A pp̄ luminosity monitor for Fermilab experiment E760

The design and performance of the luminosity monitor for Fermilab experiment E760, in which the circulating antiproton beam in the FNAL antiproton accumulator intersects a hydrogen gas-jet target, is described. Absolute luminosity monitoring at the level of ±0.8% (statistical) ±2.1% (systematic) is achieved. The luminosity monitor also enables forward scattering parameters to be measured for momenta in the 3–8 GeV range with greater precision than achieved before.