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[[Image:mona_above.jpg|thumb|200px|right|The MoNA 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. It is located at [http://www.msu.edu Michigan State University's] [http://www.nscl.msu.edu National Superconducting Cyclotron Laboratory] and has a [http://www.cord.edu/dept/physics/mona/overview_collaboration.html homepage]. In its original configuration, MoNA consisted of 9 vertical layers of 16 detectors each stacked in compact form, having an active area of 2.0 m wide by 1.6 m tall. In its current arrangement (depicted in the image to the right), it is stacked in four separate sections of 2, 2, 2, and 3 layers each, respectively, separated by spaces ranging from 0.5 to 0.8 meters. 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 <ref>B. Luther et al., Nucl. Instr. And Methods A505, 33 (2003)</ref><ref>T. Baumann et al., Nucl. Instr. And Methods A543, 517 (2005)</ref>.<br /><br />
The detection efficiency of MoNA is maximized for the high-beam velocities that are available at the [http://www.nscl.msu.edu NSCL's] 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 <ref>V. Zelevinsky and A. Volya, AIP Conf. Proc. 819, 493 (2006)</ref><ref>S. Prestemon et al., IEEE Trans. Appl. Supercond. 11, 1721 (2001)</ref><ref>J. Toth et al., IEEE Trans. Appl. Supercond. 12, 341 (2002)</ref><ref>M. B. Bird et al., IEEE Trans. Appl. Supercond. 14, 564 (2004)</ref><ref>M. B. Bird et al., IEEE Trans. Appl. Supercond. 15, 1252 (2005)</ref> and its focal plane detectors for charged particles <ref>N. Frank, Ph.D. Thesis, MSU, unpublished (2006)</ref>. 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 <ref>D. Bazin et al., Nucl. Instr. and Meth. B 204, 629 (2003)</ref>. Due to its high-energy detection efficiency, this detector will be well suited for experiments with fast fragmentation beams at the proposed ISF.
== History ==
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