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Your search keyword '"K. Gauda"' showing total 3 results
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3 results on '"K. Gauda"'

1. Search for keV-scale sterile neutrinos with the first KATRIN data

Author

M. Aker, D. Batzler, A. Beglarian, J. Behrens, A. Berlev, U. Besserer, B. Bieringer, F. Block, S. Bobien, B. Bornschein, L. Bornschein, M. Böttcher, T. Brunst, T. S. Caldwell, S. Chilingaryan, W. Choi, K. Debowski, M. Descher, D. Díaz Barrero, P. J. Doe, O. Dragoun, G. Drexlin, F. Edzards, K. Eitel, E. Ellinger, R. Engel, S. Enomoto, A. Felden, J. A. Formaggio, F. M. Fränkle, G. B. Franklin, F. Friedel, A. Fulst, K. Gauda, A. S. Gavin, W. Gil, F. Glück, R. Grössle, R. Gumbsheimer, V. Hannen, N. Haußmann, K. Helbing, S. Hickford, R. Hiller, D. Hillesheimer, D. Hinz, T. Höhn, T. Houdy, A. Huber, A. Jansen, C. Karl, J. Kellerer, M. Kleifges, M. Klein, C. Köhler, L. Köllenberger, A. Kopmann, M. Korzeczek, A. Kovalík, B. Krasch, H. Krause, L. La Cascio, T. Lasserre, T. L. Le, O. Lebeda, B. Lehnert, A. Lokhov, M. Machatschek, E. Malcherek, M. Mark, A. Marsteller, E. L. Martin, C. Melzer, S. Mertens, J. Mostafa, K. Müller, H. Neumann, S. Niemes, P. Oelpmann, D. S. Parno, A. W. P. Poon, J. M. L. Poyato, F. Priester, J. Ráliš, S. Ramachandran, R. G. H. Robertson, W. Rodejohann, C. Rodenbeck, M. Röllig, C. Röttele, M. Ryšavý, R. Sack, A. Saenz, R. Salomon, P. Schäfer, L. Schimpf, M. Schlösser, K. Schlösser, L. Schlüter, S. Schneidewind, M. Schrank, A. Schwemmer, M. Šefǧík, V. Sibille, D. Siegmann, M. Slezák, F. Spanier, M. Steidl, M. Sturm, H. H. Telle, L. A. Thorne, T. Thümmler, N. Titov, I. Tkachev, K. Urban, K. Valerius, D. Vénos, A. P. Vizcaya Hernández, C. Weinheimer, S. Welte, J. Wendel, M. Wetter, C. Wiesinger, J. F. Wilkerson, J. Wolf, S. Wüstling, J. Wydra, W. Xu, S. Zadoroghny, and G. Zeller

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract In this work we present a keV-scale sterile-neutrino search with a low-tritium-activity data set of the KATRIN experiment, acquired in a commissioning run in 2018. KATRIN performs a spectroscopic measurement of the tritium $$\upbeta $$ β -decay spectrum with the main goal of directly determining the effective electron anti-neutrino mass. During this commissioning phase a lower tritium activity facilitated the measurement of a wider part of the tritium spectrum and thus the search for sterile neutrinos with a mass of up to $$1.6\, \textrm{keV}$$ 1.6 keV . We do not find a signal and set an exclusion limit on the sterile-to-active mixing amplitude of $$\sin ^2\theta < 5\times 10^{-4}$$ sin 2 θ < 5 × 10 - 4 ( $$95\%$$ 95 % C.L.) at a mass of 0.3 keV. This result improves current laboratory-based bounds in the sterile-neutrino mass range between 0.1 and 1.0 keV.

Published
2023
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2. An active transverse energy filter to differentiate low energy particles with large pitch angles in a strong magnetic field

Author

K. Gauda, S. Schneidewind, G. Drexlin, A. Fulst, V. Hannen, T. König, A. Lokhov, P. Oelpmann, H.-W. Ortjohann, W. Pernice, R. G. H. Robertson, R. W. J. Salomon, M. Stappers, and C. Weinheimer

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract We present the idea and proof of principle measurements for an angular-selective active filter for charged particles. The motivation for the setup arises from the need to distinguish background electrons from signal electrons in a spectrometer of MAC-E filter type. While a large fraction of the background electrons exhibit predominantly small angles relative to the magnetic guiding field (corresponding to a low amount of kinetic energy in the motion component transverse to the field lines, in the following referred to as transverse energy) and pass the filter mostly unhindered, signal electrons from an isotropically emitting source interact with the active filter and are detected. The concept is demonstrated using a microchannel plate (MCP) as an active filter element. When correctly aligned with the magnetic field, electrons with a small transverse energy pass the channels of the MCP without interaction while electrons with large transverse energies hit the channel walls and trigger an avalanche of secondary electrons that is subsequently detected. Due to several drawbacks of MCPs for an actual transverse energy filter, an alternative detection technique using microstructured Si-PIN diodes is proposed.

Published
2022
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3. New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs.

Author

Aker M, Batzler D, Beglarian A, Behrens J, Berlev A, Besserer U, Bieringer B, Block F, Bobien S, Bornschein B, Bornschein L, Böttcher M, Brunst T, Caldwell TS, Carney RMD, Chilingaryan S, Choi W, Debowski K, Descher M, Díaz Barrero D, Doe PJ, Dragoun O, Drexlin G, Edzards F, Eitel K, Ellinger E, Engel R, Enomoto S, Felden A, Formaggio JA, Fränkle FM, Franklin GB, Friedel F, Fulst A, Gauda K, Gavin AS, Gil W, Glück F, Grössle R, Gumbsheimer R, Hannen V, Haußmann N, Helbing K, Hickford S, Hiller R, Hillesheimer D, Hinz D, Höhn T, Houdy T, Huber A, Jansen A, Karl C, Kellerer F, Kellerer J, Kleifges M, Klein M, Köhler C, Köllenberger L, Kopmann A, Korzeczek M, Kovalík A, Krasch B, Krause H, La Cascio L, Lasserre T, Le TL, Lebeda O, Lehnert B, Lokhov A, Machatschek M, Malcherek E, Mark M, Marsteller A, Martin EL, Melzer C, Mertens S, Mostafa J, Müller K, Neumann H, Niemes S, Oelpmann P, Parno DS, Poon AWP, Poyato JML, Priester F, Ráliš J, Ramachandran S, Robertson RGH, Rodejohann W, Rodenbeck C, Röllig M, Röttele C, Ryšavý M, Sack R, Saenz A, Salomon R, Schäfer P, Schimpf L, Schlösser M, Schlösser K, Schlüter L, Schneidewind S, Schrank M, Schwemmer A, Šefčík M, Sibille V, Siegmann D, Slezák M, Spanier F, Steidl M, Sturm M, Telle HH, Thorne LA, Thümmler T, Titov N, Tkachev I, Urban K, Valerius K, Vénos D, Vizcaya Hernández AP, Weinheimer C, Welte S, Wendel J, Wiesinger C, Wilkerson JF, Wolf J, Wüstling S, Wydra J, Xu W, Zadoroghny S, and Zeller G

Abstract

We report on the direct search for cosmic relic neutrinos using data acquired during the first two science campaigns of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity molecular tritium gas source are analyzed by a high-resolution MAC-E filter around the end point at 18.57 keV. The analysis is sensitive to a local relic neutrino overdensity ratio of η<9.7×10^{10}/α (1.1×10^{11}/α) at a 90% (95%) confidence level with α=1 (0.5) for Majorana (Dirac) neutrinos. A fit of the integrated electron spectrum over a narrow interval around the end point accounting for relic neutrino captures in the tritium source reveals no significant overdensity. This work improves the results obtained by the previous neutrino mass experiments at Los Alamos and Troitsk. We furthermore update the projected final sensitivity of the KATRIN experiment to η<1×10^{10}/α at 90% confidence level, by relying on updated operational conditions.

Published
2022
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