Ξ − atomic X-ray spectroscopy using a counter-emulsion hybrid method. (25th November 2022)

• Record Type: Journal Article
• Authors: 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;
• Is Part Of: Progress of theoretical and experimental physics. Volume 2022:Number 12(2022)
• Publication Date: 2022-11-25
• Subjects: Physics -- Periodicals; Mathematical physics -- Periodicals; 530.05
• DOI: 10.1093/ptep/ptac156
• Languages: English
• ISSNs: 2050-3911

Abstract

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, Δ E, 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.