MRI: A Highly Efficient Neutron Detector Array to Study Neutron-Rich Rare Isotopes at the NSCL

密歇根州立大学和佛罗里达州立大学之间的联合体提议建造一个高效、大面积的中子探测器，用于探测国家超导回旋加速器实验室（NSCL）的快稀有同位素实验中使用的高能中子。加入这个联盟的有鲍尔州立大学、中央密歇根大学、明尼苏达州穆尔黑德的康考迪亚学院，Hope College，印第安纳州大学南本德分校，密立金大学，西密歇根大学和韦斯特蒙学院，他们将组装和测试一个完整的探测器层。 探测器对位置敏感，具有多次命中能力。 被动铁转换器的加入提高了对能量超过100 MeV的中子的探测效率，平均效率高达70%。 探测器的高探测效率将使人们能够研究只有在低密度下才能产生的非常富中子的核。该探测器将与新的扫掠磁铁及其焦平面探测器一起使用，并以独立模式与扫掠磁铁和S800磁谱仪结合使用。 因此，这将是必不可少的实验计划在耦合回旋加速器设施。由于其模块化设计，只需进行微小修改，该探测器就可以针对更高的光束能量进行优化。 它可能是第一个用于稀有同位素快速碎裂束的探测器

The consortium between Michigan State University and Florida StateUniversity proposes the construction of a highly efficient,large-area neutron detector for the detection of high-energyneutrons to be used in experiments with fast rare isotopes at theNational Superconducting Cyclotron Laboratory (NSCL). Thisconsortium is joined by Ball State University, Central MichiganUniversity, Concordia College in Moorhead, Minn., Hope College,Indiana University at South Bend, Millikin University, WesternMichigan University, and Westmont College, each of which willassemble and test one complete layer of the detector.The proposed detector consists of 144 horizontal blocks of plasticscintillator arranged in 9 layers of 16 detectors each, covering anarea of 2.0 m wide by 1.6 m high. The detector is positionsensitive and features multi-hit capability. The addition ofpassive iron converters enhances the detection efficiency forneutrons with energies above 100 MeV for an average efficiency of upto 70%. The high detection efficiency will allow the investigationof very neutron-rich nuclei that can only be produced with smallintensities.The detector will be used in connection with the new sweeper magnetwith its focal plane detectors in stand-alone mode as well as withthe combination of sweeper magnet and the S800 magneticspectrograph. It will therefore be essential for the experimentalprogram at the coupled cyclotron facility. The detector can beoptimized for even higher beam energies with only minormodifications due to its modular design. It could be the firstdetector to be used for fast fragmentation beams at the Rare Isotope