  Muon beams of low emittance provide the basis for the intense,
well-characterised neutrino beams of a neutrino factory and for multi-TeV
lepton-antilepton collisions at a muon collider. The international Muon
Ionization Cooling Experiment (MICE) has demonstrated the principle of
ionization cooling, the technique by which it is proposed to reduce the
phase-space volume occupied by the muon beam at such facilities. This paper
documents the performance of the detectors used in MICE to measure the
muon-beam parameters, and the physical properties of the liquid hydrogen energy
absorber during running.
