Background analysis and status of the ANAIS dark matter project

Amaré, J.; Cebrián, S.; Cuesta, C.; Garcı́a, E.; Ginestra, C.; Martínez, M.; Oliván, M. A.; Ortigoza, Y.; Solórzano, A. Ortíz de; Pobes, C.; Puimedón, J.; Sarsa, M.L.; Villar, J. A.; Villar, P.

doi:10.1063/1.4928001

Cited by 5 publications

(4 citation statements)

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“…The best result showed contaminations in 40 K (a dangerous isotope for the background of dark matter searches) ∼2 times larger with respect to those of DAMA [2], likely because of the poor radio-purity of the starting powder. Similar results were obtained by the ANAIS collaboration, that was stuck on similar radioactive levels [3]. A more recent project,…”

Section: Crystalssupporting

confidence: 76%

New low radiation background material technology

Cardani¹

2017

Proceedings of INFN Workshop on Future Detectors — PoS(IFD2015)

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More and more experiments need materials with extremely low radioactive content. The requirements on contaminations levels are becoming so strict that "standard" techniques can not reach the sufficient sensitivity to determine if a material complies with the specifications. In this contribution I use two widely applied materials (crystals and copper) as examples to show the main issues in the achievement of a high radio-purity. Than, I present two newly developed technologies to probe bulk and surface contaminations of several materials with unprecedented sensitivity.

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Section: Crystalssupporting

confidence: 76%

New low radiation background material technology

Cardani¹

2017

Proceedings of INFN Workshop on Future Detectors — PoS(IFD2015)

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“…The ANAIS-37 set-up [35,36] combines the ANAIS-25 modules with a new one (named D2) also built by AS, using improved protocols in order to prevent radon contamination and WIMPScint-II grade powder. The crystal was received on the 6 th of March, 2015 and data taking started five days later.…”

Section: Experimental Set-upsmentioning

confidence: 99%

Assessment of backgrounds of the ANAIS experiment for dark matter direct detection

et al. 2016

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A large effort has been carried out to characterize the background of sodium iodide crystals within the Annual modulation with NaI Scintillators (ANAIS) project. In this paper, the background models developed for three 12.5 kg NaI(Tl) scintillators produced by Alpha Spectra Inc. and operated at the Canfranc Underground Laboratory are presented together with an evaluation of the background prospects for the full experiment. Measured spectra from threshold to high energy in different conditions are well described by the models based on quantified activities. At the region of interest, crystal bulk contamination is the dominant background source. Contributions from 210 Pb, 40 K, 22 Na and 3 H are the most relevant. Those from 40 K and 22 Na could be efficiently suppressed thanks to anticoincidence operation in a crystals matrix or inside a liquid scintillator veto (LSV), while that from 210 Pb has been reduced by improving crystal production methods and 3 H production could be reduced by shielding against cosmic rays during production. Assuming the activities of the last characterized detector, for nine crystals with a total mass of 112.5 kg the expected background rate is 2.5 counts/(keV kg day) in the region from 1 to 4 keV, which could be reduced at 1.4 counts/(keV kg day) by using a LSV.

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“…ANAIS-112 consists of nine modules of 12.5 kg each, made by Alpha Spectra, Inc. Colorado with ultrapure NaI powder. The so called D0, D1 and D2 modules took data in ANAIS-25 (D0 and D1) [8] and ANAIS-37 (D0, D1 and D2) [9] set-ups. We estimated their cosmogenic activation [10], measured their background after the decay of the short-lived cosmogenic radioisotopes and elaborated a satisfactory background model [11].…”

Section: Introductionmentioning

confidence: 99%

“…We estimated their cosmogenic activation [10], measured their background after the decay of the short-lived cosmogenic radioisotopes and elaborated a satisfactory background model [11]. The three modules have an excellent light yield of 15 photoelectrons/keV [9,12]. Three new modules (D3, D4 and D5) were received along 2016 and tested in ANAIS-37 set-up.…”

Section: Introductionmentioning

confidence: 99%

Annual modulation of dark matter: The ANAIS-112 case

Coarasa¹,

Amaré²,

Cebrián³

et al. 2017

Preprint

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The annual modulation measured by the DAMA/LIBRA experiment can be explained by the interaction of dark matter WIMPs in NaI(Tl) scintillator detectors. Other experiments, with different targets or techniques, exclude the region of parameters singled out by DAMA/LIBRA, but the comparison of their results relies on several hypotheses regarding the dark matter model. ANAIS-112 is a dark matter search with 112.5 kg of NaI(Tl) scintillators under commissioning at the Canfranc Underground Laboratory (LSC) to test the DAMA/LIBRA result in a model independent way. We analyze its prospects in terms of the a priori critical and detection limits of the experiment. The analysis is based on the detector response and the background level measured for the first modules operated in Canfranc.

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Background analysis and status of the ANAIS dark matter project

Cited by 5 publications

References 10 publications

New low radiation background material technology

New low radiation background material technology

Assessment of backgrounds of the ANAIS experiment for dark matter direct detection

Annual modulation of dark matter: The ANAIS-112 case

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