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

被引：44

作者：

Kim, G. B. ^{[1
,2
]}

Choi, J. H. ^{[1
,2
]}

Jo, H. S. ^{[1
]}

Kang, C. S. ^{[1
,2
]}

Kim, H. L. ^{[1
]}

Kim, I. ^{[1
,2
]}

Kim, S. R. ^{[1
,2
]}

Kim, Y. H. ^{[1
,2
]}

Lee, C. ^{[1
]}

Lee, H. J. ^{[1
,2
]}

Lee, M. K. ^{[2
]}

Li, J. ^{[1
]}

Oh, S. Y. ^{[1
,2
]}

So, J. H. ^{[1
,2
]}

机构：

[1] Inst for Basic Sci Korea, Ctr Underground Phys, Daejeon 34047, South Korea

[2] KRISS, Daejeon 34113, South Korea

来源：

ASTROPARTICLE PHYSICS | 2017年 / 91卷

基金：

新加坡国家研究基金会;

关键词：

Neutrino; Double beta decay; Metallic magnetic calorimeter; Low background;

D O I：

10.1016/j.astropartphys.2017.02.009

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We developed a cryogenic phonon-scintillation detector to search for O nu beta beta decay of Mo-100. The detector module, a proto-type setup of the AMoRE experiment, has a scintillating (CaMoO4)-Ca-40-Mo-100 absorber composed of Mo-100-enriched and Ca-48-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 (CaMoO4)-Ca-40-Mo-100 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 20 sigma separation. Moreover, we discussed how the signal rise-time improves the rejection efficiency for random coincidence signals. (C) 2017 The Author(s). Published by Elsevier B.V.

引用

页码：105 / 112

页数：8

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