首次用亚电子伏灵敏度直接测量中微子质量

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

摘要

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。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
First direct neutrino-mass measurement with sub-eV sensitivity
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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