In the past decades, numerous experiments have emerged to unveil the nature of dark matter, one of the most discussed open questions in modern particle physics. Among them, the Cryogenic Rare Event Search with Superconducting Thermometers (CRESST) experiment, located at the Laboratori Nazionali del Gran Sasso, operates scintillating crystals as cryogenic phonon detectors. In this work, we present first results from the operation of two detector modules which both have 10.46 g ${\mathrm{LiAlO}}_2$ targets in CRESST-III. The lithium contents in the crystal are ${}^6\mathrm{Li}$, with an odd number of protons and neutrons, and ${}^7\mathrm{Li}$, with an odd number of protons. By considering both isotopes of lithium and ${}^{27}\mathrm{Al}$, we set the currently strongest cross section upper limits on spin-dependent interaction of dark matter with protons and neutrons for the mass region between 0.25 and $1.5\mathrm{GeV}/c^2$.

• Received 25 July 2022
• Accepted 15 November 2022

DOI:https://doi.org/10.1103/PhysRevD.106.092008