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Analysis of the 40K contamination in NaI(Tl) crystals from different providers in the frame of the ANAIS project by Cuesta, Clara; Amaré, Julio; Cebrián, Susana; García, Eduardo; Ginestra, Carlos; Martínez, María; Oliván, Miguel A.; Ortigoza, Ysrael; de Solórzano, Alfonso Ortíz; Pobes, Carlos; Puimedón, Jorge; Sarsa, María Luisa; Villar, José Ángel; Villar, Patricia is a scholarly article available to read on EtoBox.

What is Analysis of the 40K contamination in NaI(Tl) crystals from different providers in the frame of the ANAIS project about?

NaI(Tl) large crystals are applied in the search for galactic dark matter particles through their elastic scattering off the target nuclei in the detector by measuring the scintillation signal produced. However, energies deposited in the form of nuclear recoils are small, which added to the low efficiency to convert that energy into scintillation, makes that events at or very near the energy threshold, attributed either to radioactive backgrounds or to spurious noise (non-bulk NaI(Tl) scintillation events), can compromise the sensitivity goals of such an experiment. DAMA/LIBRA experiment, using 250 kg NaI(Tl) target, reported first evidence of the presence of an annual modulation in the detection rate compatible with that expected for a dark matter signal just in the region below 6 keVee (electron equivalent energy). In the frame of the ANAIS (Annual modulation with NaI Scintillators) dark matter search project a large and long effort has been carried out in order to understand the origin of events at very low energy in large sodium iodide detectors and develop convenient filters to reject those non attributable to scintillation in the bulk NaI(Tl) crystal. 40K is probably the most

Author

Cuesta, Clara; Amaré, Julio; Cebrián, Susana; García, Eduardo; Ginestra, Carlos; Martínez, María; Oliván, Miguel A.; Ortigoza, Ysrael; de Solórzano, Alfonso Ortíz; Pobes, Carlos; Puimedón, Jorge; Sarsa, María Luisa; Villar, José Ángel; Villar, Patricia

Published

2014

Language

EN