EPJ Web of Conferences (Jan 2022)

Results of the 𝚵− atomic X-ray measurement in J-PARC E07

  • Fujita Manami,
  • Ishikawa Y.,
  • Ukai M.,
  • Kanauchi H.,
  • Koike T.,
  • Tamura H.,
  • Hosomi K.,
  • Yamamoto T.O.,
  • Ekawa H.,
  • Hayakawa S.H.,
  • Nakazawa K.,
  • Yoshida J.,
  • Yoshimoto M.,
  • Kasagi A.,
  • Nishimura N.,
  • Hayashi K.

DOI
https://doi.org/10.1051/epjconf/202227103005
Journal volume & issue
Vol. 271
p. 03005

Abstract

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Ξ− atomic X-ray spectroscopy is one of the most useful methods for investigation of the Ξ-nucleus strong interaction. A serious problem in the measurement is the significant background coming from in-flight Ξ− decay. For the first Ξ− atomic X-ray spectroscopy experiment, a novel method of identifying stopped Ξ− events using nuclear emulsion was developed to reject background photons from in-flight Ξ− decay. We succeeded in reducing the background to 1/170 by this method employing coincidence measurements using the nuclear emulsion and X-ray detectors.