STEREO and PROSPECT are very short baseline experiments studying antineutrinos produced by highly-enriched nuclear fuel at the research facilities of Institut Laue-Langevin (Grenoble, France) and Oak Ridge National Laboratory (U.S.A.), respectively. Located at about 10 meters from the reactor cores, they investigate the data-to-prediction deficit called the « Reactor Antineutrino Anomaly » by looking for sterile neutrino oscillations and providing accurate measurements of the U235 antineutrino spectrum.
In this talk I will present a joint analysis performed by the STEREO and PROSPECT collaborations. The two experimental energy spectra have been simultaneously unfolded to provide a reference spectrum in true antineutrino energy for the U235 isotope, achieving the highest precision for pure-U235 experiments. This new experimental reference will be compared to theoretical predictions in order to quantify the observed excess of events around 5 MeV. This measurement proves also to be complementary to the results from experiments using low-enriched nuclear fuel, such as Daya Bay, where several isotopes contribute to the antineutrino spectrum. In addition, I will present the status of the search for sterile neutrinos with the STEREO detector, including preliminary results with the full collected data set.
|Collaboration / Activity||STEREO|
|First author||Matthieu Licciardi|