Stereo neutrino spectrum of 235U fission rejects sterile neutrino hypothesis

Understand

Anomalies in past neutrino measurements have led to the discovery that these particles have non-zero mass and oscillate between their three flavors when they propagate.

• In the 2010's, similar anomalies observed in the antineutrino spectra emitted by nuclear reactors have triggered the hypothesis of the existence of a supplementary neutrino state that would be sterile i.e.
• not interacting via the weak interaction.
• The STEREO experiment was designed to study this scientific case that would potentially extend the Standard Model of Particle Physics.