Shake-off in the 164Er neutrinoless double electronic capture and the dark matter puzzle

Abstract

Traditionally double neutrinoless electronic capture is considered as a resonance process. We have fulfilled shake-off probability calculations, leading to ionization of the electron shell, in the case of 164Er. Allowance for the shake-off removes the requirement of resonance, leading to a radical increase of the capture rate. In the case of 164Er, the contribution of the new mechanism increases the capture rate by a factor of 5.6 as compared to the conventional resonance fluorescence mechanism. It also increases the probability of electron capture from higher shells, which must be foreseen in the experimental studies. Moreover, the effect of the shake-off can expand the list of candidate nuclei for experimental research. The influence of the shake-off is also expected to manifest itself in the other beta processes which are used in the studies of the neutrino nature, its mass and role in the dark matter puzzle.

arXiv comment16 pages, 6 figures. Delivered as a talk at the 71 International conference NUCLEUS - 2021. Nuclear physics and elementary particle physics. Nuclear physics technologies, September 20 - 25, 2021, Saint-Petersburg, Russia

References in corpus (10)

• Search for Majorana Neutrinos near the Inverted Mass Hierarchy Region with KamLAND-Zen
• Neutrinoless Double-Beta Decay: Status and Prospects
• First Results from CUORE: A Search for Lepton Number Violation via $0\nu \beta \beta$ Decay of ${}^{130}$Te
• Improved limit on neutrinoless double beta decay of ${}^{76}$Ge from GERDA Phase II
• Neutrino-less Double Electron Capture - a tool to research for Majorana neutrinos
• Neutrinoless Double-Electron Capture
• Comparative study of the double $K$-shell-vacancy production in single- and double-electron capture decay
• Direct Neutrino Mass Experiments and Exotic Charged Current Interactions
• ${}^{159}$Dy electron-capture: a strong new candidate for neutrino mass determination
• The non-resonance shake mechanism of the neutrinoless double electronic capture

Cited by in corpus (2)

• Atomic electron shell excitations in double-$\beta$ decay
• Impact of electron shell excitations on the energy spectrum of $\beta$-electrons in neutrinoless double-$\beta$ decay