ANAIS-112: updated results on annual modulation with three-year exposure

The ANAIS experiment is intended to search for dark matter annual modulation with ultrapure NaI(Tl) scintillators in order to provide a model independent confirmation or refutation of the long-standing DAMA/LIBRA positive annual modulation signal in the low energy detection rate, using the same targ...

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Published inarXiv.org
Main Authors Coarasa, Iván, Amaré, Julio, Apilluelo, Jaime, Cebrián, Susana, Cintas, David, García, Eduardo, Martínez, María, Oliván, Miguel Ángel, Ortigoza, Ysrael, Ortiz de Solórzano, Alfonso, Pardo, Tamara, Puimedón, Jorge, Salinas, Ana, Sarsa, María Luisa, Villar, Patricia
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 04.11.2023
Subjects
Dark matter
Filtration
Galactic halos
Machine learning
Modulation
Scintillation counters
Sensitivity
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Summary:The ANAIS experiment is intended to search for dark matter annual modulation with ultrapure NaI(Tl) scintillators in order to provide a model independent confirmation or refutation of the long-standing DAMA/LIBRA positive annual modulation signal in the low energy detection rate, using the same target and technique. Other experiments exclude the region of parameters singled out by DAMA/LIBRA. However, these experiments use different target materials, so the comparison of their results depends on the models assumed for the dark matter particle and its distribution in the galactic halo. ANAIS-112, consisting of nine 12.5 kg NaI(Tl) modules produced by Alpha Spectra Inc., disposed in a 3\(\times\)3 matrix configuration, is taking data smoothly with excellent performance at the Canfranc Underground Laboratory, Spain, since August, 2017. Last published results corresponding to three-year exposure were compatible with the absence of modulation and incompatible with DAMA/LIBRA for a sensitivity above 2.5\(\sigma\) C.L. Present status of the experiment and a reanalysis of the first 3 years data using new filtering protocols based on machine-learning techniques are reported. This reanalysis allows to improve the sensitivity previously achieved for the DAMA/LIBRA signal. Updated sensitivity prospects are also presented: with the improved filtering, testing the DAMA/LIBRA signal at 5\(\sigma\) will be within reach in 2025.
ISSN:2331-8422