MACRO is designed to make a multiply redundant search for GUT magnetic monopoles over a wide velocity range. The 100 MHz pulse height recorder and synchronous encoder (PHRASE) and the energy reconstruction processor (ERP) are two components of that search, both based on the MACRO liquid scintillator. They are sensitive to monopoles with or without captured nuclei in the range β ∼ 10-3 to β ∼ 1. Here, the performance of these systems is discussed, including also analysis methods and background evaluations.
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We gratefully acknowledget he staff of the Labo-ratori Nazionali de1 Gran Sass0 and the invaluable assistanceo f the technical staffs of all the participating institutions. For generousf inancial contributions we thank the U.S. Department of Energy, the National Science Foundation and the Italian Zstituto Nazionale di Fisica Nucleare, both for direct support and for FAI grants awarded to non-Italian MACRO collaborators.