Online Analysis Tools for the Nab Experiment

The Nab experiment is measuring the electron-neutrino correlation term, along with the Fierz interference term, within the theory of neutron beta decay. The electron-neutrino correlation parameter will be measured with a relative uncertainty of $10^{-3}$, and the Fierz interference term with an uncertainty of $\sim3\times10^{-3}$.  Data collection will begin in the Spring of 2019 at the fundamental physics beamline of ORNL's Spallation Neutron Source. Two segmented, large area, Si detectors will be used with a total of 254 pixels instrumented. Amongst the selection of analysis tools being developed, two will be presented. A method for identifying potential pile-up and accidental signals will be discussed, this being vital for energy reconstruction. In this method, a trapezoidal filter has been optimized for the task and a post-filter identification algorithm developed. Additionally, an online extraction of the electron-neutrino correlation parameter is desirable, but difficult given the computational intensity of a full analysis. A proposed analysis, using a Geant4 simulation to characterize the spectrometer's response with respect to available observables, will be presented.