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Phase space factors for $\beta^+\beta^+$ decay and competing modes of double-$\beta$ decay
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abstract
A complete and improved calculation of phase space factors (PSF) for $2\nu\beta^+\beta^+$ and $0\nu\beta^+\beta^+$ decay, as well as for the competing modes $2\nu EC\beta^+$, $0\nu EC\beta^+$, and $2\nu ECEC$, is presented. The calculation makes use of exact Dirac wave functions with finite nuclear size and electron screening and includes life-times, single and summed positron spectra, and angular positron correlations.
Forward citations
Cited by 2 Pith papers
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Positron-Emitting and Electron-Capturing Double-Beta Processes in the Standard Model and Beyond
Nuclear matrix elements and phase-space factors are computed for 2ν and 0ν positron-emitting double-beta modes in three isotopes, yielding sensitivity to SMEFT lepton-number-violating operators at 1-100 TeV and showin...
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Measurement of two-neutrino double electron capture half-life of $^{124}$Xe with PandaX-4T
PandaX-4T measured the 124Xe two-neutrino double electron capture half-life as (1.03±0.15_stat±0.08_sys)×10^22 years and a K-shell capture fraction of (65±5)% from 1.73 tonne-years of exposure.
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