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Multi-layer scintillation detector for the MOON double beta decay experiment: Scintillation photon responses studied by a prototype detector MOON-1

H. Nakamura·P. Doe·H. Ejiri·S. R. Elliott·J. Engel·M. Finger·M. Finger. Jr·K. Fushimi·V. Gehman·A. Gorin·M. Greenfield·V. H. Hai·R. Hazama·K. Higa·T. Higashiguchi·K. Ichihara·Y. Ikegami·J. Imoto·H. Ishii·T. Itahashi·H. Kaneko·P. Kavitov·H. Kawasuso·V. Kekelidze·K. Matsuoka·T. Mizuhashi·D. Noda·M. Nomachi·K. Onishi·T. Ogama·A. Para·R. G. H. Robertson·M. Sakamoto·T. Sakiuchi·Y. Samejima·Y. Shichijo·T. Shima·Y. Shimada·G. Shirkov·A. Sissakian·M. Slunecka·Y. Sugaya·A. Titov·M. Uenoyama·S. Umehara·A. Urano·V. Vatulin·V. Voronov·J. F. Wilkerson·D. I. Will·K. Yasuda·S. Yoshida·M. Yoshihuku
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Abstract

An ensemble of multi-layer scintillators is discussed as an option of the high-sensitivity detector Mo Observatory Of Neutrinos (MOON) for spectroscopic measurements of neutrino-less double beta decays. A prototype detector MOON-1, which consists of 6 layer plastic-scintillator plates, was built to study the sensitivity of the MOON-type detector. The scintillation photon collection and the energy resolution, which are key elements for the high-sensitivity experiments, are found to be 1835+/-30 photo-electrons for 976 keV electrons and sigma = 2.9+/-0.1% (dE/E = 6.8+/-0.3 % in FWHM) at the Qbb ~ 3 MeV region, respectively. The multi-layer plastic-scintillator structure with good energy resolution as well as good background suppression of beta-gamma rays is crucial for the MOON-type detector to achieve the inverted hierarchy neutrino mass sensitivity.

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H. Nakamura, P. Doe, H. Ejiri, S. R. Elliott, J. Engel, M. Finger, M. Finger. Jr, K. Fushimi, V. Gehman, A. Gorin, M. Greenfield, V. H. Hai, R. Hazama, K. Higa, T. Higashiguchi, K. Ichihara, Y. Ikegami, J. Imoto, H. Ishii, T. Itahashi, H. Kaneko, P. Kavitov, H. Kawasuso, V. Kekelidze, K. Matsuoka, T. Mizuhashi, D. Noda, M. Nomachi, K. Onishi, T. Ogama, A. Para, R. G. H. Robertson, M. Sakamoto, T. Sakiuchi, Y. Samejima, Y. Shichijo, T. Shima, Y. Shimada, G. Shirkov, A. Sissakian, M. Slunecka, Y. Sugaya, A. Titov, M. Uenoyama, S. Umehara, A. Urano, V. Vatulin, V. Voronov, J. F. Wilkerson, D. I. Will, K. Yasuda, S. Yoshida, M. Yoshihuku. 2006-09-12. Multi-layer scintillation detector for the MOON double beta decay experiment: Scintillation photon responses studied by a prototype detector MOON-1. https://doi.org/10.1143/jpsj.76.114201

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