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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; et al.
Physical Review Letters, 115(22), p.222501_1 - 222501_5, 2015/11
被引用回数:65 パーセンタイル:92.69(Physics, Multidisciplinary)The energy spacing between the spin-doublet bound state of He was determined to be keV, by measuring rays for the transition with a high efficiency germanium detector array in coincidence with the He reaction at J-PARC. In comparison to the corresponding energy spacing in the mirror hypernucleus H, the present result clearly indicates the existence of charge symmetry breaking (CSB) in 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 ground state but is vanishingly small in the excited state, demonstrating that the CSB interaction has spin dependence.
山本 剛史*; 江川 弘行; 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; et al.
JPS Conference Proceedings (Internet), 8, p.021017_1 - 021017_6, 2015/09
A -ray spectroscopy experiment via the reaction (J-PARC E13-1st) will be performed at the J-PARC Hadron Experimental Facility using a newly developed Ge detector array, Hyperball-J. Spin-dependent interactions will be studied through the precise measurement of the structure of hypernuclei, He and F. In May 2013, commissioning of whole detector system was carried out and calibration data were taken. In particular, production cross sections of and C via the reaction on the CH target for and 1.8 GeV/ were obtained.