First -ray spectroscopy of an -shell hypernucleus, F

初のシェル核、Fの線分光

Yang, S. B.*; 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  ; 田村 裕和*; 谷田 聖   ; 山本 剛史  ; 他37名*

Yang, S. B.*; Hasegawa, Shoichi; Hayakawa, Shuhei*; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Tamura, Hirokazu*; Tanida, Kiyoshi; Yamamoto, Takeshi; 37 of others*

We performed a gamma-ray spectroscopy of at J-PARC Hadron Experimental Facility in 2015. It is the first measurement of rays emitted from -shell hypernuclei. In this experiment, we determined the energy spacing between the ground state spin doublet, and states, as 316 keV. The excitation energies of and states are also determined to be 895 and 1266 keV, respectively. The energy spacing is found to be well reproduced by shell-model calculations which describe - and -shell hypernuclei well. The results show that the present theories of the interaction describe not only the light hypernuclei but also a heavier hypernucleus.