Performance results of National Array of Neutron Detectors (NAND) facility at IUAC

Abstract The 100 element neutron detector array facility, National Array of Neutron Detectors (NAND) has been installed at Inter University Accelerator Centre (IUAC), New Delhi for experiments in heavy-ion reaction studies. The detector array consists of 100 organic liquid scintillators, each of size 5” × 5” coupled to 5 in. diameter photomultiplier. The liquid cells are mounted at 175 cm from the target with full array covering 3.3% of 4 π solid angle. We present an overview of the design and implementation of various subsystems of the array. Description of the mechanical structure, development of detectors and nuclear electronics for signal processing, data acquisition, characterization of detectors and test results are presented. Results on the performance characteristics of the array are given based on the offline tests using radioactive sources and commissioning test by in-beam experiments. The system demonstrates good n − γ discrimination and time-of-flight performance.