'ghost particles’
On 26 August 2025, a physics experiment started at the Jiangmen Underground Neutrino Observatory (JUNO). The international collaboration of scientists involved in the experiment, which includes employees of the Laboratory of Nuclear Problems at JINR, officially announced the completion of filling JUNO’s central detector with 20 000 tonnes of liquid scintillator and began registering physics events. The aim of the experiment is to determine neutrino mass ordering and to precisely measure the parameters of neutrino oscillations.