present result clearly indicates the existence of charge symmetry breaking (CSB) in $$Lambda N$$ interaction. By combining the energy spacings with the known ground-state binding energies, it is also found that the CSB effect is large in the $$0^+$$ ground state but is vanishingly small in the $$1^+$$ excited state, demonstrating that the $$Lambda N$$ CSB interaction has spin dependence.

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パーセンタイル:9.43

分野:Physics, Multidisciplinary

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