Improvement of Mass Resolution for Iron Isotopes in CR-39 Track Detector

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概要

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• The capability of the CR-39 track detector for isotope identification was verified using 56Fe and 55Fe beams from the heavy ion accelerator HIMAC at NIRS. A CR-39 stack was exposed to 56Fe and 55Fe beams with the energies of 460 MeV/nucleon. Drastic improvements in the accuracies of microscopic image analysis and detector thickness measurement enabled us to identify those iron isotopes with high mass resolution using the CR-39 track detector. As a consequence of the reduction of systematic errors, the mass resolution for iron isotopes in the CR-39 detector was obtained to be $0.22\pm 0.03$ amu in rms. The mass resolution newly obtained by the CR-39 detector was compared with the former result and found to be 66% better than the former value of mass resolution as a result of reducing the systematic errors of mass dispersion. Moreover, the ultimate mass resolution of the CR-39 detector was estimated by calculation using those experimental results. As a consequence of reducing the random error, it is expected that the mass resolution for iron isotopes can ultimately approach to ${\sim}0.10$ amu in the CR-39 detector.

• 2007-08-15

著者

• YASUDA Nakahiro

  National Institute of Radiological Sciences

• TAWARA Hiroko

  High Energy Accelerator Research Organization

• KODAIRA Satoshi

  Research Institute for Science and Engineering, Waseda Univ.

• Ota Shuya

  Research Institute For Science And Engineering Waseda University

• Ogura Koichi

  College Of Industrial Technology Nihon University

• Hasebe Nobuyuki

  Research Institute for Science and Engineering of Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan

• Ota Shuya

  Research Institute for Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555, Japan

• Doke Tadayoshi

  Research Institute for Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555, Japan

• Ogura Koichi

  College of Industrial Technology, Nihon University, Narashino, Chiba 275-8576, Japan

• Sato Masashi

  Research Institute for Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555, Japan

• Tawara Hiroko

  High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan

• Yasuda Nakahiro

  National Institute of Radiological Sciences, Inage, Chiba 263-8555, Japan

• Yasuda Nakahiro

  National Institute of Radiological Science, Chiba 263-8555, Japan

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