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Anisotropic scintillators can offer a unique possibility to exploit theso-called directionality approach in order to investigate the presence of thoseDark Matter (DM) candidates inducing nuclear recoils. In fact, their use canovercome the difficulty of detecting extremely short nuclear recoil traces. Inthis paper we present recent measurements performed on the anisotropic responseof a ZnWO$_4$ crystal scintillator to nuclear recoils, in the framework of theADAMO project. The anisotropic features of the ZnWO$_4$ crystal scintillatorswere initially measured with $\alpha$ particles; those results have been alsoconfirmed by the additional measurements presented here. The experimentalnuclear recoil data were obtained by using a neutron generator at ENEA-CASACCIAand neutron detectors to tag the scattered neutrons; in particular, thequenching factor values for nuclear recoils along different crystallographicaxes have been determined for three different neutron scattering angles (i.e.nuclear recoils energies). From these measurements, the anisotropy of the lightresponse for nuclear recoils in the ZnWO$_4$ crystal scintillator has beendetermined at 5.4 standard deviations.

Measurements of ZnWO$_4$ anisotropic response to nuclear recoils for the ADAMO project