Preliminary results of ANAIS-25

Abstract

The ANAIS (Annual Modulation with NaI(Tl) Scintillators) experiment aims at the confirmation of the DAMA/LIBRA signal using the same target and technique at the Canfranc Underground Laboratory. 250 kg of ultrapure NaI(Tl) crystals will be used as a target, divided into 20 modules, each coupled to two photomultipliers. Two NaI(Tl) crystals of 12.5 kg each, grown by Alpha Spectra from a powder having a potassium level under the limit of our analytical techniques, form the ANAIS-25 set-up. The background contributions are being carefully studied and preliminary results are presented: their natural potassium content in the bulk has been quantified, as well as the uranium and thorium radioactive chains presence in the bulk through the discrimination of the corresponding alpha events by PSA, and due to the fast commissioning, the contribution from cosmogenic activated isotopes is clearly identified and their decay observed along the first months of data taking. Following the procedures established with ANAIS-0 and previous prototypes, bulk NaI(Tl) scintillation events selection and light collection efficiency have been also studied in ANAIS-25.

4 pages, 6 Figures

References in corpus (1)

• New results from DAMA/LIBRA

Cited by in corpus (28)

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• First search for a dark matter annual modulation signal with NaI(Tl) in the Southern Hemisphere by DM-Ice17
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• Analysis of backgrounds for the ANAIS-112 dark matter experiment
• First data from DM-Ice17
• Cosmogenic radionuclide production in NaI(Tl) crystals
• Assessment of backgrounds of the ANAIS experiment for dark matter direct detection
• Understanding NaI(Tl) crystal background for dark matter searches
• The COSINE-100 Liquid Scintillator Veto System
• The Past and Future of Light Dark Matter Direct Detection
• Performance of a prototype active veto system using liquid scintillator for a dark matter search experiment
• Radioactive contamination of scintillators
• Study of scintillation in natural and synthetic quartz and methacrylate
• Limits on Interactions between Weakly Interacting Massive Particles and Nucleons Obtained with NaI(Tl) crystal Detectors
• Particle detection at cryogenic temperatures with undoped CsI
• Pulse-shape discrimination between electron and nuclear recoils in a NaI(Tl) crystal
• Sensitivity of alkali halide scintillating calorimeters with particle identification to investigate the DAMA dark matter detection claim
• Status of the ANAIS Dark Matter Project at the Canfranc Underground Laboratory
• Annual modulation of dark matter: The ANAIS-112 case
• Production and relevance of cosmogenic radionuclides in NaI(Tl) crystals
• The ANAIS Dark Matter Project: Status and Prospects
• Measurement of low-energy background events due to ${}^{222}$Rn contamination on the surface of a NaI(Tl) crystal
• Composite dark matter and direct-search experiments
• Light Collection in the Prototypes of the ANAIS Dark Matter Project
• Results and prospects of deep under-ground, under-water and under-ice experiments