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arxiv: 1303.4124 · v1 · pith:6OBNX6V6new · submitted 2013-03-18 · ⚛️ nucl-th

Phase space factors for β^+β^+ decay and competing modes of double-β decay

classification ⚛️ nucl-th
keywords betadecaycalculationcompetingfactorsmodesphasepositron
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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.

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  1. Positron-Emitting and Electron-Capturing Double-Beta Processes in the Standard Model and Beyond

    hep-ph 2026-06 unverdicted novelty 5.0

    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...