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

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High quality Nb-based tunnel junctions with surface areas of 100×100μm<SUP>2</SUP> and 200×200μm<SUP>2</SUP> were tested by irradiating X-rays. According to the decrease in the disappearance of quasiparticles before tunneling, the 200×200μm<SUP>2</SUP> junction exhibited better X-ray response than that of 100×100μm<SUP>2</SUP> one. In the operation of the 200×200μm<SUP>2</SUP> 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 200G/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 <SUP>55</SUP>Mn with an energy resolution (FWHM) of 93eV. The 200×200μm<SUP>2</SUP> junction has the largest dimension among tunnel junctions exceeding silicon-semiconductor detectors in energy resolution.

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  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 34(10), 979-982, 1997-10-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002078251
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00223131
  • NDL 記事登録ID
    4326331
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z53-A460
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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