Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN.

M Aker,K Altenmüller, M Arenz, M Babutzka,J Barrett,S Bauer,M Beck,A Beglarian,J Behrens,T Bergmann, U Besserer,K Blaum,F Block, S Bobien,K Bokeloh,J Bonn,B Bornschein,L Bornschein, H Bouquet, T Brunst, T S Caldwell,L La Cascio,S Chilingaryan, W Choi, T J Corona, K Debowski, M Deffert, M Descher, P J Doe, O Dragoun,G Drexlin,J A Dunmore, S Dyba, F Edzards, L Eisenblätter,K Eitel, E Ellinger, R Engel, S Enomoto, M Erhard, D Eversheim,M Fedkevych, A Felden, S Fischer,B Flatt, J A Formaggio, F M Fränkle, G B Franklin, H Frankrone, F Friedel, D Fuchs, A Fulst, D Furse, K Gauda, H Gemmeke,W Gil, F Glück, S Görhardt,S Groh,S Grohmann,R Grössle, R Gumbsheimer,M Ha Minh, M Hackenjos, V Hannen, F Harms,J Hartmann,N Haußmann, F Heizmann, K Helbing, S Hickford, D Hilk, B Hillen, D Hillesheimer, D Hinz,T Höhn,B Holzapfel, S Holzmann, T Houdy, M A Howe,A Huber, T M James, A Jansen, A Kaboth,C Karl,O Kazachenko, J Kellerer,N Kernert, L Kippenbrock, M Kleesiek,M Klein,C Köhler, L Köllenberger,A Kopmann, M Korzeczek,A Kosmider,A Kovalík,B Krasch,M Kraus, H Krause, L Kuckert, B Kuffner,N Kunka, T Lasserre, T L Le,O Lebeda,M Leber,B Lehnert, J Letnev, F Leven, S Lichter, V M Lobashev, A Lokhov, M Machatschek, E Malcherek, K Müller,M Mark,A Marsteller,E L Martin, C Melzer, A Menshikov,S Mertens, L I Minter, S Mirz,B Monreal,P I Morales Guzmán, K Müller,U Naumann, W Ndeke,H Neumann, S Niemes, M Noe,N S Oblath, H-W Ortjohann,A Osipowicz, B Ostrick,E Otten, D S Parno,D G Phillips, P Plischke,A Pollithy, A W P Poon, J Pouryamout, M Prall, F Priester,M Röllig, C Röttele,P C-O Ranitzsch,O Rest, R Rinderspacher, R G H Robertson, C Rodenbeck,P Rohr, Ch Roll,S Rupp,M Ryšavý, R Sack,A Saenz,P Schäfer, L Schimpf, K Schlösser,M Schlösser, L Schlüter, H Schön, K Schönung, M Schrank, B Schulz, J Schwarz, H Seitz-Moskaliuk, W Seller, V Sibille, D Siegmann, A Skasyrskaya, M Slezák, A Špalek,F Spanier, M Steidl,N Steinbrink, M Sturm, M Suesser, M Sun, D Tcherniakhovski, H H Telle, T Thümmler, L A Thorne, N Titov,I Tkachev,N Trost, K Urban, D Vénos,K Valerius, B A VanDevender,R Vianden,A P Vizcaya Hernández, B L Wall, S Wüstling,M Weber,C Weinheimer,C Weiss, S Welte,J Wendel,K J Wierman,J F Wilkerson, J Wolf, W Xu,Y-R Yen, M Zacher, S Zadorozhny, M Zbořil,G Zeller

Physical review letters（2019）

引用 649|浏览4

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摘要

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.

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