http://arxiv.org/abs/2112.11810
A novel detection of sub-GeV dark matter is proposed in the paper. The electron cloud are boosted by the dark matter and throw away an electron when it is dragged back by the heavy nucleus, namely the coherent scattering of the electron cloud of the atom. The survey in the X-ray diffraction shows that the atomic form factor are much complicate than the naive consideration. The results of the relativistic Hartree-Fock method gives non-trivial shapes of the atom. The detailed calculation of recoil of the electron cloud. The kinetics, the fiducial cross section and the corresponding calculation of detection rate are given analytically. The numerical results show that the limits of the RHF form factor are much stringent than the recoil of a single electron, almost 4 orders stronger. The limits on the RHF form factor are more stringent than the Migdal effect below about several hundred MeV. The physical picture and the corresponding results are promising and need further explorations.
J. Guo, Y. Sun, W. Wang, et. al.
Thu, 23 Dec 21
30/63
Comments: 12 pages, 8 figures