Background analysis and status of the ANAIS dark matter project
Amaré, J. · Cebrián, S. · Cuesta, C. · García, E. · Ginestra, C. · Martínez, M. · Oliván, M. A. · Ortigoza, Y. · de Solórzano, A. Ortiz · Pobes, C. · Puimedón, J. · Sarsa, M. L. · Villar, J. A. · Villar, P.
Original · EN
ANAIS (Annual modulation with NaI Scintillators) is a project aiming to set up at the new facilities of the Canfranc Underground Laboratory (LSC), a large scale NaI(Tl) experiment in order to explore the DAMA/LIBRA annual modulation positive result using the same target and technique. Two 12.5 kg each NaI(Tl) crystals provided by Alpha Spectra took data at the LSC in the ANAIS-25 set-up. The comparison of the background model for the ANAIS-25 prototypes with the experimental results is presented. ANAIS crystal radiopurity goals have been achieved for Th-232 and U-238 chains, but a Pb-210 contamination out-of-equilibrium was identified, whose origin has been studied. The high light collection efficiency obtained with these prototypes allows to anticipate an energy threshold of the order of 1 keVee. A new detector, with improved performances, was received in March 2015 and very preliminary results are shown.
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