Modular Neutron Array
The Modular Neutron Array (MoNA) is a large-area, high efficiency neutron detector designed for detecting neutrons stemming from breakup reactions of fast fragmentation beams. In its standard configuration, MoNA has an active area of 2.0 m wide by 1.6 m tall. It measures both the position and time of neutron events with multiple-hit capability. The energy of a neutron is based on a time-of-flight measurement. This information together with the detected position of the neutron is used to construct the momentum vector of the neutrons [1], [2].
The detection efficiency of MoNA is maximized for the high-beam velocities that are available at Michigan State University's National Superconducting Cyclotron Laboratory Coupled Cyclotron Facility. For neutrons ranging from 50 to 250 MeV in energy, it is designed to have an efficiency of up to 70% and expands the possible coincidence experiments with neutrons to measurements which were previously not feasible. The detector is used in combination with the Sweeper magnet [3], [4], [5], [6], Cite error: A <ref> tag is missing the closing </ref> (see the help page).. In addition, MoNA’s modular design allows it to be transported between experimental vaults and thus to be used in combination with the Sweeper magnet installed at the S800 magnet spectrograph [7]. Due to its high-energy detection efficiency, this detector will be well suited for experiments with fast fragmentation beams at the proposed ISF.
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