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Keyword：mirror neutron
No Evidence of Mirror Neutrons Found in Swiss PSI Ultracold Neutron Experiment
The Ultracold Neutron Physics Group at the Paul Scherrer Institute (PSI) in Switzerland recently stated that its research team found no evidence of spontaneous transformation of ordinary neutrons into mirror neutrons in a high-precision experiment. The researchers said the result essentially rules out the main parameter space previously suggested for anomalous neutron-mirror neutron oscillation signals, and also weakens the possibility that mirror neutrons could be a component of dark matter. Bernhard Lauss (left) and Géza Zsigmond examined approximately 2.5 billion neutrons at the ultracold neutron source at the Paul Scherrer Institute (PSI). They essentially ruled out the hypothesis of spontaneous transformation of neutrons into mirror neutrons. (Image courtesy of Paul Scherrer Institute PSI/Ma...
2026-09-07
Swiss PSI Ultracold Neutron Experiment Finds No Signs of "Mirror World" Oscillation
The Paul Scherrer Institute (PSI) in Switzerland announced on July 28 that its researchers detected approximately 25 billion neutrons in an ultracold neutron experiment and found no signs of neutrons spontaneously transforming into mirror neutrons. The results constrain, with high certainty, the theoretical possibility of neutrons disappearing into the so-called mirror world. The mirror world hypothesis posits that every elementary particle in the real world may have a corresponding mirror particle, such as mirror electrons, mirror protons, and mirror neutrons. Such particles interact extremely weakly with ordinary matter, potentially connecting primarily through gravity or rare oscillations of neutral particles, and have therefore also been considered as dark matter candidates...
2026-08-03