Multiple high precision β-decay measurements are being carried out these days on various nuclei, in search of beyond the Standard Model (SM) signatures. These measurements necessitate accurate SM theoretical predictions to be compared with. Motivated by the experimental surge, we present a formalism for such a calculation of β-decay observables, with controlled accuracy, based on a perturbative analysis of the theoretical observables related to the phenomena, including high order nuclear recoil and shape corrections. The accuracy of the corrections is analyzed by identifying a hierarchy of small parameters, related to the low-momentum transfer characterizing β-decays. Furthermore, we show that the sub-percent uncertainties, targeted by ongoing and planned experiments, entail an accuracy of the order of 10% for the solution of the nuclear many-body problem, which is well within the reach of modern nuclear theory for light to medium mass nuclei.
|Journal of Physics G: Nuclear and Particle Physics
|Published - Oct 2022
Bibliographical notePublisher Copyright:
© 2022 The Author(s). Published by IOP Publishing Ltd.
- beta decay
- beyond the standard model signatures in nuclear physics reactions
- theoretical uncertainty assessment