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arXiv · 1106.0568

Performance of a large TeO2 crystal as a cryogenic bolometer in searching for neutrinoless double beta decay

L. Cardani·L. Gironi·J. W. Beeman·I. Dafinei·Z. Ge·G. Pessina·S. Pirro·Y. Zhu
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Abstract

Bolometers are ideal devices in the search for neutrinoless Double Beta Decay. Enlarging the mass of individual detectors would simplify the construction of a large experiment, but would also decrease the background per unit mass induced by alpha-emitters located close to the surfaces and background arising from external and internal gamma's. We present the very promising results obtained with a 2.13 kg TeO2 crystal. This bolometer, cooled down to a temperature of 10.5 mK in a dilution refrigerator located deep underground in the Gran Sasso National Laboratories, represents the largest thermal detector ever operated. The detector exhibited an energy resolution spanning a range from 3.9 keV (at 145 keV) to 7.8 keV (at the 2615 gamma-line of 208Tl) FWHM. We discuss the decrease in the background per unit mass that can be achieved increasing the mass of a bolometer.

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L. Cardani, L. Gironi, J. W. Beeman, I. Dafinei, Z. Ge, G. Pessina, S. Pirro, Y. Zhu. 2011-06-03. Performance of a large TeO2 crystal as a cryogenic bolometer in searching for neutrinoless double beta decay. https://doi.org/10.1088/1748-0221/7/01/p01020

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