New Results from COHERENT's Ge-mini: Improving CEvNS Measurement on Germanium

Ge-mini, part of the COHERENT detector suite, is an array of high-purity germanium semiconductor detectors designed to measure coherent elastic neutrino-nucleus scattering (CEvNS). In 2023, Ge-mini reported its first CEvNS detection with a 3.9σ significance. Since then, the detector system has continued to collect data. In this talk, we present updates reflecting a roughly six-fold increase in exposure, enabled by increased beam power and stable operation following the completion of the proton power upgrade at the SNS. Energy thresholds have been lowered as a result of improved event reconstruction, and backgrounds have been reduced through pulse-shape discrimination techniques. These improvements allow us to significantly strengthen our measurement of CEvNS on germanium nuclei and contribute to the broader COHERENT program's precision tests of the Standard Model through low-energy threshold neutrino measurements.