Shake-up and shake-off spectra in the electron capture decay of atomic $^7$Be
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arXiv
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| Natura: | Preprint |
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2026
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| author | Guerra, Mauro Kim, Inwook Friedrich, Stephan Amaro, Pedro Andoche, Adrien Baptista, Gonçalo Bray, Connor Cantor, Robin Diercks, David Fretwell, Spencer L. Gillespie, Abigail Hall, Ad Harris, Cameron N. Harris, Jackson T. Hayen, Leendert M. Hervieux, Paul Antoine Indelicato, Paul Kim, Geon Bo Leach, Kyle G. Lennarz, Annika Lordi, Vincenzo Machule, Peter Marino, Andrew McKeen, David Mougeot, Xavier Pinheiro, Daniel Ponce, Francisco Ruiz, Chris Samanta, Amit Santos, José Paulo Smolsky, Joseph Stone-Whitehead, Caitlyn Templet, Joseph Warburton, William K. Waters, Benjamin Machado, Jorge |
| author_facet | Guerra, Mauro Kim, Inwook Friedrich, Stephan Amaro, Pedro Andoche, Adrien Baptista, Gonçalo Bray, Connor Cantor, Robin Diercks, David Fretwell, Spencer L. Gillespie, Abigail Hall, Ad Harris, Cameron N. Harris, Jackson T. Hayen, Leendert M. Hervieux, Paul Antoine Indelicato, Paul Kim, Geon Bo Leach, Kyle G. Lennarz, Annika Lordi, Vincenzo Machule, Peter Marino, Andrew McKeen, David Mougeot, Xavier Pinheiro, Daniel Ponce, Francisco Ruiz, Chris Samanta, Amit Santos, José Paulo Smolsky, Joseph Stone-Whitehead, Caitlyn Templet, Joseph Warburton, William K. Waters, Benjamin Machado, Jorge |
| contents | The most stringent laboratory-based experimental limits on the existence of sub-MeV sterile neutrinos are currently set by decay spectroscopy of radioactive $^7$Be embedded into superconducting sensors. The systematic uncertainties are dominated by the modeling of the electron shake-up and shake-off spectra that are not based on state-of-the-art atomic theory and do not include electron correlations or relativistic effects. We have used the multiconfiguration Dirac-Fock formalism to obtain correlated wavefunctions ab initio and compute all single and double shake processes in the electron capture decay of atomic $^7$Be. The simulations can explain some but not all of the observed spectral features, likely because the wave functions are modified by the Ta sensor material that the $^7$Be is embedded into. The new models also show that the L/K electron capture ratio of $^7$Be in Ta has previously been slightly underestimated revising the previous value of 0.070(7) to a new value of 0.0756(20). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_16756 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Shake-up and shake-off spectra in the electron capture decay of atomic $^7$Be Guerra, Mauro Kim, Inwook Friedrich, Stephan Amaro, Pedro Andoche, Adrien Baptista, Gonçalo Bray, Connor Cantor, Robin Diercks, David Fretwell, Spencer L. Gillespie, Abigail Hall, Ad Harris, Cameron N. Harris, Jackson T. Hayen, Leendert M. Hervieux, Paul Antoine Indelicato, Paul Kim, Geon Bo Leach, Kyle G. Lennarz, Annika Lordi, Vincenzo Machule, Peter Marino, Andrew McKeen, David Mougeot, Xavier Pinheiro, Daniel Ponce, Francisco Ruiz, Chris Samanta, Amit Santos, José Paulo Smolsky, Joseph Stone-Whitehead, Caitlyn Templet, Joseph Warburton, William K. Waters, Benjamin Machado, Jorge Atomic Physics The most stringent laboratory-based experimental limits on the existence of sub-MeV sterile neutrinos are currently set by decay spectroscopy of radioactive $^7$Be embedded into superconducting sensors. The systematic uncertainties are dominated by the modeling of the electron shake-up and shake-off spectra that are not based on state-of-the-art atomic theory and do not include electron correlations or relativistic effects. We have used the multiconfiguration Dirac-Fock formalism to obtain correlated wavefunctions ab initio and compute all single and double shake processes in the electron capture decay of atomic $^7$Be. The simulations can explain some but not all of the observed spectral features, likely because the wave functions are modified by the Ta sensor material that the $^7$Be is embedded into. The new models also show that the L/K electron capture ratio of $^7$Be in Ta has previously been slightly underestimated revising the previous value of 0.070(7) to a new value of 0.0756(20). |
| title | Shake-up and shake-off spectra in the electron capture decay of atomic $^7$Be |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2601.16756 |