Nagaya Okada

Publications (13)5.7 Total impact

• Source

  Available from: Hiromi Shibata

  Dataset: 121Takechi2009[Detection of high-energy heavy ions using piezoelectric lead zirconate titanate]

  Seiji Takechi, Shin-ya Morinaga, Atsuma Kurozumi, Takashi Miyachi, Masayuki Fujii, Nobuyuki Hasebe, Hiromi Shibata, Takeshi Murakami, Yukio Uchihori, Nagaya Okada
• Source

  Available from: Hiromi Shibata

  Article: Study of the characteristics of a piezoelectric lead zirconate titanate radiation detector using a pulsed xenon source

  Takashi Miyachi, Masayuki Fujii, Nobuyuki Hasebe, Osamu Okudaira, Seiji Takechi, Atsuma Kurozumi, Shinya Morinaga, Takefumi Uno, Hiromi Shibata, Masanori Kobayashi, Takeshi Murakami, Yukio Uchihori, Nagaya Okada
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  ABSTRACT: The detector characteristics of piezoelectric lead zirconate titanate (PZT) were studied by directly irradiating a multilayered PZT detector with 400 MeV/n xenon ions. An extracted beam was processed with a rotating slit. Thus, passed through ∼10³ xenon ions were available for 50 to 250 μ s . The effect of polarization on the output signal was discussed, and the optimal electrode configuration was determined. The output signal appeared as an isolated pulse whose amplitude was qualitatively understood by the Bethe–Bloch formula. However, the calculated and the observed values differed depending on the rotation speed of the slit. A process that can explain the differences is presented here. The output signal appearing beyond the range of 400 MeV/n xenon ion beam was discussed. The sensitivity was compared with that obtained with hypervelocity collision of dust.
  Journal of Applied Physics 06/2010; · 2.17 Impact Factor
• Source

  Available from: Hiromi Shibata

  Article: Detection of high-energy heavy ions using piezoelectric lead zirconate titanate

  Seiji Takechi, Shin-ya Morinaga, Atsuma Kurozumi, Takashi Miyachi, Masayuki Fujii, Nobuyuki Hasebe, Hiromi Shibata, Takeshi Murakami, Yukio Uchihori, Nagaya Okada
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  ABSTRACT: The characteristics of a radiation detector fabricated with stacks of piezoelectric lead zirconate titanate (PZT) elements were studied by irradiating it with a 400 MeV /n xenon (Xe) beam for various beam pulse durations. This detector is referred to as the multilayered detector (MD). To understand the production mechanism behind the output voltage obtained from the MD, measurement of the spatial distribution of the output signals generated in the MD was attempted. It was found that the amplitude observed was dependent on the number of Xe ions per unit time and the amount of ionization loss energy of Xe ions in PZT.
  Journal of Applied Physics 05/2009; · 2.17 Impact Factor
• Source

  Available from: Hiromi Shibata

  Article: Measurement of incident position of hypervelocity particles on piezoelectric lead zirconate titanate detector

  Seiji Takechi, Toshiyuki Onishi, Shigeyuki Minami, Takashi Miyachi, Masayuki Fujii, Nobuyuki Hasebe, Ken-ichi Nogami, Hideo Ohashi, Sho Sasaki, Hiromi Shibata, Takeo Iwai, Eberhard Grun, Ralf Srama, Nagaya Okada
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  ABSTRACT: A cosmic dust detector for use onboard a satellite is currently being developed by using piezoelectric lead zirconate titanate (PZT). The characteristics of the PZT detector have been studied by bombarding it with hypervelocity iron (Fe) particles supplied by a Van de Graaff accelerator. One central electrode and four peripheral electrodes were placed on the front surface of the PZT detector to measure the impact positions of the incident Fe particles. It was demonstrated that the point of impact on the PZT detector could be identified by using information on the time at which the first peak of the output signal obtained from each electrode appeared.
  Review of Scientific Instruments 05/2008; · 1.37 Impact Factor
• Article: Radiation detector based on piezoelectric lead zirconate titanate material

  Seiji Takechi, Takashi Miyachi, Masayuki Fujii, Nobuyuki Hasebe, Kunishiro Mori, Hiromi Shibata, Takeshi Murakami, Yukio Uchihori, Nagaya Okada
• Article: Position Sensitive Element for Hypervelocity Microparticles Using a Piezoelectric Plate

  Takashi Miyachi, Genei Kuraza, Atsushi Nagashima, Masayuki Fujii, Nobuyuki Hasebe, Naoyuki Yamashita, Ken-ichi Nogami, Takeo Iwai, Hideo Ohashi, Hiromi Shibata, Shigeyuki Minami, Seiji Takechi, Toshiyuki Onishi, Eberhard Gruen, Ralf Srama, Nagaya Okada
• Article: Measurement of temperature after hypervelocity collision of microparticles in the range from 10 to 40 km/s

  Takashi Miyachi, Masayuki Fujii, Nobuyuki Hasebe, Mitsuhiro Miyajima, Osamu Okudaira, Seiji Takechi, Toshiyuki Onishi, Shigeyuki Minami, Hiromi Shibata, Hideo Ohashi, Takeo Iwai, Ken-ichi Nogami, Sho Sasaki, Eberhard Gruen, Ralf Srama, Nagaya Okada
• Article: Evaluation of piezoelectric lead-zirconate-titanate multilayered detector by Fourier analysis

  Seiji Takechi, Toshiyuki Onishi, Shigeyuki Minami, Takashi Miyachi, Masayuki Fujii, Nobuyuki Hasebe, Kunishiro Mori, Hiromi Shibata, Takeshi Murakami, Yukio Uchihori, Nagaya Okada
• Article: Comparison between two piezoelectric lead-zirconate-titanate detectors bombarded with high-energy xenon beam

  Seiji Takechi, Toshiyuki Onishi, Shigeyuki Minami, Takashi Miyachi, Masayuki Fuji, Nobuyuki Hasebe, Kunishiro Mori, Hiromi Shibata, Takeshi Murakami, Yukio Uchihori, Nagaya Okada
• Article: Detection of acoustic wave excited in chloroform bombarded with high-energy xenon beam

  Seiji Takechi, Toshiyuki Onishi, Shigeyuki Minami, Takashi Miyachi, Masayuki Fujii, Nobuyuki Hasebe, Kunishiro Mori, Hiromi Shibata, Takeshi Murakami, Yukio Uchihori, Nagaya Okada
• Article: Characteristics of piezoelectric lead zirconate titanate fourteen-layered detector bombarded with high-energy xenon beam

  Seiji Takechi, Takashi Miyachi, Masayuki Fujii, Nobuyuki Hasebe, Kunishiro Mori, Hiromi Shibata, Takeshi Murakami, Yukio Uchihori, Nagaya Okada
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  ABSTRACT: A radiation detector composed of fourteen lead zirconate titanate (PZT) disks was studied by directly irradiating it using a 400 MeV/n xenon beam while changing the beam intensity and beam pulse duration. The results obtained indicated that the sensitivity of the detector per xenon ion was explicitly dependent on the beam pulse duration. Comparing the sensitivity among PZT detectors with one, fourteen and one hundred layers, it was also found that the sensitivity of the fourteen-layered detector was highest under the experimental conditions.
  Sensors and Actuators A: Physical.
• Article: Behaviour of piezoelectric lead zirconate titanate irradiating with high-energy xenon ions

  Seiji Takechi, Shin-ya Morinaga, Atsuma Kurozumi, Takashi Miyachi, Masayuki Fujii, Nobuyuki Hasebe, Hiromi Shibata, Takeshi Murakami, Yukio Uchihori, Nagaya Okada
• Article: Dependence of Thickness of Lead Zirconate Titanate Material Used as Radiation Detector

  Seiji Takechi, Shin-ya Morinaga, Atsuma Kurozumi, Takashi Miyachi, Masayuki Fujii, Nobuyuki Hasebe, Hiromi Shibata, Takeshi Murakami, Yukio Uchihori, Nagaya Okada