학술논문
Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN
Document Type
article
Author
Aker, M; Altenmüller, K; Arenz, M; Babutzka, M; Barrett, J; Bauer, S; Beck, M; Beglarian, A; Behrens, J; Bergmann, T; Besserer, U; Blaum, K; Block, F; Bobien, S; Bokeloh, K; Bonn, J; Bornschein, B; Bornschein, L; Bouquet, H; Brunst, T; Caldwell, TS; La Cascio, L; Chilingaryan, S; Choi, W; Corona, TJ; Debowski, K; Deffert, M; Descher, M; Doe, PJ; Dragoun, O; Drexlin, G; Dunmore, JA; Dyba, S; Edzards, F; Eisenblätter, L; Eitel, K; Ellinger, E; Engel, R; Enomoto, S; Erhard, M; Eversheim, D; Fedkevych, M; Felden, A; Fischer, S; Flatt, B; Formaggio, JA; Fränkle, FM; Franklin, GB; Frankrone, H; Friedel, F; Fuchs, D; Fulst, A; Furse, D; Gauda, K; Gemmeke, H; Gil, W; Glück, F; Görhardt, S; Groh, S; Grohmann, S; Grössle, R; Gumbsheimer, R; Minh, M Ha; Hackenjos, M; Hannen, V; Harms, F; Hartmann, J; Haußmann, N; Heizmann, F; Helbing, K; Hickford, S; Hilk, D; Hillen, B; Hillesheimer, D; Hinz, D; Höhn, T; Holzapfel, B; Holzmann, S; Houdy, T; Howe, MA; Huber, A; James, TM; Jansen, A; Kaboth, A; Karl, C; Kazachenko, O; Kellerer, J; Kernert, N; Kippenbrock, L; Kleesiek, M; Klein, M; Köhler, C; Köllenberger, L; Kopmann, A; Korzeczek, M; Kosmider, A; Kovalík, A; Krasch, B; Kraus, M; Krause, H
Source
Physical Review Letters. 123(22)
Subject
Language
Abstract
We report on the neutrino mass measurement result from the first four-week science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are energy analyzed by a high-resolution MAC-E filter. A fit of the integrated electron spectrum over a narrow interval around the kinematic end point at 18.57 keV gives an effective neutrino mass square value of (-1.0_{-1.1}^{+0.9}) eV^{2}. From this, we derive an upper limit of 1.1 eV (90% confidence level) on the absolute mass scale of neutrinos. This value coincides with the KATRIN sensitivity. It improves upon previous mass limits from kinematic measurements by almost a factor of 2 and provides model-independent input to cosmological studies of structure formation.