| Article | |
| Report number | arXiv:2011.05107 |
| Title | KATRIN background due to surface radioimpurities |
| Author(s) |
Fränkle, Florian (KIT, Karlsruhe, IAP) ; Schaller, Anna (Munich, Tech. U. ; Munich, Max Planck Inst.) ; Blaum, Klaus (Heidelberg, Max Planck Inst.) ; Otten, Ernst (Mainz U., Inst. Phys.) ; Bornschein, Lutz (KIT, Karlsruhe, IAP) ; Drexlin, Guido (KIT, Karlsruhe, EKP) ; Glück, Ferenc (KIT, Karlsruhe, IAP) ; Hannen, Volker (Munster U.) ; Harms, Fabian (KIT, Karlsruhe, EKP) ; Hinz, Dominic (KIT, Karlsruhe, IAP) ; Johnston, Karl (CERN) ; Karthein, Jonas (CERN ; Heidelberg, Max Planck Inst.) ; Köster, Ulli (Laue-Langevin Inst.) ; Lokhov, Alexey (Munster U.) ; Mertens, Susanne (Munich, Tech. U. ; Munich, Max Planck Inst.) ; Müller, Frank (Heidelberg, Max Planck Inst.) ; Osipowicz, Alexander (Fulda, Fachhochsch.) ; Ranitzsch, Philipp (Munster U.) ; Schlösser, Klaus (KIT, Karlsruhe, IAP) ; Thümmler, Thomas (KIT, Karlsruhe, IAP) ; Trost, Nikolaus (KIT, Karlsruhe, IAP) ; Weinheimer, Christian (Munster U.) ; Wolf, Joachim (KIT, Karlsruhe, EKP) |
| Publication | 2022-05 |
| Imprint | 2020-11-10 |
| Number of pages | 11 |
| In: | Astropart. Phys. 138 (2022) 102686 |
| DOI | 10.1016/j.astropartphys.2022.102686 (publication) |
| Subject category | hep-ex ; Particle Physics - Experiment ; physics.ins-det ; Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | KATRIN |
| Abstract | The goal of the KArlsruhe TRItrium Neutrino (KATRIN) experiment is the determination of the effective electron antineutrino mass with a sensitivity of 0.2 eV/c$^2$ at 90% C.L. This goal can only be achieved with a very low background level in the order of 0.01 counts per second. A possible background source is $\alpha$-decays on the inner surface of the KATRIN Main Spectrometer. Two $\alpha$-sources, $^{223}$Ra and $^{228}$Th, were installed at the KATRIN Main Spectrometer with the purpose of temporarily increasing the background in order to study $\alpha$-decay induced background processes. In this paper, we present a possible background generation mechanism and measurements performed with these two radioactive sources. Our results show a clear correlation between $\alpha$-activity on the inner spectrometer surface and background from the volume of the spectrometer. Two key characteristics of the Main Spectrometer background -the dependency on the inner electrode offset potential, and the radial distribution - could be reproduced with this artificially induced background. These findings indicate a high contribution of $\alpha$-decay induced events to the residual KATRIN background. |
| Copyright/License | publication: © 2022-2024 The Authors (License: CC BY 4.0) preprint: (License: arXiv nonexclusive-distrib 1.0) |
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