Heidelberg 2022 – wissenschaftliches Programm
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SYMD: Symposium SMuK Dissertation Prize 2022
SYMD 1: Symposium SMuK Dissertation Prize 2022
SYMD 1.2: Hauptvortrag
Montag, 21. März 2022, 14:25–14:50, Audimax
First tritium β-decay spectrum recorded with Cyclotron Radiation Emission Spectroscopy (CRES) — •Christine Claessens — Center for Experimental Nuclear Physics and Astrophysics, University of Washington, WA, USA
The observation of neutrino flavor oscillation proved that neutrinos have mass, thereby requiring us to extend the Standard Model of particle physics. Until now, laboratory experiments could only set upper limits on the electron-weighted neutrino mass mβ < 0.8 eV/c2. The Project 8 collaboration aims to determine the absolute neutrino mass scale from the distortion of the tritium beta decay spectrum near the endpoint. To this end, the collaboration has successfully established CRES, a frequency-based approach to detect electrons and measure their kinetic energy. In this work, an event detection system consisting of real-time triggering and offline event reconstruction has been developed. Since the neutrino mass is determined from the shape distortion it induces in the tritium spectrum, it is essential to quantify any dependence of the electron detection efficiency on energy or, equivalently, frequency. This work demonstrates the importance of including the detection efficiency in the analysis of the first tritium spectrum recorded with CRES for an accurate endpoint measurement and the extraction of the electron-weighted antineutrino mass. In addition, a requirement for the precision of detection efficiency measurements for a future CRES experiment with a 40 meV/c2 target sensitivity has been determined.