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Light collection of some molybdate crystal absorbers for cryogenic calorimeters at millikelvin temperatures

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Title
Light collection of some molybdate crystal absorbers for cryogenic calorimeters at millikelvin temperatures
Author(s)
B. Mailyan; B. Sharma; Kim, H.J.; Seung Cheon Kim; W.T. Kim; Yeongduk Kim; Yong Hamb Kim; Moo Hyun Lee; Kyungrae Woo
Publication Date
2023-07
Journal
IEEE Transactions on Nuclear Science, v.70, no.7, pp.1307 - 1311
Publisher
Institute of Electrical and Electronics Engineers Inc.
Abstract
Scintillating molybdate crystals recently got significant attention for their applications in rare event searches, such as neutrinoless double beta decay experiments. In this paper, we report on the light collection of cryogenic calorimeters operating at 10 mK, using CaMoO<sub>4</sub> (CMO), Li<sub>2</sub>100MoO<sub>4</sub> (LMO), and Na<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub> (NMO) crystal absorbers. Scintillation signals from gamma rays and alpha particles are studied. Germanium (Ge) and Silicon (Si) wafers, which work as light absorbers, coupled to Metallic Magnetic Calorimeters (MMC), are used as scintillation light detectors. By comparing the scintillation signals with &#x201C;direct hit&#x201D; X-ray signals of known energies, which occurred in the light absorber, we assess the light collection of the crystal scintillation. 8 keV copper X-rays are analyzed in the case of both the Ge and Si wafer detectors. The light measurement with LMO and NMO crystals at millikelvin temperatures is 9.6 and 7.6 times less compared with the CMO for 2.615 MeV gamma rays from 208Tl. Additionally, we found that for NMO, the detected scintillation light for alpha particles is quenched by a factor of 0.06 compared to that of gamma rays for a given energy by investigating the light signal from 2.615 MeV gamma rays and 5.4 MeV alpha particles. For the CMO, in the same way, the quenching factor is measured to be 0.22. The quenching factor for 4.785 MeV alpha particles (6Li neutron capture) in LMO crystal is about 0.28 compared to the scintillation from 2.615 MeV gamma rays. IEEE
URI
https://pr.ibs.re.kr/handle/8788114/14240
DOI
10.1109/TNS.2023.3267387
ISSN
0018-9499
Appears in Collections:
Center for Underground Physics(지하실험 연구단) > 1. Journal Papers (저널논문)
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