ИСТИНА

Abstract. In the present work, we provide the sensitivity of the NEWSdm detector prototype (Nuclear Emulsion for WIMP Search with a directional measurement) located in Gran Sasso and consisting of 10 kg of NIT (Nano Imaging Tracker) emulsion films with grain sizes of several tens of nanometers for the detection of dark matter (DM) particles accelerated in elastic collisions with cosmic-ray nuclei (Cosmic-Ray-accelerated Dark Matter or CRDM). It is demonstrated that using the considered mass of nano-emulsion for the DM mass range from 1 keV/c2 to 1 GeV/c2 and cross-section values σχp ranging from 10−30 to 10−28 cm2 it is possible to set new constraints on DM properties. The possibility to search for a CRDM-related signal from the Galactic Center using the directional observation method is also explored in this work. According to the considered model the flux of accelerated DM particles from the Galaxy Center is approximately 15 - 20 times greater than DM flux from the perpendicular direction. However, the wide angular distribution of the nuclear recoils (CNO and hydrogen) in the detector material leads to the fact that only 3.5 times more tracks of nuclear recoils can be expected from DM particles coming from the Center of the Galaxy than from those coming of the perpendicular direction.A directional observation, i.e. a search for an excess of the flux of nuclear recoils from a certain direction, is worthwhile when carried out at the ground level to exclude substantial DM particle scattering in rock and avoid additional systematic uncertainties. All calculations have been performed for two levels of observation: the ground level near Assergi village and the level of underground LNGS facilities in Gran Sasso under about 1400 m of rock.