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T: Fachverband Teilchenphysik
T 6: Neutrino physics without accelerators I
T 6.4: Vortrag
Montag, 30. März 2020, 17:15–17:30, H-HS IV
Determination of the tritium Q-value with KATRIN — •Rudolf Sack for the KATRIN collaboration — WWU Münster
The Karlsruhe Tritium Neutrino experiment (KATRIN) is
a next generation tritium beta decay experiment. It allows a model independent investigation of the absolute
neutrino mass scale with an estimated sensitivity of 0.2 eV/c2 (90% C.L.).
The KATRIN experiment is sensitive to the absolute energy scale of the T2 beta-decay and can determine the Q-value of tritium beta-decay with sub eV precision. This measured value can be compared to the mass difference of 3He- and T-atoms in Penning traps. This comparison is very important to check the systematic effects of the KATRIN experiment. For the first KATRIN neutrino mass measurement the Q-value determination is still limited by experimental uncertainties, such as work functions and the plasma potential of the source.
The talk presents the Q-value of tritium beta decay which was obtained from a measurement phase in 2019, and discusses the dominant systematic effects and uncertainties in detail.
This work is funded by BMBF (05A17PM3) and by DFG (GRK-2149).