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Nuclear emulsion, a tracking detector with sub-micron position resolution,has played a successful role in the field of particle physics and the analysisspeed has been substantially improved by the development of automated scanningsystems. This paper describes a newly developed automated scanning system andits application to the analysis of nuclear fragments emitted almostisotropically in nuclear evaporation. This system is able to recognize tracksof nuclear fragments up to |tan{\theta}|< 3.0 (where {\theta} is the trackangle with respect to the perpendicular to the emulsion film), while existingsystems have an angular acceptance limited to |tan{\theta}|< 0.6. The automaticscanning for such a large angle track in nuclear emulsion is the first trial.Furthermore the track recognition algorithm is performed by a powerful GraphicsProcessing Unit (GPU) for the first time. This GPU has a sufficient computingpower to process large area scanning data with a wide angular acceptance andenough flexibility to allow the tuning of the recognition algorithm. This newsystem will in particular be applied in the framework of the OPERA experiment :the background in the sample of tau decay candidates due to hadronicinteractions will be reduced by a better detection of the emitted nuclearfragments.

Automatic scanning of nuclear emulsions with wide-angle acceptance for nuclear fragment detection