Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-07-16
Phys.Rev.Lett.106:011301,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
3 pages, 1 figure, accepted for publication in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.106.011301
The inelastic dark matter scenario was proposed to reconcile the DAMA annual modulation with null results from other experiments. In this scenario, WIMPs scatter into an excited state, split from the ground state by an energy delta comparable to the available kinetic energy of a Galactic WIMP. We note that for large splittings delta, the dominant scattering at DAMA can occur off of thallium nuclei, with A~205, which are present as a dopant at the 10^-3 level in NaI(Tl) crystals. For a WIMP mass m~100GeV and delta~200keV, we find a region in delta-m-parameter space which is consistent with all experiments. These parameters in particular can be probed in experiments with thallium in their targets, such as KIMS, but are inaccessible to lighter target experiments. Depending on the tail of the WIMP velocity distribution, a highly modulated signal may or may not appear at CRESST-II.
Chang Spencer
Lang Rafael F.
Weiner Neal
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