The First gamma-ray spectroscopic study of -shell hypernucleus, F

ガンマ線分光による初のシェル核、Fの研究

Yang, S. B.*; 江川 弘行; 長谷川 勝一   ; 早川 修平; 細見 健二  ; Hwang, S.; 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   ; 他34名*

Yang, S. B.*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Hwang, S.; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; Tamura, Hirokazu; Tanida, Kiyoshi; 34 of others*

The first -ray spectroscopy of -shell hypernucleus, F, is performed in June, 2015 at the J-PARC K1.8 beam line (J-PARC E13). Precise energy levels of F can be revealed by measured rays in this experiment. Especially, the strength of spin-spin interaction in -shell hypernucleus is obtained through the energy spacing of the ground-state doublet of the hypernucleus. By comparing its strength between the , , and -shell hypernuclei, a radial dependence interaction is investigated. The hypernucleus is produced through the reaction with the beam momentum of 1.8 GeV/c. In very preliminary results, we observed two rays, and their energies are keV and keV where the uncertainties are only statistical.