MRI: High efficency neutron detector layer

密歇根州立大学和佛罗里达州立大学组成的联盟提议建造一种高效、大面积的中子探测器，用于探测高能中子，用于国家超导回旋实验室(NSCL)的快速稀有同位素实验。该联盟的成员包括鲍尔州立大学、中央密歇根大学、明尼苏达州穆尔黑德的康科迪亚学院、南本德的印第安纳大学霍普学院、米利金大学、密歇根西部大学和威斯蒙特学院，每个学院都将组装和测试一整层探测器。该探测器由144个水平塑料闪烁体组成，每层16个探测器，覆盖2.0米宽1.6米高的区域。该探测器是位置敏感的，具有多次命中能力。无源铁转换器的加入提高了对能量在100 MeV以上的中子的探测效率，平均效率高达70%。高探测效率将使人们能够研究只有在小强度下才能产生的非常丰富的中子核。探测器将与新的扫频磁铁及其焦平面探测器在独立模式下以及与扫频磁铁和S800磁谱仪的组合使用。因此，这对于在耦合回旋加速器装置上的实验计划将是必不可少的。由于其模块化设计，探测器可以针对更高的束流能量进行优化，只需进行少量修改。它可能是第一个在稀有同位素上用于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.