Theoretical direct WIMP detection rates for transitions to excited states

Abstract

The recent WMAP and Planck data have confirmed that exotic dark matter together with the vacuum energy (cosmological constant) dominate in the flat Universe. Many extensions of the standard model provide dark matter candidates, in particular Weakly Interacting Massive Particles (WIMPs). %Supersymmetry provides a natural dark matter candidate, the lightest supersymmetric particle (LSP). Thus the direct dark matter detection is central to particle physics and cosmology. Most of the research on this issue has hitherto focused on the detection of the recoiling nucleus. In this paper we study transitions to the excited states, possible in some nuclei, which have sufficiently low lying excited states. Good examples are the first excited states of I-127 and Xe-129. %focusing on the first excited state at 50 keV of Iodine A=127. We find appreciable branching ratios for the inelastic scattering mediated by the spin cross sections. %find that the transition rate to this excited state is about 5 %percent of the transition to the ground state for low mass WIMPS, but the branching ratio can be much larger in the case pf heaver WIMPS. So, in principle, the extra signature of the gamma ray following the de-excitation of these states can, in principle, be exploited experimentally.

13 pages, 9 figures, 2 tables

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• Dark Matter from new Technicolor Theories
• Spin-dependent WIMP scattering off nuclei
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• Signatures of Dark Matter Scattering Inelastically Off Nuclei
• Prospects of Migdal Effect in the Explanation of XENON1T Electron Recoil Excess
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• Search for inelastic WIMP nucleus scattering on ${}^{129}$Xe in data from the XMASS-I experiment
• Spin-dependent sub-GeV Inelastic Dark Matter-electron scattering and Migdal effect: (I). Velocity Independent Operator
• Theoretical direct WIMP detection rates for transitions to nuclear excited states
• Light WIMP searches involving electron scattering
• Low-mass extension of direct detection bounds on WIMP-quark and WIMP-gluon effective interactions using the Migdal effect
• Inelastic WIMP-nucleus scattering to the first excited state in ${}^{125}$Te
• Probing Dark Matter Electromagnetic Properties in Direct Detection Experiments
• Search for inelastic WIMP-iodine scattering with COSINE-100
• Solar neutrinos as background in dark matter searches involving electron detection
• Searching for light WIMPS in view of neutron decay to dark matter
• Comparison of the Migdal transition probabilities in electron-atom inelastic cross sections
• Observing the Migdal effect from nuclear recoils of neutral particles with liquid xenon and argon detectors