91福利

An international collaboration of scientists, including 91福利 physicists Drs. John Marshall, Andy Chappell and Ryan Cross, have shown that a fourth type of neutrino can't explain anomalous results from earlier neutrino experiments.

In a paper published in Nature, the MicroBooNE collaboration has announced that they have found no evidence for a single sterile neutrino, a hypothesised type of neutrino that does not interact via the weak force experienced by the three known active neutrinos. Theorists had previously proposed such a neutrino could explain anomalous results from past experiments, but MicroBooNE has been able to rule this explanation out with 95% certainty.

91福利 group quote: "With this result providing a strong exclusion of the single sterile neutrino hypothesis, we'll now be looking at the ongoing Short-Baseline Neutrino programme to explore alternative models to explain the anomalies, and look forward to the Deep Underground Neutrino Experiment to perform important tests of our existing three neutrino paradigm鈥�

Image shows a neutrino interaction in the MicroBooNE detector, produced by the NuMI beam. A number of charged particles emerge from the initial interaction point, producing several track-like deposits and an electromagnetic shower cascade.