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Abstract
To recognize sub-micron-range low-energy tracks recorded in a super-fine-grained nuclear emulsion (Nano Imaging Tracker), an elliptical fitting method was devised to analyze anisotropic images taken by an optical microscope. We report on this newly developed method using a discrete Fourier transform and second-order moment analysis of the brightness distribution. We succeeded in lowering the ellipticity threshold, thereby improving the selection efficiency and angular resolution. Notably, the success of detecting carbon 30 keV tracks is the first such achievement in the world, where the incident direction of carbon 30 keV ions was determined with an accuracy of 41
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1 Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan
2 Toho University, 2-2-1 Miyama, Funabashi, Chiba, 274-8510, Japan; Kobayashi-Maskawa Institute, Nagoya University, Furo-cho, Nagoya, Aichi, 464-8601, Japan
3 Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan; Kobayashi-Maskawa Institute, Nagoya University, Furo-cho, Nagoya, Aichi, 464-8601, Japan
4 Toho University, 2-2-1 Miyama, Funabashi, Chiba, 274-8510, Japan
5 Laboratori Nazionali del Gran Sasso Via G. Acitelli, 22 67100 Assergi L’Aquila, Italy