Response of Large Nb-Based Tunnel Junction to X-Rays

Keisuke Maehata, Shin Ichi Yoshida, Kenji Ishibashi, Hiroshi Nakagawa, Hiroshi Akoh, Koen Joosse, Susumu Takada, Masaki Katagiri, Maki Kishimoto, Masahiro Ukibe

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

High quality Nb-based tunnel junctions with surface areas of 100 x 100 μm2 and 200 x 200 μm2 were tested by irradiating X-rays. According to the decrease in the disappearance of quasiparticles before tunneling, the 200 x 200 μm2 junction exhibited better X-ray response than that of 100 x 100 μm2 one. In the operation of the 200 x 200 μm2 junction, two kinds of stable operation modes with different pulse heights were found by applying a magnetic field with different ramping speeds. The higher pulse height mode was observed with a ramping-speed faster than about 200 G/s. After tuning of the bias current in the higher mode operation, the energy required for single electron collection was obtained to be 6.5meV and the junction detected 5.9keV X-rays of 55Mn with an energy resolution (FWHM) of 93eV. The 200 x 200 μm2 junction has the largest dimension among tunnel junctions exceeding silicon-semiconductor detectors in energy resolution.

Original languageEnglish
Pages (from-to)979-982
Number of pages4
Journaljournal of nuclear science and technology
Volume34
Issue number10
DOIs
Publication statusPublished - Jan 1 1997

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Tunnel junctions
tunnel junctions
X rays
pulse amplitude
Semiconductor detectors
Silicon detectors
x rays
Bias currents
Full width at half maximum
Tuning
Magnetic fields
energy
Electrons
tuning
detectors
silicon
magnetic fields
electrons

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering

Cite this

Maehata, K., Yoshida, S. I., Ishibashi, K., Nakagawa, H., Akoh, H., Joosse, K., ... Ukibe, M. (1997). Response of Large Nb-Based Tunnel Junction to X-Rays. journal of nuclear science and technology, 34(10), 979-982. https://doi.org/10.1080/18811248.1997.9733773

Response of Large Nb-Based Tunnel Junction to X-Rays. / Maehata, Keisuke; Yoshida, Shin Ichi; Ishibashi, Kenji; Nakagawa, Hiroshi; Akoh, Hiroshi; Joosse, Koen; Takada, Susumu; Katagiri, Masaki; Kishimoto, Maki; Ukibe, Masahiro.

In: journal of nuclear science and technology, Vol. 34, No. 10, 01.01.1997, p. 979-982.

Research output: Contribution to journalArticle

Maehata, K, Yoshida, SI, Ishibashi, K, Nakagawa, H, Akoh, H, Joosse, K, Takada, S, Katagiri, M, Kishimoto, M & Ukibe, M 1997, 'Response of Large Nb-Based Tunnel Junction to X-Rays', journal of nuclear science and technology, vol. 34, no. 10, pp. 979-982. https://doi.org/10.1080/18811248.1997.9733773
Maehata, Keisuke ; Yoshida, Shin Ichi ; Ishibashi, Kenji ; Nakagawa, Hiroshi ; Akoh, Hiroshi ; Joosse, Koen ; Takada, Susumu ; Katagiri, Masaki ; Kishimoto, Maki ; Ukibe, Masahiro. / Response of Large Nb-Based Tunnel Junction to X-Rays. In: journal of nuclear science and technology. 1997 ; Vol. 34, No. 10. pp. 979-982.
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