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Fujita, M; Ekawa, H; Endo, Y; Goto, R; Hasegawa, S; Hayakawa, S H; Hayashi, K; Honda, R; Hoshino, K; Hosomi, K; Ichikawa, M; Ichikawa, Y; Ito, H; Ishikawa, Y; Jung, W S; Kasagi, A; Kim, S H; Kinbara, S; Kobayashi, H; Koike, T; Lee, J Y; Lin, P M; Nagase, Y; Nakashima, D; Nakazawa, K; Nanamura, T; Nishimura, N; Nishimura, S; Nyaw, A N L; Ohashi, M; Sako, H; Soe, M K; Tamura, H; Theint, A M M; Tint, K T; Toyama, Y; Ukai, M; Yamamoto, T O; Yang, S B; Yoshida, J; Yoshimoto, M; Zhang, D
Progress of theoretical and experimental physics, 12/2022, Volume: 2022, Issue: 12Journal Article
Abstract Ξ− atomic X-ray spectroscopy is one of the most useful methods for investigation of the Ξ–nucleus strong interaction. Since the X-ray energy is shifted and/or broadened due to the Ξ–nucleus strong interaction compared to those calculated from electromagnetic interaction alone, the measurement of the energy shift, ΔE, and the width, Γ, give us information on the Ξ–nucleus potential. A serious problem in the measurement is the significant background derived from in-flight Ξ− decay. A novel method of identifying stopped Ξ− events using the nuclear emulsion was developed to realize the first Ξ− atomic X-ray spectroscopy experiment as the J-PARC E07 experiment, which also aimed at searching for ΛΛ and Ξ− hypernuclei in the emulsion. The X-rays emitted from Ξ− Br and Ξ− Ag atoms were measured using germanium detectors. No clear peaks were observed in the obtained spectra. However, we succeeded in reducing the background to 1/170 by this method employing coincidence measurements using nuclear emulsion and X-ray detectors.
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