Characterization of SABRE crystal NaI-33 with direct underground counting
| Autor: | Andrea Zani, S. Milana, A. Di Ludovico, C. Vignoli, Marcella Diemoz, Andrew Stuchbery, I. J. Arnquist, A. Di Giacinto, T. Baroncelli, Giulia D'imperio, F. Calaprice, Federico Scutti, D. D'Angelo, Jeremy Mould, M. Wada, G. Di Carlo, Anton Wallner, Elisabetta Luigia Barberio, Michael Souza, L. Pietrofaccia, Lindsey J. Bignell, Shahram Rahatlou, Gregory Lane, Anthony G. Williams, M. Zurowski, Andrea Mariani, D. Orlandi, S. Copello, M. Antonello, Eric W. Hoppe, Francesco Nuti, V. Pettinacci, I. Bolognino, I. Mahmood, Alan R. Duffy, Claudia Tomei, L. Ioannucci, P. Urquijo, M. Iannone, Ioan Dafinei, B. Suerfu, Aldo Ianni, S. Krishnan, W. Dix, J. Benziger, M. D'Incecco |
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| Rok vydání: | 2020 |
| Předmět: |
Physics - Instrumentation and Detectors
Physics and Astronomy (miscellaneous) Analytical chemistry FOS: Physical sciences lcsh:Astrophysics 01 natural sciences Atomic Crystal Particle and Plasma Physics 0103 physical sciences Energy spectrum lcsh:QB460-466 lcsh:Nuclear and particle physics. Atomic energy. Radioactivity Nuclear 010306 general physics Engineering (miscellaneous) physics.ins-det Physics Quantum Physics 010308 nuclear & particles physics Molecular Instrumentation and Detectors (physics.ins-det) Nuclear & Particles Physics Full width at half maximum 13. Climate action lcsh:QC770-798 Energy (signal processing) |
| Zdroj: | European Physical Journal C, vol 81, iss 4 European Physical Journal C: Particles and Fields, Vol 81, Iss 4, Pp 1-11 (2021) European Physical Journal |
| DOI: | 10.48550/arxiv.2012.02610 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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