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Characterization of SABRE crystal NaI-33 with direct underground counting
- Antonello, M;
- Arnquist, IJ;
- Barberio, E;
- Baroncelli, T;
- Benziger, J;
- Bignell, LJ;
- Bolognino, I;
- Calaprice, F;
- Copello, S;
- Dafinei, I;
- D’Angelo, D;
- D’Imperio, G;
- D’Incecco, M;
- Di Carlo, G;
- Diemoz, M;
- Di Giacinto, A;
- Di Ludovico, A;
- Dix, W;
- Duffy, AR;
- Hoppe, E;
- Ianni, A;
- Iannone, M;
- Ioannucci, L;
- Krishnan, S;
- Lane, GJ;
- Mahmood, I;
- Mariani, A;
- Milana, S;
- Mould, J;
- Nuti, F;
- Orlandi, D;
- Pettinacci, V;
- Pietrofaccia, L;
- Rahatlou, S;
- Scutti, F;
- Souza, M;
- Stuchbery, AE;
- Suerfu, B;
- Tomei, C;
- Urquijo, P;
- Vignoli, C;
- Wallner, A;
- Wada, M;
- Williams, AG;
- Zani, A;
- Zurowski, M
- et al.
Published Web Location
https://doi.org/10.1140/epjc/s10052-021-09098-5Abstract
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 $$^{39}$$ 39 K 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 $$^{226}$$ 226 Ra and $$^{228}$$ 228 Th inside the crystal to be $$5.9\pm 0.6~\upmu $$ 5.9 ± 0.6 μ Bq/kg and $$1.6\pm 0.3~\upmu $$ 1.6 ± 0.3 μ Bq/kg, respectively, which would indicate a contamination from $$^{238}$$ 238 U and $$^{232}$$ 232 Th at part-per-trillion level. We measured an activity of 0.51 ± 0.02 mBq/kg due to $$^{210}$$ 210 Pb out of equilibrium and a $$\alpha $$ 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 $$\sim $$ ∼ 1 count/day/kg/keV in the [5–20] keV region.
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