Abstract
Nuclear emulsion is a extremely high-resolution 3D tracking detector. Since the discovery of the pion by C.F. Powell et al. in 1946, experiments with nuclear emulsions have contributed to the development of particle physics. (e.g. the OPERA collaboration reported the discovery of νμ * ντ oscillations in appearance mode in 2015) The technology of nuclear emulsion still keeps making progress. Since 2010, we have introduced a system of nuclear emulsion gel production to our laboratory in Nagoya University, and have started self-development of the new gel, instead of from the photographic film companies. Moreover, a faster automated emulsion scanning system is developed. Its scanning speed reaches 4000 cm2 /h, and the load for analyzing becomes more and more lighter. In this presentation, we report the status of nuclear emulsion technologies for cosmic ray experiments.
Highlights
Nuclear emulsion is an ultra high-precision positionsensitive detector
Since 2010, we have introduced a system of nuclear emulsion gel production to our laboratory in Nagoya University, and have started self-development of the new gel, instead of from the photographic film companies
We report the status of nuclear emulsion technologies for cosmic ray experiments
Summary
Nuclear emulsion is an ultra high-precision positionsensitive detector. It consists of mostly gelatin and crystals of silver bromide (AgBr). Typical electronic trackers consist of readout channels in two or more independent projections for 3D reconstruction, nuclear emulsion directly gives 3D position information of the trajectory. S. Kinoshita discovered that the radiation of alpha decay is a “track” of a charged particle by the observation of nuclear emulsion in 1915 [1]. Powell and his colleagues discovered the decay chain of π → μ + ν in nuclear emulsions exposed to cosmic rays [2]. Double-side poured nuclear emulsion plate realizes a precise measurement of incident angle. ECCs mounted on balloons or airplanes enabled to measure angles of jet particles from high-energy cosmicray interactions. We report the recent improvements of the nuclear emulsion technology since 2010
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