Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 78: Experimental Techniques in Astroparticle Physics 3
T 78.2: Vortrag
Mittwoch, 23. März 2022, 16:30–16:45, T-H37
Measuring the liquid xenon scintillation pulse shape and its electric field dependence — •Dominick Cichon1, Guillaume Eurin1,2, Florian Jörg1, Teresa Marrodán Undagoitia1, and Natascha Rupp1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
In the search for new physics, such as particle dark matter and the neutrinoless double-beta decay, liquid xenon (LXe) detectors play an important role and have provided highly competitive results over the past years. As an example, XENON1T, which utilized a LXe time projection chamber (TPC), constrained the cross-section for interactions between weakly interacting massive particles (WIMPs) and nucleons to values below 4.1 · 10−47 cm2 at a WIMP mass of 30 GeV/c2. To push LXe detector technology to its limits and achieve even better sensitivities, a detailed understanding of the microphysics processes responsible for signal generation in LXe is necessary. One avenue to investigate such processes is the pulse shape of the prompt scintillation signal caused by excitation of LXe via particle interactions.
This talk presents measurements of the LXe scintillation pulse shape after excitation by either electrons from the isomeric transition of 83mKr or alpha particles from 222Rn chain decays. For both sources, the pulse shape has been characterized at more than 25 different electric field configurations between ∼ 0 V/cm and ∼ 1200 V/cm. The results are compared to previoulsy published data and interpreted in the context of the involved microphysics processes.