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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

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arxiv nucl-ex/0609008 v2 pith:HDZJKMKK submitted 2006-09-08 nucl-ex

H. Nakamura , P. Doe , H. Ejiri , S.R. Elliott , J. Engel , M. Finger , M. Finger. Jr , K. Fushimi
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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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keywords detectormulti-layerscintillationbetadoubleenergygoodhigh-sensitivity
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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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