Direct Calculation of the Two-Neutrino Double-Beta Decay Rate Including the Full Lepton-Energy Dependence
Abstract
The calculation of the two-neutrino double-beta decay (DBD) rates has so far relied on approximations that decouple the nuclear structure from the emitted lepton kinematics. To ensure a more rigorous treatment, we propose an approach which incorporates the full interdependence between nuclear structure and lepton kinematics within a unified formula and performs calculations without resorting to these approximations. Deviations of the decay rates and electron spectra from the traditional methods, such as closure, non-closure, and Taylor expansion approximations, are presented and discussed for the isotopes 82Se and 136Xe. Our approach gives a more realistic description of the DBD process and paves the way for further theoretical and experimental investigations into the correlated nuclear structure interplay with emitted lepton kinematics contributing to the dynamics of the process. Extensions of this framework to other isotopes and to neutrinoless double-beta decay are currently underway.
Versions
Related
- The Scalar MSW Effect: Compact analytical formulas for neutrino oscillations with large matter effects, including μ−μ and τ−τ dominant matter potentials
- Double integral representation in the invariant masses of a composite system and nonperturbative calculation of the asymptotics of light-meson electromagnetic form factors
- Testing coherent elastic neutrino-nucleus scattering N dependence
- Novel dependence between neutrino mass splittings strongly supported by initial JUNO results
- Neutrino Emissivity in Δ-direct-Urca Processes Inside Neutron Stars
BibTeX
@misc{ghinescu2026direct,
title = {{Direct Calculation of the Two-Neutrino Double-Beta Decay Rate Including the Full Lepton-Energy Dependence}},
author = {S. A. Ghinescu and A. Neacsu and S. Stoica},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2606.31107},
eprint = {2606.31107},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.31107},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Direct Calculation of the Two-Neutrino Double-Beta Decay Rate Including the Full Lepton-Energy Dependence
AU - S. A. Ghinescu
AU - A. Neacsu
AU - S. Stoica
PY - 2026
DA - 2026/09/14
PB - arXiv
DO - 10.48550/arxiv.2606.31107
UR - https://arxiv.org/abs/2606.31107
AB - The calculation of the two-neutrino double-beta decay (DBD) rates has so far relied on approximations that decouple the nuclear structure from the emitted lepton kinematics. To ensure a more rigorous treatment, we propose an approach which incorporates the full interdependence between nuclear structure and lepton kinematics within a unified formula and performs calculations without resorting to these approximations. Deviations of the decay rates and electron spectra from the traditional methods, such as closure, non-closure, and Taylor expansion approximations, are presented and discussed for the isotopes ^82Se and ^136Xe. Our approach gives a more realistic description of the DBD process and paves the way for further theoretical and experimental investigations into the correlated nuclear structure interplay with emitted lepton kinematics contributing to the dynamics of the process. Extensions of this framework to other isotopes and to neutrinoless double-beta decay are currently underway.
ER -