Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 53: Neutrino physics 6

T 53.2: Vortrag

Mittwoch, 6. März 2024, 16:15–16:30, Geb. 20.30: 2.058

Mitigation of rear wall backscattering for keV sterile neutrino search at KATRIN — •Kerstin Trost — Karlsruhe Institute of Technology (KIT)

The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to determine the absolute neutrino mass scale by measuring the endpoint region of the tritium β-decay spectrum with high precision. Furthermore, a measurement of the differential spectrum to energies deep below the endpoint will be conducted using the new TRISTAN detector. This enables the search for keV-scale sterile neutrinos that would cause subtle distortions several keV below the endpoint. The differential spectrum measurement requires modifications to the beamline setup, and it is subject to many new systematics.
This talk focuses on strategies to minimize the leading systematic effect of rear wall backscattering. Various scenarios are explored with simulations, including the selection of the rear wall material and the influence of magnetic fields at the rear wall and along the beamline. The primary objective is to identify an optimized beamline configuration that significantly enhances sensitivity for the detection of keV-scale sterile neutrinos.
This work is supported by the Helmholtz Association and by the Ministry for Education and Research BMBF (grant numbers 05A23PMA, 05A23PX2, 05A23VK2, and 05A23WO6).

Keywords: KATRIN; TRISTAN; Systematics; Sterile; Neutrino