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Dark matter particles scattering off some target nuclei are expected todeposit very small energies in form of nuclear recoils (below 100 keV). Becauseof the low scintillation efficiency for nuclear recoils vs. electron recoils,in most of the scintillating targets considered in the search for dark matter,the region below 10 keVee concentrates most of the expected dark matter signal.For this reason, very low energy threshold (at or below 2 keVee) and very lowbackground are required. This is the case of the ANAIS (Annual modulation withNaI Scintillators) experiment. A good knowledge of the detector responsefunction for real scintillation events, a good characterization of otheranomalous or noise event populations contributing in that energy range, and thedevelopment of convenient filtering procedures for the latter are mandatory toachieve the required low background at such a low energy. In this work we willpresent the specific protocols developed to select bulk scintillation events inNaI(Tl), and its application to data obtained with the ANAIS-0 prototype.Slight differences in time constants are expected in scintillation pulsesproduced by nuclear or electron recoils in NaI(Tl), so in order to analyze theeffect of these filtering procedures in the case of a recoil populationattributable to dark matter, data from a neutron calibration have been used.

Bulk NaI(Tl) scintillation low energy events selection with the ANAIS-0 module