  Nuclear emulsion, a tracking detector with sub-micron position resolution,
has played a successful role in the field of particle physics and the analysis
speed has been substantially improved by the development of automated scanning
systems. This paper describes a newly developed automated scanning system and
its application to the analysis of nuclear fragments emitted almost
isotropically in nuclear evaporation. This system is able to recognize tracks
of nuclear fragments up to |tan{\theta}|< 3.0 (where {\theta} is the track
angle with respect to the perpendicular to the emulsion film), while existing
systems have an angular acceptance limited to |tan{\theta}|< 0.6. The automatic
scanning for such a large angle track in nuclear emulsion is the first trial.
Furthermore the track recognition algorithm is performed by a powerful Graphics
Processing Unit (GPU) for the first time. This GPU has a sufficient computing
power to process large area scanning data with a wide angular acceptance and
enough flexibility to allow the tuning of the recognition algorithm. This new
system will in particular be applied in the framework of the OPERA experiment :
the background in the sample of tau decay candidates due to hadronic
interactions will be reduced by a better detection of the emitted nuclear
fragments.
