First direct neutrino-mass measurement with sub-eV sensitivity

arXiv: High Energy Physics - Experiment Pub Date : 2021-05-18 DOI:10.21203/RS.3.RS-544214/V1

M. Aker, M. Bottcher, A. Beglarian, J. Behrens, A. Berlev, U. Besserer, B. Bieringer, F. Block, B. Bornschein, L. Bornschein, T. Brunst, T. Caldwell, R. Carney, L. L. Cascio, S. Chilingaryan, W. Choi, K. Debowski, M. Deffert, M. Descher, D. D. Barrero, P. Doe, O. Dragouns, G. Drexlin, K. Eitel, E. Ellinger, R. Engel, S. Enomoto, A. Felden, J. Formaggio, F. Frankle, G. Franklin, F. Friedel, A. Fulst, K. Gauda, W. Gil, F. Gluck, R. Grossle, R. Gumbsheimer, V. Gupta, T. Hohn, V. Hannen, N. Haussmann, K. Helbing, S. Hickford, R. Hiller, D. Hillsheimer, D. Hinz, T. Houdy, A. Huber, A. Jansen, C. Karl, F. Kellerer, J. Kellerer, M. Klein, C. Kohler, L. Kollenberger, A. Kopmann, M. Korzeczek, A. Kovalík, B. Krasch, H. Krause, N. Kunka, T. Lasserre, T. Le, O. Lebeda, B. Lehnert, A. Lokhov, M. Machatschek, E. Malcherek, M. Mark, A. Marsteller, E. Martín, C. Melzer, A. Menshikov, S. Mertens, S. Mertens, J. Mostafa, K. Muller, S. Niemes, P. Oelpmann, D. Parno, A. Poon, J. Poyato, F. Priester, M. Rollig, C. Rottele, R

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引用次数: 56

Abstract

We report the results of the second measurement campaign of the Karlsruhe Tritium Neutrino (KATRIN) experiment. KATRIN probes the effective electron anti-neutrino mass, mν, via a high-precision measurement of the tritium β-decay spectrum close to its endpoint at 18.6 keV. In the second physics run presented here, the source activity was increased by a factor of 3.8 and the background was reduced by 25% with respect to the first campaign. A sensitivity on mν of 0.7 eV/c2 at 90% confidence level (CL) was reached. This is the first sub-eV sensitivity from a direct neutrino-mass experiment. The best fit to the spectral data yields mν2=(0.26±0.34) eV2/c4, resulting in an upper limit of mν<0.9 eV/c2 (90% CL). By combining this result with the first neutrino mass campaign, we find an upper limit of mν<0.8 eV/c2 (90% CL).

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首次用亚电子伏灵敏度直接测量中微子质量

我们报告了卡尔斯鲁厄氚中微子(KATRIN)实验第二次测量活动的结果。KATRIN通过高精度测量氚β衰变谱在18.6 keV的端点附近探测有效电子反中微子质量(mν)。在这里展示的第二次物理运行中，相对于第一次战役，源活动增加了3.8倍，背景减少了25%。在90%置信水平(CL)下，对mν的灵敏度达到0.7 eV/c2。这是首次从直接中微子质量实验中获得亚电子伏灵敏度。与光谱数据的最佳拟合结果为mν2=(0.26±0.34)eV2/c4，上限为mν<0.9 eV/c2 (90% CL)。通过将这一结果与第一次中微子质量运动相结合，我们发现mν<0.8 eV/c2 (90% CL)的上限。

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arXiv: High Energy Physics - Experiment

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