Due to the low nuclear recoils,sub-Ge V dark matter(DM)is usually beyond the sensitivity of the conventional DM direct detection experiments.The boosted and Migdal scattering mechanisms have been proposed as two new c...Due to the low nuclear recoils,sub-Ge V dark matter(DM)is usually beyond the sensitivity of the conventional DM direct detection experiments.The boosted and Migdal scattering mechanisms have been proposed as two new complementary avenues to search for light DM.In this study,we consider the momentum-transfer effect in the DM-nucleus scattering to derive the new bounds on sub-GeV DM for these two scenarios.We show that such an effect is sizable so that the existing bounds on the DM-nucleus scattering cross section can be improved significantly.展开更多
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supported by the National Natural Science Foundation of China(Grant No.12275134)supported by the National Natural Science Foundation of China(Grant No.12275232)+1 种基金the Natural Science Foundation of Shandong Province(Grant No.ZR2018QA007)supported by the Australian Research Council(Grant Nos.DP190100974,and DP200100150)。
文摘Due to the low nuclear recoils,sub-Ge V dark matter(DM)is usually beyond the sensitivity of the conventional DM direct detection experiments.The boosted and Migdal scattering mechanisms have been proposed as two new complementary avenues to search for light DM.In this study,we consider the momentum-transfer effect in the DM-nucleus scattering to derive the new bounds on sub-GeV DM for these two scenarios.We show that such an effect is sizable so that the existing bounds on the DM-nucleus scattering cross section can be improved significantly.
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.
