Search for boosted keV-MeV light dark matter particles from evaporating primordial black holes at the CDEX-10 experiment
Abstract
We present novel constraints on boosted light dark matter particles (denoted as ``'') from evaporating primordial black holes (PBHs) using 205.4 kg·day data from the China Jinping Underground Laboratory's CDEX-10 p-type point contact germanium detector with a 160 eVee analysis threshold. from PBHs with masses ranging from 1×1015 g to 7×1016 g are searched in this work. In the presence of PBH abundance compatible with present bounds, our result excludes the -nucleon elastic-scattering cross section region from 3.4×10-32 cm2 to 2.3×10-29 cm2 for of 1 keV to 24 MeV from PBHs with masses of 5×1015 g, as well as from 1.1×10-28 cm2 to 7.6×10-28 cm2 for of 1 keV to 0.6 MeV from PBHs with masses of 7×1016 g. If the -nucleon elastic-scattering cross section can be determined in the future, the abundance of PBHs may be severely constrained by evaporation. With the lower threshold (160 eVee) of the CDEX-10 experiment compared to the previously used experiments, this work allows for a better reach at soft spectra produced by heavier PBHs, which demonstrates the vast potential of such a technical route to pursue from larger PBHs with a low threshold.
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