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Novel measurement method of heat and light detection for neutrinoless double beta decay

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Title
Novel measurement method of heat and light detection for neutrinoless double beta decay
Author(s)
G.B. Kim; J.H. Choi; H.S. Jo; C.S. Kang; H.L. Kim; I. Kim; S.R. Kim; Y.H. Kim; C. Lee; H.J. Lee; M.K. Lee; J. Li; S.Y. Oh; J.H. So
Publication Date
2017-05
Journal
ASTROPARTICLE PHYSICS, v.91, no., pp.105 - 112
Publisher
ELSEVIER SCIENCE BV
Abstract
We developed a cryogenic phonon-scintillation detector to search for 0νββ decay of 100Mo. The detector module, a proto-type setup of the AMoRE experiment, has a scintillating 40Ca100MoO4 absorber composed of 100Mo-enriched and 48Ca-depleted elements. This new detection method employs metallic magnetic calorimeters (MMCs) as the sensor technology for simultaneous detection of heat and light signals. It is designed to have high energy and timing resolutions to increase sensitivity to probe the rare event. The detector, which is composed of a 200 g 40Ca100MoO4 crystal and phonon/photon sensors, showed an energy resolution of 8.7 keV FWHM at 2.6 MeV, with a weak temperature dependence in the range of 10-40 mK. Using rise-time and mean-time parameters and light/heat ratios, the proposed method showed a strong capability of rejecting alpha-induced events from electron events with as good as 20σ separation. Moreover, we discussed how the signal rise-time improves the rejection efficiency for random coincidence signals. © 2017 The Author(s).Published by Elsevier B.V.
URI
https://pr.ibs.re.kr/handle/8788114/4215
ISSN
0927-6505
Appears in Collections:
Center for Underground Physics(지하실험 연구단) > Journal Papers (저널논문)
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