Working Towards an Absolute Reactor Antineutrino Flux Measurement using PROSPECT-I Data*

The Precision Oscillation and Spectrum Experiment (PROSPECT) is a short-baseline reactor antineutrino experiment designed to perform a sterile neutrino oscillation search and make a precise measurement of the neutrino energy spectrum from a compact reactor core, located at the highly enriched High Flux Isotope Reactor at Oak Ridge National Laboratory. In its first phase, PROSPECT demonstrated a superior signal-to-background while operating with minimal overburden, motivating an absolute flux measurement at the few percent level that has potential impacts on understanding the reactor antineutrino anomaly and the global flux picture, as well as reactor monitoring with neutrino detectors. This talk will outline the major components of an absolute flux measurement with PROSPECT and present a first look at the analysis. Potential improvements on an absolute flux measurement with a second run of the PROSPECT experiment based on this initial analysis will also be presented.