Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 8: Neutrino physics 2

T 8.7: Talk

Monday, March 4, 2024, 17:30–17:45, Geb. 30.22: Gaede-HS

CRES demonstrator design optimization based on CRES signal decoding with likelihood techniques — •René Reimann, Florian Thomas, Sebastian Böser, and Martin Fertl for the Project 8 collaboration — Institute of Physics and Cluster of Excellence PRISMA+, Johannes Gutenberg University Mainz, 55099 Mainz, Germany

While neutrino flavor oscillations prove neutrinos have mass, the absolute neutrino mass remains undetermined. Direct kinetic approaches rely on the high-resolution measurement of the beta decay electron spectrum close to its endpoint. The current state-of-the-art MAC-E filter technique is not scalable to larger sources and statistics; therefore, the cyclotron radiation emission spectroscopy (CRES) method has been proposed as an alternative method with potentially greater sensitivity reach. For CRES, the beta-decay electron emits cyclotron radiation in a magnetic mirror trap. The radiation is picked up by receivers, amplified and digitized. For competitive neutrino mass searches, the CRES technique must be scaled up and demonstrated in large-scale volumes. The signal structure from the measured electron radiation is complex, and the impact of apparatus design choices, e.g. the magnetic trap shape, is not straightforward. Therefore, we apply a likelihood-based reconstruction method to investigate the likelihood landscape with simulated data in the region around the Monte Carlo truth to extract the complete information encoded in the signal. As an example, we discuss the impact of magnetic trap designs on the energy resolution obtained by the likelihood reconstruction.

Keywords: Neutrino Mass; Cyclotron Radiation Emission Spectroscopy; Likelihood Reconstruction; Magnetic Field