Phase I of ANNIE, which involved mapping the neutron background, was completed in 2017.
Notes on verification
Confirmed by official Fermilab ANNIE experiment pages and a DOE/OSTI final report, all independent and consistent regarding Phase I completion in 2017. [tier=silver indep_score=0.539 clusters=2 claim_tier=everyday]
Sources
- Accelerator Neutrino Neutron Interaction Experiment (wikipedia)
- https://annie.fnal.gov/ (corroboration)
- https://annie.fnal.gov/anniephysics/ (corroboration)
- https://www.osti.gov/servlets/purl/1545378 (corroboration)