Speaker
Dr
Clara Cuesta
(University of Washington)
Description
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 are currently taking data at the LSC (ANAIS-25) and a new detector, with improved performances, will be received at the beginning of 2015. The comparison of the background model for the ANAIS-25 prototypes with the experimental results will be presented. ANAIS crystal radiopurity goals have been achieved for Th-232 and U-238 chains, and are at reach for K-40 but a Pb-210 contamination out-of-equilibrium has been identified, whose origin is being studied. The high light collection efficiency obtained with these prototypes allows to anticipate an energy threshold of the order of 1 keVee. Preliminary estimates of trigger efficiency at very low energy will be also presented.
Primary author
Dr
Clara Cuesta
(University of Washington)
