Development of superconducting tunnel junction detectors as a far-infrared single photon detector for neutrino decay search

Yuji Takeuchi, Shin Hong Kim, Kenichi Takemasa, Kenji Kiuchi, Kazuki Nagata, Kota Kasahara, Takuya Okudaira, Tatsuya Ichimura, Masahiro Kanamaru, Kouya Moriuchi, Ren Senzaki, Hirokazu Ikeda, Shuji Matsuura, Takehiko Wada, Hirokazu Ishino, Atsuko Kibayashi, Satoru Mima, Takuo Yoshida, Shota Komura, Keisuke OrikasaRyuta Hirose, Yukihiro Kato, Masashi Hazumi, Yasuo Arai, Erik Ramberg, Jonghee Yoo, Mark Kozlovsky, Paul Rubinov, Dmitri Sergatskov, Soo Bong Kim

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Abstract

We present the development of Superconducting Tunnel Junction (STJ) detectors as a far-infrared single photon detector motivated by application to a search for the radiative decay of cosmic background neutrino. The photon energy spectrum from the neutrino radiative decays is expected to have a sharp edge at high energy end in a far-infrared region ranging from 14 meV to 25 meV (from 50 μm to 90 μm in wavelength). Thus, the detector is required to measure photon-by-photon energies with sufficiently high resolution to identify the edge structure. Detectors consisting of an array of niobium/aluminum STJ (Nb/Al-STJ) pixels with a diffraction grating and STJ using hafnium (Hf-STJ) are under consideration. Each Nb/Al-STJ pixel is capable of detecting single photons in the far-infrared region. The diffraction grating creates a variation in the photon wavelength across the pixel array. Hf-STJ is expected to have 2% energy resolution for single photon of 25 meV due to very small gap energy of hafnium.

Original languageEnglish
Article number155
JournalProceedings of Science
Publication statusPublished - 2014

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Cite this

Takeuchi, Y., Kim, S. H., Takemasa, K., Kiuchi, K., Nagata, K., Kasahara, K., Okudaira, T., Ichimura, T., Kanamaru, M., Moriuchi, K., Senzaki, R., Ikeda, H., Matsuura, S., Wada, T., Ishino, H., Kibayashi, A., Mima, S., Yoshida, T., Komura, S., ... Kim, S. B. (2014). Development of superconducting tunnel junction detectors as a far-infrared single photon detector for neutrino decay search. Proceedings of Science, [155].