Observation of a low energy nuclear recoil peak in the neutron calibration data of the CRESST-III experiment

New-generation direct searches for low mass dark matter feature detection thresholds at energies well below 100 eV, much lower than the energies of commonly used x-ray calibration sources. This requires new calibration sources with sub-keV energies. When searching for nuclear recoil signals, the calibration source should ideally cause monoenergetic nuclear recoils in the relevant energy range. Recently, a new calibration method based on the radiative neutron capture on W182 with subsequent deexcitation via single γ-emission leading to a nuclear recoil peak at 112 eV was proposed. The CRESST-III dark matter search operated several CaWO4-based detector modules with detection thresholds below 100 eV in the past years. We report the observation of a peak around the expected energy of 112 eV in the data of three different detector modules recorded while irradiated with neutrons from different AmBe calibration sources. We compare the properties of the observed peaks with geant-4 simulations and assess the prospects of using this for the energy calibration of CRESST-III detectors.