Results from the NEOS Experiment (IMAGE) Institute for Basic Science Caption (a) Data collected from the NEOS experiments are compared with theoretical model (H-M-V) and a previous experiment (Daya Bay) conducted in China. Experiments and theory match for all energies, but there are some differences in the expected and calculated results at energies between 4 and 6 MeV. (b) In particular, a peak at 5 MeV, dubbed 'the 5 MeV bump', which was measured in the NEOS experiment, but not predicted in the theoretical model, is still unexplained. (c) The same peak is present in the data from the Daya Bay experiment. Credit IBS Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.