Characterization of SABRE crystal NaI-33 with direct underground counting

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Date

2021

Authors

Antonello, M.
Arnquist, I.J.
Barberio, E.
Baroncelli, T.
Benziger, J.
Bignell, L.J.
Bolognino, I.
Calaprice, F.
Copello, S.
Dafinei, I.

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European Physical Journal C: Particles and Fields, 2021; 81(4):299-1-299-11

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M. Antonello ... I. Bolognino ... A. G. Williams ... et al.

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DOI

10.1140/epjc/s10052-021-09098-5

Abstract

Ultra-pure NaI(Tl) crystals are the key element for a model-independent verification of the long standing DAMA result and a powerful means to search for the annual modulation signature of dark matter interactions. The SABRE collaboration has been developing cutting-edge techniques for the reduction of intrinsic backgrounds over several years. In this paper we report the first characterization of a 3.4 kg crystal, named NaI-33, performed in an underground passive shielding setup at LNGS. NaI-33 has a record low ³⁹K contamination of 4.3 ± 0.2 ppb as determined by mass spectrometry. We measured a light yield of 11.1 ± 0.2 photoelectrons/keV and an energy resolution of 13.2% (FWHM/E) at 59.5 keV. We evaluated the activities of ²²⁶Ra and ²²⁸Th inside the crystal to be 5.9±0.6 μBq/kg and 1.6±0.3 μBq/kg, respectively, which would indicate a contamination from ²³⁸U and ²³²Th at part-per-trillion level. We measured an activity of 0.51 ± 0.02 mBq/kg due to ²¹⁰Pb out of equilibrium and a α quenching factor of 0.63 ± 0.01 at 5304 keV. We illustrate the analyses techniques developed to reject electronic noise in the lower part of the energy spectrum. A cut-based strategy and a multivariate approach indicated a rate, attributed to the intrinsic radioactivity of the crystal, of ∼1 count/day/kg/keV in the [5–20] keV region.

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Published online: 09 April 2021

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© The Author(s) 2021. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License,which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecomm ons.org/licenses/by/4.0/. Funded by SCOAP3.

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http://purl.org/au-research/grants/arc/LE170100162
 http://purl.org/au-research/grants/arc/LE16010080
 http://purl.org/au-research/grants/arc/DP170101675
 http://purl.org/au-research/grants/arc/LP150100705
 http://purl.org/au-research/grants/arc/CE200100008
 http://purl.org/au-research/grants/arc/LE190100196

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https://doi.org/10.1140/epjc/s10052-021-09098-5

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http://hdl.handle.net/2440/130398