Detection and analysis of tau-neutrino interactions in DONUT emulsion target

K. Kodama, N. Saoulidou, G. Tzanakos, B. Baller, B. Lundberg, R. Rameika, J. S. Song, C. S. Yoon, S. H. Chung, S. Aoki, T. Hara, C. Erickson, K. Heller, R. Schwienhorst, J. Sielaff, J. Trammell, K. Hoshino, H. Jiko, J. Kawada, T. KawaiM. Komatsu, H. Matsuoka, M. Miyanishi, M. Nakamura, T. Nakano, K. Narita, K. Niwa, N. Nonaka, K. Okada, O. Sato, T. Toshito, V. Paolone, T. Kafka

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


The DONUT experiment used an emulsion/counter-hybrid-detector, which succeeded in detecting tau-neutrino charged-current interactions. A new method of emulsion analysis, NETSCAN, was used to locate neutrino events and detect tau decays. It is based on a fully automated emulsion readout system (Ultra Track Selector) developed at Nagoya University. The achieved plate-to-plate alignment accuracy of ∼0.2 μm over an area of 2.6 mm×2.6 mm permitted an efficient and systematic tau decay search using emulsion data. Moreover, this accuracy allowed measurement of particle momenta by multiple Coulomb scattering, and contributed to the efficient background rejection for the ν τ candidates. This paper describes details of our emulsion analysis methods.

Original languageEnglish (US)
Pages (from-to)45-66
Number of pages22
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-2
StatePublished - Nov 1 2002

Bibliographical note

Funding Information:
We would like to thank the support of the staffs of Nagoya University and the collaborating laboratories. We acknowledge the support from the Japan Society for the Promotion of Science, the Japan-US Cooperative Research Program for High Energy Physics, the Ministry of Education, Science and Culture of Japan, the U.S. Department of Energy, the General Secretariat of Research and Technology of Greece, the Korean Research Foundation, and the DOE/OJI Program.


  • Automatic scanning
  • Nuclear emulsion
  • Tau neutrino


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