Gamma-induced background in the KATRIN main spectrometer

0509890 - ÚJF 2020 RIV DE eng J - Článek v odborném periodiku
Altenmuller, K. - Arenz, M. - Baek, W. -J. - Beck, M. - Beglarian, A. - Behrens, J. - Dragoun, Otokar - Kovalík, Alojz - Lebeda, Ondřej - Ryšavý, Miloš - Suchopár, Martin - Vénos, Drahoslav … celkem 126 autorů
Gamma-induced background in the KATRIN main spectrometer.
European Physical Journal C. Roč. 79, č. 9 (2019), č. článku 807. ISSN 1434-6044. E-ISSN 1434-6052
Grant CEP: GA MŠMT LM2015056; GA MŠMT LTT18021; GA MŠMT LTT19005
Institucionální podpora: RVO:61389005
Klíčová slova: KATRIN spectrometer * rate of background * main spectrometer
Obor OECD: Particles and field physics
Impakt faktor: 4.389, rok: 2019
Způsob publikování: Open access
https://doi.org/10.1140/epjc/s10052-019-7320-4

he KATRIN experiment aims to measure the effective electron antineutrino mass m nu over bar e with a sensitivity of 0.2eV/c2 using a gaseous tritium source combined with the MAC-E filter technique. A low background rate is crucial to achieving the proposed sensitivity, and dedicated measurements have been performed to study possible sources of background electrons. In this work, we test the hypothesis that gamma radiation from external radioactive sources significantly increases the rate of background events created in the main spectrometer (MS) and observed in the focal-plane detector. Using detailed simulations of the gamma flux in the experimental hall, combined with a series of experimental tests that artificially increased or decreased the local gamma flux to the MS, we set an upper limit of 0.006count/s (90% C.L.) from this mechanism. Our results indicate the effectiveness of the electrostatic and magnetic shielding used to block secondary electrons emitted from the inner surface of the MS.
Trvalý link: http://hdl.handle.net/11104/0300479