OPERA collaboration reports the observation of a total of 10 candidate events for a muon to tau-neutrino conversion, in what are the very final results of the experiment.
Read the final publication in today’s , This demonstrates unambiguously that muon neutrinos oscillate into tau-neutrinos on their way from CERN, where muon neutrinos were produced, to the Gran Sasso Laboratory 730km away, where OPERA detected the ten tau-neutrino candidates. The OPERA collaboration has also made their data public through the .
OPERA observed the first tau-lepton event (evidence of muon-neutrino oscillation) in 2010, here below you see a picture of the working group taken few days before the announcement of the first tau neutrino event. Prof Antonio Ereditato (University of Bern) in the center of the picture, was the spokesman of the OPERA collaboration at the time. Three Swiss groups were involved in the experiment: Bern, ETHZ and Neuchatel. They all gave important contributions to many aspects of the project: emulsion scanning, physics analysis and muon spectrometers. Many Swiss students made their Master and PhD theses throughout the life of the experiment.
Nuclear emulsion technology finds applications in a wide range of other scientific areas from dark matter search to volcano and glacier investigation. It is also applied to optimise the hadron therapy for cancer treatment and was recently used to map out the interior of the Great Pyramid, one of the oldest and largest monuments on Earth, built during the dynasty of the pharaoh Khufu, also known as Cheops.
The pictures below are taken from the article: “The discovery of the appearance of νμ − ντ oscillations” by Antonio Ereditato Nuclear Physics B 908 (2016) 116–129, and the video has been published by CERN in the occasion of the first announcement of the OPERA observed the first tau-lepton event.