COHERENT · 2025
Evidence of Coherent Elastic Neutrino-Nucleus Scattering with COHERENT’s Germanium Array
Phys.Rev.Lett. 134 231801 · 10.1103/PhysRevLett.134.231801
Measurements
| Current | Flavor | Target | Topology | Type | Observables | Energy |
|---|---|---|---|---|---|---|
| NC | νμ, ν̄μ, νe | Ge | CEvNS | total | evidence of CEvNS on germanium | stopped-pion (SNS) |
Abstract
We report the first detection of coherent elastic neutrino-nucleus scattering (CEvNS) on natural germanium, measured at the Spallation Neutron Source at Oak Ridge National Laboratory. The Ge-Mini detector of the COHERENT collaboration employs large-mass, low-noise, high-purity germanium spectrometers, enabling excellent energy resolution, and an analysis threshold of 1.5 keV electron-equivalent ionization energy. We observe a on-beam excess of 20.6 +7.1 -6.3 counts with a total exposure of 10.22 GWhkg and we reject the no-CEvNS hypothesis with 3.9 sigma significance. The result agrees with the predicted standard model of particle physics signal rate within 2 sigma.
Citation
@article{COHERENT:2024axu,
collaboration = "COHERENT",
title = "{Evidence of Coherent Elastic Neutrino-Nucleus Scattering with COHERENT’s Germanium Array}",
eprint = "2406.13806",
doi = "10.1103/PhysRevLett.134.231801",
journal = "Phys.Rev.Lett.",
volume = "134",
pages = "231801",
year = "2025",
}