Search for Low-Mass Dark Matter with CsI(Tl) Crystal Detectors

Abstract

We present a search for low-mass ($\le 20GeV/c^2$) weakly interacting massive particles(WIMPs), strong candidates of dark matter particles,using the low-background CsI(Tl) detector array of the Korea Invisible Mass Search (KIMS) experiment. With a total data exposure of 24,324.3kg$\cdot$days,we search for WIMP interaction signals produced by nuclei recoiling from WIMP-nuclear elastic scattering with visible energies between 2 and 4keV. The observed energy distribution of candidate events is consistent with null signals, and upper limits of the WIMP-proton spin-independent interaction are set with a 90% confidence level. The observed limit rejects most of the low mass region of parameter space favored by the DAMA annual modulation signal.

6pages, 5 figures

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• Improving ANAIS-112 sensitivity to DAMA/LIBRA signal with machine learning techniques
• Neutron calibration facility with an Am-Be source for pulse shape discrimination measurement of CsI(Tl) crystals
• Light yield of an undoped CsI crystal coupled directly to a photomultiplier tube at 77 Kelvin
• Sensitive neutron detection method using delayed coincidence transitions in existing iodine-containing detectors
• Characterisation of Dark Matter in Direct Detection Experiments: Singlino Versus Higgsino
• Explaining DAMA with proton-philic spin-dependent inelastic Dark Matter (pSIDM): a frequentist analysis