Automatic analysis of the emulsion chamber using the image scanner applied to the Tibet hybrid experiment

Shunsuke Ozawa*, M. Shibata, Y. Katayose, I. Ohta, N. Hotta, T. Saito, X. Wang, T. Ouchi, J. Huang, H. Tsuchiya, J. R. Ren, S. L. Lu, N. J. Zhang, J. Y. Li, X. Y. Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


A new method of emulsion chamber analysis by using an image scanner is developed in order to process a large number of X-ray films used in the Tibet hybrid experiment which is carried out to observe primary proton spectrum in the PeV region. The experimental procedure in this method consists of multiple steps of processing the image of the X-ray films, i.e. the detection of cascade showers induced by high-energy γ-rays, the noise reduction, the spatial reconstruction of γ-families and their energy determination. The quality of the results obtained by the new method is compared with that obtained by the current manual method or Monte Carlo simulations. It is shown that sufficiently high quality of the emulsion chamber analysis is realized by the automatic method both in energy and geometrical resolution.

Original languageEnglish
Pages (from-to)193-205
Number of pages13
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-2
Publication statusPublished - 2004 May 1
Externally publishedYes


  • Automatic analysis
  • Chemical composition of primary cosmic rays
  • Cosmic rays
  • Emulsion chambers

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics


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