Owing to its low electronic noise and flexible target materials, the Spherical Proportional Counter(SPC)with a single electron detection threshold can be utilized to search for sub-GeV dark matter(DM). In this study, ...Owing to its low electronic noise and flexible target materials, the Spherical Proportional Counter(SPC)with a single electron detection threshold can be utilized to search for sub-GeV dark matter(DM). In this study, we investigate the prospects for light DM direct detection via the DM-nucleus Migdal effect in the DARKSPHERE detector. We consider different DM velocity distributions and momentum-transfer effects. For Xenon and Neon targets, we find that the DM mass mDM can be probed down to as low as m_(DM)~ O(10) MeV, and the derived bounds on the DM-nucleus scattering cross section σ_(n) are sensitive to the high-velocity tails of the DM velocity distribution,which can be altered by orders of magnitude for the different DM velocity distributions in the region mDM< 10MeV.展开更多
基金the National Natural Science Foundation of China(12275134,12275232,12335005,12147228)the Natural Science Foundation of Shandong Province,China(ZR2018QA007)。
文摘Owing to its low electronic noise and flexible target materials, the Spherical Proportional Counter(SPC)with a single electron detection threshold can be utilized to search for sub-GeV dark matter(DM). In this study, we investigate the prospects for light DM direct detection via the DM-nucleus Migdal effect in the DARKSPHERE detector. We consider different DM velocity distributions and momentum-transfer effects. For Xenon and Neon targets, we find that the DM mass mDM can be probed down to as low as m_(DM)~ O(10) MeV, and the derived bounds on the DM-nucleus scattering cross section σ_(n) are sensitive to the high-velocity tails of the DM velocity distribution,which can be altered by orders of magnitude for the different DM velocity distributions in the region mDM< 10MeV.
