Ponente
Descripción
The Project 8 collaboration is seeking a direct measurement of the absolute neutrino mass scale from the distortion of the tritium beta decay spectrum near the endpoint with a sensitivity of $\sim 40\,\mathrm{meV/c^2}$. To this end, the collaboration has successfully established CRES, a frequency-based approach to detect electrons and determine their kinetic energy. This talk will present the data and analysis of the first tritium spectrum recorded using the CRES technique. The spectrum shows no events beyond the endpoint, demonstrating the ultra-low background obtainable with this technology. This talk will further report on the improved energy resolution and the influence of the main systematic error sources on the shape of the measured spectrum and the tritium endpoint determination.
This work is supported by the US DOE Office of Nuclear Physics, the US NSF, the PRISMA+ Cluster of Excellence at the University of Mainz, and internal investments at all institutions.
