Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 52: Neutrino physics without accelerators V

T 52.1: Talk

Wednesday, April 1, 2020, 16:30–16:45, H-HS XIII

Project 8: First application of CRES to tritium decay — •Martin Fertl — Johannes Gutenberg-Universität, Mainz

Neutrino flavor oscillation experiments prove that neutrinos do have non-zero 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 m_ν can be determined from the highest precision measurement of the β⁻-decay spectrum of tritium around its endpoint region. The current state of the art experiment KATRIN stretches all technological limits to probe the range of m_ν down to 200 meV/c². The Project 8 collaboration envisions a completely new path to measure m_ν. The recently demonstrated technique of Cyclotron Radiation Emission Spectroscopy (CRES) allows for a frequency-based measurement of the decay electron energy. This new and staged approach to devise an experiment that combines CRES with an atomic tritium source to achieve a neutrino mass sensitivity of 40 meV/c², below the minimum m_ν predicted for the inverted neutrino mass ordering scheme will be presented. Results from the first application of CRES to the continuous decay spectrum of tritium will be discussed. This work is supported by the Cluster of Excellence “Precision Physics, Fundamental Interactions, and Structure of Matter" (PRISMA+ EXC 2118/1) funded by the German Research Foundation (DFG) within the German Excellence Strategy (Project ID 39083149), the US DOE Office of Nuclear Physics, the US NSF and internal investments at all institututions.