Ionization of Atoms by Slow Heavy Particles, Including Dark Matter

B. M. Roberts, V. V. Flambaum, G. F. Gribakin

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)
238 Downloads (Pure)

Abstract

Atoms and molecules can become ionized during the scattering of a slow, heavy particle off a bound electron. Such an interaction involving leptophilic weakly interacting massive particles (WIMPs) is a promising possible explanation for the anomalous 9σ annual modulation in the DAMA dark matter direct detection experiment [R. Bernabei et al., Eur. Phys. J. C 73, 2648 (2013)]. We demonstrate the applicability of the Born approximation for such an interaction by showing its equivalence to the semiclassical adiabatic treatment of atomic ionization by slow-moving WIMPs. Conventional wisdom has it that the ionization probability for such a process should be exponentially small. We show, however, that due to nonanalytic, cusplike behavior of Coulomb functions close to the nucleus this suppression is removed, leading to an effective atomic structure enhancement. We also show that electron relativistic effects actually give the dominant contribution to such a process, enhancing the differential cross section by up to 1000 times.
Original languageEnglish
Article number023201
Number of pages5
JournalPhysical Review Letters
Volume116
Issue number2
DOIs
Publication statusPublished - 12 Jan 2016

Fingerprint Dive into the research topics of 'Ionization of Atoms by Slow Heavy Particles, Including Dark Matter'. Together they form a unique fingerprint.

Cite this