Prof. Thomas Udem (Max-Planck Inst.)
Time can be measured with the best accuracy of all physical quantities and forms the basis of all precision measurements. Usually this is accomplished by determining the period of an atomic oscillator. To measure means to compare. Measuring time essentially means to compare the number of cycles of different oscillators. I will elaborate on how this has been done in the past, what the state of...
Dr Gabriele Sirri (INFN Bologna)
The OPERA neutrino experiment located in the underground Gran Sasso Laboratory measured the velocity of neutrinos composing the CERN CNGS beam over a baseline of about 730 km. Dedicated upgrades of the CNGS timing system and of the OPERA detector, as well as a high precision geodesy campaign for the measurement of the neutrino baseline, allowed to set a limit on the muon neutrino velocity with...