Magneto-$ν$: Heavy neutral lepton search using $^{241}$Pu $β^-$ decays
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866917310854332416 |
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| author | Lee, C. Zhang, X. Kavner, A. Parsons-Davis, T. Lee, D. Hines, N. Boyd, S. T. P. Loidl, M. Mougeot, X. Rodrigues, M. Lee, M. K. Song, J. Wood, R. Jovanovic, I. Kim, G. B. |
| author_facet | Lee, C. Zhang, X. Kavner, A. Parsons-Davis, T. Lee, D. Hines, N. Boyd, S. T. P. Loidl, M. Mougeot, X. Rodrigues, M. Lee, M. K. Song, J. Wood, R. Jovanovic, I. Kim, G. B. |
| contents | The MAGNETO-$ν$ experiment searches for keV-scale heavy neutral leptons (HNLs) through precise measurements of the $β^-$-decay spectrum of $^{241}$Pu. We present spectra comprising a total of 194 million $β^-$ decays recorded using decay energy spectrometry with metallic magnetic calorimeters, representing the most statistically precise measurement of $^{241}$Pu $β^-$ decay to date. The $β$-endpoint energy was determined using $γ$ rays and X rays from an external $^{133}$Ba calibration source, yielding $Q_β= 22.273\,(33)$\,keV. The measured spectrum shows no statistically significant deviation from the allowed $β$-decay model. From a subset of the high-statistics data, we set an upper limit on the mixing of an 11.5-keV HNL with the electron neutrino, $|U_{e4}|^2 < 1.31 \times 10^{-3}$ at the 95\% confidence level. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_18350 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Magneto-$ν$: Heavy neutral lepton search using $^{241}$Pu $β^-$ decays Lee, C. Zhang, X. Kavner, A. Parsons-Davis, T. Lee, D. Hines, N. Boyd, S. T. P. Loidl, M. Mougeot, X. Rodrigues, M. Lee, M. K. Song, J. Wood, R. Jovanovic, I. Kim, G. B. High Energy Physics - Experiment Nuclear Experiment The MAGNETO-$ν$ experiment searches for keV-scale heavy neutral leptons (HNLs) through precise measurements of the $β^-$-decay spectrum of $^{241}$Pu. We present spectra comprising a total of 194 million $β^-$ decays recorded using decay energy spectrometry with metallic magnetic calorimeters, representing the most statistically precise measurement of $^{241}$Pu $β^-$ decay to date. The $β$-endpoint energy was determined using $γ$ rays and X rays from an external $^{133}$Ba calibration source, yielding $Q_β= 22.273\,(33)$\,keV. The measured spectrum shows no statistically significant deviation from the allowed $β$-decay model. From a subset of the high-statistics data, we set an upper limit on the mixing of an 11.5-keV HNL with the electron neutrino, $|U_{e4}|^2 < 1.31 \times 10^{-3}$ at the 95\% confidence level. |
| title | Magneto-$ν$: Heavy neutral lepton search using $^{241}$Pu $β^-$ decays |
| topic | High Energy Physics - Experiment Nuclear Experiment |
| url | https://arxiv.org/abs/2503.18350 |