Gamma-ray spectroscopy of single -hypernuclei at J-PARC; Results and perspective

シングルハイパー核のガンマ線分光; 結果と見通し

小池 武志*; 長谷川 勝一   ; 早川 修平*; 細見 健二  ; 市川 裕大   ; 今井 憲一; 佐甲 博之   ; 佐藤 進  ; 杉村 仁志; 田村 裕和; 谷田 聖   ; 山本 剛史*; 他45名*

Koike, Takeshi*; Hasegawa, Shoichi; Hayakawa, Shuhei*; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; Tamura, Hirokazu; Tanida, Kiyoshi; Yamamoto, Takeshi*; 45 of others*

Experimental results from the J-PARC E13 experiments are summarized. A new experimental set up of E13 has established a platform for the future -ray hypernuclear spectroscopy at J-PARC using kaon beams. New rays are identified in He and F. The energy of 1.406 MeV for the He transition confirmed a sizable effect of Charge Symmetry Breaking (CSB) in interaction in the hypernuclear system. The identification of four rays in F is made for the first time in shell hypernuclei. Especially, energy spacing of the ground state doublet is found to be 315.5 keV. A good agreement with two theoretical calculations suggests that the theoretical formalism used in shell hypernuclei is also applicable to heavier hypernuclei. Lastly, an overview of the future J-PARC E63 experiment is given.