Overview

• A 3 kg germanium detector placed 20.7 m from the Leibstadt reactor recorded an excess of 395 ± 106 events over a 119-day run, matching theoretical expectations.
• The experiment achieved coherent elastic neutrino–nucleus scattering with the lowest-energy reactor neutrinos observed to date.
• This miniaturized setup is orders of magnitude smaller than traditional ton-scale detectors, demonstrating a new direction in neutrino instrumentation.
• Upgraded detectors installed in autumn 2024 are now operational to deliver more precise tests of the Standard Model.
• The compact technology could enable mobile reactor monitoring for agencies like the IAEA and open avenues for probing physics beyond the Standard Model.