Project 8: A frequency-based approach to measure the absolute neutrino mass scale

Martin Fertl (U Washington)
Event Date and Time: 
Thu, 2018-05-17 14:00 - 15:00
TRIUMF Auditorium

Neutrino flavor oscillation experiments prove that neutrinos do have nonzero masses. Extensions to the Standard Model of Particle Physics have been developed to explain the non-zero masses and can be directly tested by a measurement of the absolute neutrino mass scale. The mass of the electron antineutrino can be determined from the highest precision measurement of the beta-decay spectrum of tritium around its endpoint region (Q = 18.6 keV). The current state of the art experiment stretches all technological limits to probe the range of the electron antineutrino mass down to 200meV. A completely new path has to be envisioned to test the full range of electron neutrino masses allowed in the inverted neutrino mass ordering scheme. The Project 8 collaboration has recently demonstrated the novel technique of Cyclotron Radiation Emission Spectroscopy (CRES) to pursue a frequency-based measurement approach. I will present this new approach and results obtained with mono-energetic conversion electrons from 83m^Kr. The phased program towards a measurement using atomic tritium with a mass sensitivity potentially below 40meV will be discussed as well as the application of CRES to high energy beta-decays in searches for exotic, tensor-like interactions.

Financial support by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics to the University of Washington under Award Number DE-FG02-97ER41020 is acknowledged.

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