Speaker
Description
The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is a 26-ton gadolinium-loaded (Gd-loaded) water Cherenkov detector located on the Booster Neutrino beamline at Fermilab. ANNIE's primary physics objectives include measuring neutron multiplicity for neutrino-nucleus interactions and performing cross-section measurements of charge current quasi-elastic and neutral current quasi-elastic processes. These measurements aim to improve neutrino energy reconstruction and reduce uncertainties in current and future neutrino oscillation experiments. Additionally, ANNIE serves as a testbed for advanced technologies such as Large Area Picosecond Photodetectors (LAPPDs) and Water-Based Liquid Scintillator, which enhance vertex resolution and enable detection below the Cherenkov threshold.
The high neutron capture cross section of Gd-loaded water allows ANNIE to tag and count final-state neutrons in beam-correlated neutrino interactions. In this poster, we will present the current status of the ANNIE neutron multiplicity measurement, from the neutron identification methodology to the source calibration campaigns used to map ANNIE's neutron capture efficiency.