Direct neutrino-mass measurement with sub-electronvolt sensitivity
Since the discovery of neutrino oscillations, we know that neutrinos have non-zero mass. However, the absolute neutrino-mass scale remains unknown. Here we report the upper limits on effective electron anti-neutrino mass, mν, from the second physics run of the Karlsruhe Tritium Neutrino experiment....
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| Format: | Article |
| Language: | English |
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Springer Science and Business Media LLC
2022
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| Online Access: | https://hdl.handle.net/1721.1/141776 |
| _version_ | 1826189952195493888 |
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| author | Formaggio, Joseph |
| author2 | Massachusetts Institute of Technology. Laboratory for Nuclear Science |
| author_facet | Massachusetts Institute of Technology. Laboratory for Nuclear Science Formaggio, Joseph |
| author_sort | Formaggio, Joseph |
| collection | MIT |
| description | Since the discovery of neutrino oscillations, we know that neutrinos have non-zero mass. However, the absolute neutrino-mass scale remains unknown. Here we report the upper limits on effective electron anti-neutrino mass, mν, from the second physics run of the Karlsruhe Tritium Neutrino experiment. In this experiment, mν is probed via a high-precision measurement of the tritium β-decay spectrum close to its endpoint. This method is independent of any cosmological model and does not rely on assumptions whether the neutrino is a Dirac or Majorana particle. By increasing the source activity and reducing the background with respect to the first physics campaign, we reached a sensitivity on mν of 0.7 eV c–2 at a 90% confidence level (CL). The best fit to the spectral data yields m2ν = (0.26 ± 0.34) eV2 c–4, resulting in an upper limit of mν < 0.9 eV c–2 at 90% CL. By combining this result with the first neutrino-mass campaign, we find an upper limit of mν < 0.8 eV c–2 at 90% CL. |
| first_indexed | 2024-09-23T08:31:56Z |
| format | Article |
| id | mit-1721.1/141776 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:31:56Z |
| publishDate | 2022 |
| publisher | Springer Science and Business Media LLC |
| record_format | dspace |
| spelling | mit-1721.1/1417762023-04-19T19:09:59Z Direct neutrino-mass measurement with sub-electronvolt sensitivity Formaggio, Joseph Massachusetts Institute of Technology. Laboratory for Nuclear Science Since the discovery of neutrino oscillations, we know that neutrinos have non-zero mass. However, the absolute neutrino-mass scale remains unknown. Here we report the upper limits on effective electron anti-neutrino mass, mν, from the second physics run of the Karlsruhe Tritium Neutrino experiment. In this experiment, mν is probed via a high-precision measurement of the tritium β-decay spectrum close to its endpoint. This method is independent of any cosmological model and does not rely on assumptions whether the neutrino is a Dirac or Majorana particle. By increasing the source activity and reducing the background with respect to the first physics campaign, we reached a sensitivity on mν of 0.7 eV c–2 at a 90% confidence level (CL). The best fit to the spectral data yields m2ν = (0.26 ± 0.34) eV2 c–4, resulting in an upper limit of mν < 0.9 eV c–2 at 90% CL. By combining this result with the first neutrino-mass campaign, we find an upper limit of mν < 0.8 eV c–2 at 90% CL. 2022-04-07T19:11:07Z 2022-04-07T19:11:07Z 2022-02 2022-04-07T19:02:37Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/141776 Formaggio, Joseph. 2022. "Direct neutrino-mass measurement with sub-electronvolt sensitivity." Nature Physics, 18 (2). en 10.1038/s41567-021-01463-1 Nature Physics Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Springer Science and Business Media LLC Nature |
| spellingShingle | Formaggio, Joseph Direct neutrino-mass measurement with sub-electronvolt sensitivity |
| title | Direct neutrino-mass measurement with sub-electronvolt sensitivity |
| title_full | Direct neutrino-mass measurement with sub-electronvolt sensitivity |
| title_fullStr | Direct neutrino-mass measurement with sub-electronvolt sensitivity |
| title_full_unstemmed | Direct neutrino-mass measurement with sub-electronvolt sensitivity |
| title_short | Direct neutrino-mass measurement with sub-electronvolt sensitivity |
| title_sort | direct neutrino mass measurement with sub electronvolt sensitivity |
| url | https://hdl.handle.net/1721.1/141776 |
| work_keys_str_mv | AT formaggiojoseph directneutrinomassmeasurementwithsubelectronvoltsensitivity |