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Title: Characterization of light production and transport in tellurium dioxide crystals

Abstract

Simultaneous measurement of phonon and light signatures is an effective way to reduce the backgrounds and increase the sensitivity of CUPID, a next-generation bolometric neutrinoless double-beta decay ($$0\nu\beta\beta$$) experiment. Light emission in tellurium dioxide (TeO$$_2$$) crystals, one of the candidate materials for CUPID, is dominated by faint Cherenkov radiation, and the high refractive index of TeO$$_2$$ complicates light collection. Positive identification of $$0\nu\beta\beta$$ events therefore requires high-sensitivity light detectors and careful optimization of light transport. A detailed microphysical understanding of the optical properties of TeO$$_2$$ crystals is essential for such optimization. We present a set of quantitative measurements of light production and transport in a cubic TeO$$_2$$ crystal, verified with a complete optical model and calibrated against a UVT acrylic standard. We measure the optical surface properties of the crystal, and set stringent limits on the amount of room-temperature scintillation in TeO$$_2$$ for $$\beta$$ and $$\alpha$$ particles of 5.3 and 8 photons / MeV, respectively, at 90% confidence. Finally, the techniques described here can be used to optimize and verify the particle identification capabilities of CUPID.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1603532
Grant/Contract Number:  
AC02-05CH11231; FG02-00ER41138; SC0018987
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 14; Journal Issue: 10; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; particle identification methods; Cherenkov and transition radiation; scintillators; scintillation and light emission processes; double-beta decay detectors

Citation Formats

Huang, R. G., Benato, G., Caravaca, J., Kolomensky, Yu. G., Land, B. J., Gann, G. D. Orebi, and Schmidt, B. Characterization of light production and transport in tellurium dioxide crystals. United States: N. p., 2019. Web. https://doi.org/10.1088/1748-0221/14/10/P10032.
Huang, R. G., Benato, G., Caravaca, J., Kolomensky, Yu. G., Land, B. J., Gann, G. D. Orebi, & Schmidt, B. Characterization of light production and transport in tellurium dioxide crystals. United States. https://doi.org/10.1088/1748-0221/14/10/P10032
Huang, R. G., Benato, G., Caravaca, J., Kolomensky, Yu. G., Land, B. J., Gann, G. D. Orebi, and Schmidt, B. Wed . "Characterization of light production and transport in tellurium dioxide crystals". United States. https://doi.org/10.1088/1748-0221/14/10/P10032. https://www.osti.gov/servlets/purl/1603532.
@article{osti_1603532,
title = {Characterization of light production and transport in tellurium dioxide crystals},
author = {Huang, R. G. and Benato, G. and Caravaca, J. and Kolomensky, Yu. G. and Land, B. J. and Gann, G. D. Orebi and Schmidt, B.},
abstractNote = {Simultaneous measurement of phonon and light signatures is an effective way to reduce the backgrounds and increase the sensitivity of CUPID, a next-generation bolometric neutrinoless double-beta decay ($0\nu\beta\beta$) experiment. Light emission in tellurium dioxide (TeO$_2$) crystals, one of the candidate materials for CUPID, is dominated by faint Cherenkov radiation, and the high refractive index of TeO$_2$ complicates light collection. Positive identification of $0\nu\beta\beta$ events therefore requires high-sensitivity light detectors and careful optimization of light transport. A detailed microphysical understanding of the optical properties of TeO$_2$ crystals is essential for such optimization. We present a set of quantitative measurements of light production and transport in a cubic TeO$_2$ crystal, verified with a complete optical model and calibrated against a UVT acrylic standard. We measure the optical surface properties of the crystal, and set stringent limits on the amount of room-temperature scintillation in TeO$_2$ for $\beta$ and $\alpha$ particles of 5.3 and 8 photons / MeV, respectively, at 90% confidence. Finally, the techniques described here can be used to optimize and verify the particle identification capabilities of CUPID.},
doi = {10.1088/1748-0221/14/10/P10032},
journal = {Journal of Instrumentation},
number = 10,
volume = 14,
place = {United States},
year = {2019},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: a) The CHESS apparatus in the cosmic-muon configuration (top), and b) in the radioactive-source configuration (bottom). The array shown in (a) contains 53 potential slots for PMTs in total, but only the 12 colored slots contain PMTs for this work. These 12 PMTs are color-coded by their radialmore » distance from the center of the setup, with the inner ring in red, the middle ring in orange, and the outer ring in blue. The main difference between (a) and (b) is the substitution of the muon trigger system by the trigger PMTs attached to the target. In the radioactive-source configuration, the 12 PMTs beneath the target are not used.« less

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