Neutrinoless double-electron capture
Blaum, K., Eliseev, S., Danevich, F., Tretyak, V., Kovalenko, S., Krivoruchenko, M., Novikov, Y., & Suhonen, J. (2020). Neutrinoless double-electron capture. Reviews of Modern Physics, 92(4), Article 045007. https://doi.org/10.1103/RevModPhys.92.045007
Published inReviews of Modern Physics
© 2020 American Physical Society
Double-beta processes play a key role in the exploration of neutrino and weak interaction properties, and in the searches for effects beyond the standard model. During the last half century many attempts were undertaken to search for double-beta decay with emission of two electrons, especially for its neutrinoless mode 0ν2β−, the latter having still not been observed. Double-electron capture (2EC) was not yet in focus because of its in general lower transition probability. However, the rate of neutrinoless double-electron capture 0ν2EC can experience a resonance enhancement by many orders of magnitude when the initial and final states are energetically degenerate. In the resonant case, the sensitivity of the 0ν2EC process can approach the sensitivity of the 0ν2β− decay in the search for the Majorana mass of neutrinos, right-handed currents, and other new physics. An overview of the main experimental and theoretical results obtained during the last decade in this field is presented. The experimental part outlines search results of 2EC processes and measurements of the decay energies for possible resonant 0ν2EC transitions. An unprecedented precision in the determination of decay energies with Penning traps has allowed one to refine the values of the degeneracy parameter for all previously known near-resonant decays and has reduced the rather large uncertainties in the estimate of the 0ν2EC half-lives. The theoretical part contains an updated analysis of the electron shell effects and an overview of the nuclear-structure models, in which the nuclear matrix elements of the 0ν2EC decays are calculated. One can conclude that the decay probability of 0ν2EC can experience a significant enhancement in several nuclides. ...
PublisherAmerican Physical Society (APS)
Publication in research information system
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Related funder(s)Academy of Finland
Funding program(s)Academy Project, AoF
Additional information about fundingWe appreciate the valuable discussions with M. Block, T. Eronen, Amand Faessler, D. Frekers, V. Shabaev, F. Šimkovic, and I. Tupitsyn on topics related to 2EC physics. This work is supported in part by the Max Planck Society. K. B. and S. E. acknowledge the support of the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 832848- FunI. F. A. D. and V. I. T. were supported in part by National Research Foundation of Ukraine Grant No. 2020.02/0011. S. K. acknowledges the support of ANID Fondecyt (Chile) Grant No. 1190845 and CONICYT (Chile) Project No. PIA/ Basal FB0821. M. I. K. is supported by RFBR Grant No. 18- 02-00733 (Russia) and the Alexander von Humboldt Foundation (Germany). Yu. N. N. is supported by the Extreme Matter Institute EMMI (GSI Darmstadt). J. S. was partly supported by the Academy of Finland under Project No. 318043. F. A. D., M. I. K., Yu. N. N., and V. I. T. acknowledge the kind hospitality of Max-Planck-Institut f ¨ur Kernphysik in Heidelberg, where part of this work was done. ...
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