Abstract
In this work, a first cryogenic characterization of a scintillating hbox {LiAlO}_{2} single crystal is presented. The results achieved show that this material holds great potential as a target for direct dark matter search experiments. Three different detector modules obtained from one crystal grown at the Leibniz-Institut für Kristallzüchtung (IKZ) have been tested to study different properties at cryogenic temperatures. Firstly, two 2.8 g twin crystals were used to build different detector modules which were operated in an above-ground laboratory at the Max Planck Institute for Physics (MPP) in Munich, Germany. The first detector module was used to study the scintillation properties of hbox {LiAlO}_{2} at cryogenic temperatures. The second achieved an energy threshold of (213.02pm 1.48) eV which allows setting a competitive limit on the spin-dependent dark matter particle-proton scattering cross section for dark matter particle masses between 350,hbox {MeV/c}^{2} and 1.50,hbox {GeV/c}^{2}. Secondly, a detector module with a 373 g hbox {LiAlO}_{2} crystal as the main absorber was tested in an underground facility at the Laboratori Nazionali del Gran Sasso (LNGS): from this measurement it was possible to determine the radiopurity of the crystal and study the feasibility of using this material as a neutron flux monitor for low-background experiments.
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