Double-beta decay physics

In this section we take a look at the primary spectrum produced by the bxdecay0 package. The main documentation for this extension is available here. It aims to reproduce reasonable primary particles to be used as generator for double beta decay physics.

Primary electron properties

The main thing we can compare here are the properties of the primary electrons produced. The bxdecay0 package actually does not even produce the neutrinos emitted in e.g. \(2\nu\beta\beta\).

The combined energy of the two primary electrons.

The opening angle between the two primary electrons.

Different decay modes for the Ge76 decay.

Here \(2\nu\beta\beta\) is the two neutrino double beta decay as predicted by the Standard Model. \(0\nu\beta\beta\) is the neutrinoless double beta decay channel (assuming light majorana neutrino exchange) used for e.g. sensitivity estimates by experiments like LEGEND. More exotic physics like the Majoron-emitting neutrinoless double beta decay with SI=1 \(0\nu\beta\beta\_M1\) shows a distinctive continuous electron spectrum. Other exotic physics like the \(0\nu\beta\beta\_\lambda0\) is a decay mode driven by right-handed currents according to the lambda mechanism and shows a distinctive angular correlation.