Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 18: Neutrino physics without accelerators I

T 18.6: Vortrag

Montag, 15. März 2021, 17:20–17:35, Tr

Atomic hydrogen beam monitor for Project 8 — •Christian Matthe and Sebastian Böser for the Project 8 collaboration — PRISMA+ Cluster of Excellence, JGU Mainz

The Project 8 collaboration aims to determine the absolute neutrino mass to a precision of 40 meV by measuring the tritium decay spectrum around the endpoint energy. For this level of precision it is necessary to use atomic tritium, since molecular tritium sensitivity is limited by the final molecular state distribution to about 100 meV. We anticipate using an atomic tritium flux of ≈10¹⁹ atoms/s from the source to inject a beam with ≈ 10¹⁵ atoms/s of the proper state and temperature into the detection volume.

For monitoring this beam, we envision a detector that uses a wire with a micrometer-scale diameter intersecting the beam on which a small fraction of the beam’s hydrogen atoms recombine into molecules. The energy released heats the wire and produces a measurable change in its resistance. Using either a grid of wires or a sweep with a single wire the beam profile could be determined. Thanks to the wires’ minimal area, such a detector is suitable for both development work and for online monitoring in the final experiment. In this talk I will present first results from such a detector designed for the Mainz atomic hydrogen setup.