https://doi.org/10.1140/epjc/s10052-016-4279-2
Regular Article - Experimental Physics
Assessment of backgrounds of the ANAIS experiment for dark matter direct detection
1
Laboratorio de Física Nuclear y Astropartículas, Universidad de Zaragoza, Calle Pedro Cerbuna 12, 50009, Zaragoza, Spain
2
Laboratorio Subterráneo de Canfranc, Paseo de los Ayerbe s/n, Canfranc Estación, 22880, Huesca, Spain
3
Department of Physics, Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, WA, USA
4
Università di Roma La Sapienza, Piazzale Aldo Moro 5, 00185, Rome, Italy
* e-mail: scebrian@unizar.es
Received:
20
April
2016
Accepted:
21
July
2016
Published online:
1
August
2016
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 
Pb, 
K, 
Na and 
H are the most relevant. Those from K and Na could be efficiently suppressed thanks to anticoincidence operation in a crystals matrix or inside a liquid scintillator veto (LSV), while that from Pb has been reduced by improving crystal production methods and 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.
© The Author(s), 2016
