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Development of Superconducting Tunnel Junction Detector Using Hafnium for COBAND Experiment

  • Kenichi Takemasa
  • Shinhong Kim
  • Yuji Takeuchi
  • Kazuki Nagata
  • Kota Kasahara
  • Shunsuke Yagi
  • Rena Wakasa
  • Chisa Asano
  • Youiti Ootuka
  • Satoru Mima
  • Kenji Kiuchi
  • Yasuo Arai
  • Ikuo Kurachi
  • Masashi Hazumi
  • Hirokazu Ishino
  • Atsuko Kibayashi
  • Takuo Yoshida
  • Makoto Sakai
  • Takahiro Nakamura
  • Yukihiro Kato
  • Shuji Matsuura
  • Shoji Kawahito
  • Hirokazu Ikeda
  • Takehiko Wada
  • Koichi Nagase
  • Shunsuke Baba
  • Shigetomo Shiki
  • Masahiro Ukibe
  • Go Fujii
  • Masataka Ohkubo
  • Erik Ramberg
  • Mark Kozlovsky
  • Paul Rubinov
  • Jonghee Yoo
  • Domitri A. Sergatskov
  • Soo-Bong Kim
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 213)

Abstract

We present the development of a Superconducting Tunnel Junction detector using hafnium (Hf-STJ) as a far infrared single photon detector for COsmic BAckground Neutrino Decay search (COBAND) experiment. The photon energy spectrum from the decay of cosmic background neutrino is expected to have a sharp edge at the high energy end in a far-infrared region ranging from 14–25 meV in the cosmic infrared background and the overwhelming infrared foreground from the zodiacal emission. We are developing a Hf-STJ which is expected to have 2% energy resolution for a single photon of 25 meV. We have successfully produced a superconductor-insulator-superconductor structure using Hf. However, it is found to suffer from a large leakage current and needs modification of the Hf-STJ to reduce it. We have developed two new types of Hf-STJ: Hf-STJ with an Al layer and Hf-STJ with a new sputtering condition. The leakage current density of two new types of Hf-STJ becomes 16 times smaller than the old Hf-STJ and obtained a response to the visible light. Because of its large leakage current, further optimization is underway.

Keywords

Neutrino decay Superconducting tunnel junction Hafnium 

Notes

Acknowledgements

This work was supported by the Ministry of Education, Science, Sports and Culture of Japan (MEXT KAKENHI Grant Number 25105007). We also thank KEK Detector Technology Project for supporting us in development of STJs at KEK.

References

  1. 1.
    Kim, S.H., Takemasa, K., Takeuchi, Y., Matuura, S.: J. Phys. Soc. Jpn. 81, 024101S (2012)Google Scholar
  2. 2.
    Kim, S.H., et al.: JPS Conf. Proc. 1, 013127 (2014)Google Scholar
  3. 3.
    Lerch, P., Zehnder, A.: Topics Appl. Phys. 99, 217–267 (2005)Google Scholar
  4. 4.
    Kim, S.H., et al.: Phys. Procedia 37, 667–674 (2012). Proceedings of TIPP 2011Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd.  2018

Authors and Affiliations

  • Kenichi Takemasa
    • 1
  • Shinhong Kim
    • 1
  • Yuji Takeuchi
    • 1
  • Kazuki Nagata
    • 1
  • Kota Kasahara
    • 1
  • Shunsuke Yagi
    • 1
  • Rena Wakasa
    • 1
  • Chisa Asano
    • 1
  • Youiti Ootuka
    • 1
  • Satoru Mima
    • 2
  • Kenji Kiuchi
    • 2
  • Yasuo Arai
    • 3
  • Ikuo Kurachi
    • 3
  • Masashi Hazumi
    • 3
  • Hirokazu Ishino
    • 4
  • Atsuko Kibayashi
    • 4
  • Takuo Yoshida
    • 5
  • Makoto Sakai
    • 5
  • Takahiro Nakamura
    • 5
  • Yukihiro Kato
    • 6
  • Shuji Matsuura
    • 7
  • Shoji Kawahito
    • 8
  • Hirokazu Ikeda
    • 9
  • Takehiko Wada
    • 9
  • Koichi Nagase
    • 9
  • Shunsuke Baba
    • 9
  • Shigetomo Shiki
    • 10
  • Masahiro Ukibe
    • 10
  • Go Fujii
    • 10
  • Masataka Ohkubo
    • 10
  • Erik Ramberg
    • 11
  • Mark Kozlovsky
    • 11
  • Paul Rubinov
    • 11
  • Jonghee Yoo
    • 11
  • Domitri A. Sergatskov
    • 11
  • Soo-Bong Kim
    • 12
  1. 1.University of TsukubaTsukubaJapan
  2. 2.RIKENWakoJapan
  3. 3.KEKOho, TsukubaJapan
  4. 4.Okayama UniversityOkayamaJapan
  5. 5.University of FukuiBunkyo, FukuiJapan
  6. 6.Kindai UniversityHigashiosakaJapan
  7. 7.Kwansei Gakuin UniversityGakuen, MitaJapan
  8. 8.Shizuoka UniversityHamamatsuJapan
  9. 9.JAXASagamihara-shiJapan
  10. 10.AISTUmezono, TsukubaJapan
  11. 11.FermilabBataviaUSA
  12. 12.Seoul National UniversitySeoulKorea

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