atomic X-ray spectroscopy using a counter-emulsion hybrid method
藤田 真奈美; 長谷川 勝一 ; 細見 健二 ; 市川 真也; 市川 裕大 ; Kim, S.; 七村 拓野; 佐甲 博之 ; 田村 裕和; 山本 剛史 ; 他32名*
Fujita, Manami; Hasegawa, Shoichi; Hosomi, Kenji; Ichikawa, Masaya; Ichikawa, Yudai; Kim, S.; Nanamura, Takuya; Sako, Hiroyuki; Tamura, Hirokazu; Yamamoto, Takeshi; 32 of others*
atomic X-ray spectroscopy is one of the most useful methods for investigation of the -nucleus strong interaction. Since the X-ray energy is shifted and/or broadened due to the -nucleus strong interaction compared to those calculated from electromagnetic interaction alone, the measurement of the energy shift, E, and the width, , give us information on the -nucleus potential. A serious problem in the measurement is the significant background derived from in-flight decay. A novel method of identifying stopped events using the nuclear emulsion was developed to realize the first atomic X-ray spectroscopy experiment as the J-PARC E07 experiment, which also aimed at searching for and hypernuclei in the emulsion. The X-rays emitted from Br and 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.