Precision measurement and modelling of the threshold-free 210Pb β spectrum
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866918152186626048 |
|---|---|
| author | Zhang, Shuo Liu, Hao-Ran Han, Ke Mougeot, Xavier Hervieux, Paul-Antoine Sun, Tao Wu, Wen-Tao Cantor, Robin Xia, Jing-Kai Liu, Zhi Liang, Jun-Cheng Fan, Fu-You Zhang, Le Ge, Ming-Yu Zhou, Xiao-Peng Andoche, Adrien |
| author_facet | Zhang, Shuo Liu, Hao-Ran Han, Ke Mougeot, Xavier Hervieux, Paul-Antoine Sun, Tao Wu, Wen-Tao Cantor, Robin Xia, Jing-Kai Liu, Zhi Liang, Jun-Cheng Fan, Fu-You Zhang, Le Ge, Ming-Yu Zhou, Xiao-Peng Andoche, Adrien |
| contents | Beta decay is a fundamental process that governs nuclear stability and serves as a sensitive probe of the weak interaction and possible physics beyond the Standard Model of particle physics. However, precise measurements of complete $β$ decay spectra, particularly at low energies, remain experimentally and theoretically challenging. Here we report a high-precision, threshold-free measurement of the full $β$ decay spectrum of 210Pb to excited states of 210Bi, using a transition-edge sensor (TES)-based micro-calorimeter. This approach enables the detection of $β$ particle energies from 0 keV up to their endpoint by coincidence summing with subsequent de-excitation energy, thereby eliminating reconstruction artifacts near zero energy that have traditionally limited low-energy spectral accuracy. To our knowledge, this is the first complete, high-precision $β$ decay spectrum from 0 keV. The data resolve theoretical uncertainties associated with the atomic quantum exchange (AQE) effect. An accompanying ab initio theoretical framework, incorporating atomic, leptonic, and nuclear components, predicts a statistically significant (7.2 {$σ$}) enhancement in $β$ emission probability near zero energy, in agreement with the measurement and in contrast to models that omit AQE corrections. These results provide a new benchmark for $β$ decay theory at low energies, deepen our understanding of the weak interaction, and establish a critical foundation for searches for new physics, including dark matter interactions and precision studies of neutrinos. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_26390 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Precision measurement and modelling of the threshold-free 210Pb β spectrum Zhang, Shuo Liu, Hao-Ran Han, Ke Mougeot, Xavier Hervieux, Paul-Antoine Sun, Tao Wu, Wen-Tao Cantor, Robin Xia, Jing-Kai Liu, Zhi Liang, Jun-Cheng Fan, Fu-You Zhang, Le Ge, Ming-Yu Zhou, Xiao-Peng Andoche, Adrien Nuclear Experiment Nuclear Theory Instrumentation and Detectors Beta decay is a fundamental process that governs nuclear stability and serves as a sensitive probe of the weak interaction and possible physics beyond the Standard Model of particle physics. However, precise measurements of complete $β$ decay spectra, particularly at low energies, remain experimentally and theoretically challenging. Here we report a high-precision, threshold-free measurement of the full $β$ decay spectrum of 210Pb to excited states of 210Bi, using a transition-edge sensor (TES)-based micro-calorimeter. This approach enables the detection of $β$ particle energies from 0 keV up to their endpoint by coincidence summing with subsequent de-excitation energy, thereby eliminating reconstruction artifacts near zero energy that have traditionally limited low-energy spectral accuracy. To our knowledge, this is the first complete, high-precision $β$ decay spectrum from 0 keV. The data resolve theoretical uncertainties associated with the atomic quantum exchange (AQE) effect. An accompanying ab initio theoretical framework, incorporating atomic, leptonic, and nuclear components, predicts a statistically significant (7.2 {$σ$}) enhancement in $β$ emission probability near zero energy, in agreement with the measurement and in contrast to models that omit AQE corrections. These results provide a new benchmark for $β$ decay theory at low energies, deepen our understanding of the weak interaction, and establish a critical foundation for searches for new physics, including dark matter interactions and precision studies of neutrinos. |
| title | Precision measurement and modelling of the threshold-free 210Pb β spectrum |
| topic | Nuclear Experiment Nuclear Theory Instrumentation and Detectors |
| url | https://arxiv.org/abs/2509.26390 |