The PROSPECT-II Detector Upgrade

The Precision Reactor Oscillation and SPECTrum (PROSPECT) experiment is a short-baseline reactor experiment with the goal of measuring the antineutrino spectrum from the High Flux Isotope Reactor (HFIR). It searches for potential short-baseline oscillations and the existence of sterile neutrinos. PROSPECT has already set new limits on the existence of eV-scale sterile neutrinos while achieving the highest signal-to-background ratio on any surface antineutrino detector. Despite the achievements so far, progress remains to be made. The collaboration has developed an upgraded detector design, called PROSPECT-II, which will greatly increase collected antineutrino statistics and physics sensitivity. Building off successful elements of the first PROSPECT-I detector, this upgrade will improve robustness and reliability to ensure long-term stable operation and allow the possibility of relocation to different reactor types. This presentation will describe the design of the PROSPECT-II detector and its expected performance.