Scanning system and image process for double-lambda hypernucleus searching in nuclear emulsion

ORAL

Abstract

A new method named ``Overall scanning'' is being developed to search for more events of double --lambda hypernucleus in nuclear emulsion. A computer-controlled optical microscope scans full volume of emulsion layers exhaustively and a high-speed, high-resolution camera takes their sequential microscopic images. Then, an image process picks out ``double--lambda hypernucleus--like shapes'' having multi tracks and 3 vertices stem from production and cascade weak decay of double--lambda hypernucleus. In this talk, I'll present the current status of development and its operation. During test operations by E373's emulsion plates, about 20cc volume of emulsion was scanned so far. It equals a half of an E373's emulsion plate. Some candidates of double-$\Lambda $ hypernuclei and twin single-lambda hypernucleus have been detected. Besides, 10$^3$ single-lambda hypernucleus and 10$^3$ alpha decays were found, which is calibration samples for range-energy relation.

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Authors

  • Yoshida Junya

    • Gifu University, Japan
    • Gifu University

  • Kazuma Nakazawa

    • Gifu University, Japan

  • Khin Than Tint

    • Gifu University, Japan

  • Myint Kyaw Soe

    • Gifu University, Japan

  • Shinji Kinbara

    • Gifu University, Japan

  • Akihiro Mishina

    • Gifu University, Japan

  • Yoko Endo

    • Gifu University, Japan

  • Hiroki Ito

    • Gifu University, Japan

  • Hidetaka Kobayashi

    • Gifu University, Japan