Xrayneutron

Xrayneutron is a hypothetical subatomic particle proposed in 2021 by the International Physics Consortium to explain anomalous scattering events observed in high-energy photon experiments. It is theorized to be a neutral, spin‑½ fermion that interacts weakly with both electromagnetic and weak nuclear forces, similar to the neutrino, but with additional coupling to X‑ray wavelengths. The particle’s mass is predicted to be in the range of 0.1 to 1 keV/c², making it lighter than most known exotic particles yet heavier than the electron neutrino.

The concept emerged from discrepancies in X‑ray attenuation measurements in dense metal targets, where traditional models could not account for the observed deviations. In 2022, a joint experiment at CERN’s X‑ray Facility reported a handful of events consistent with the signature predicted for Xrayneutrons: photons disappearing without detectable decay products, suggesting weak interaction with the detector’s lattice. Proposed detection methods include Förster resonance energy transfer and precision calorimetry of X‑ray absorption spectra.

Despite the initial excitement, the particle has yet to be confirmed by independent groups. Critics argue that the data could be reconciled through advanced simulations of photon‑matter interactions, and no reproducible evidence has emerged from neutrino detectors or astrophysical observations. If confirmed, the Xrayneutron could provide insights into dark matter interactions, as it would communicate with ordinary matter via a keV‑scale mediator, potentially opening a new window on the low‑energy frontier of particle physics.