Neutron Detector Array

The HRIBF neutron detector array is one of the ancillary detector arrays for the CLARION system, providing a crucial tool for reaction-channel selection, especially for experiments aimed at proton-rich nuclei. The array consists of 19 liquid scintillating detectors (about 1.4 liters of NE213-equivalent scintillating liquid in each detector). The detectors are tapered hexagons mounted in a closely pack configuration, covering the angles of 0 - 40° at the forward angle of the RMS target position. The neutron-detector array is designed to work with CLARION and Hyball. However, the array presently cannot work in conjunction with the RMS. A photograph of the neutron detector array mounted at the forward angle of the target position at the RMS beam line is shown below.

The efficiency of the neuron detector array depends on individual reaction. The estimated detection efficiency for a fusion-evaporation reaction with a 28Si beam on a 58Ti is about 11%, and the efficiency for a 58Ni-beam-on-28Si reaction is about 18%.

The neutron-gamma separation of the array is achieved by pulse shape discrimination (PSD). A special custom-designed PSD CAMAC electronic module was developed in collaboration with RIS Corp., in Knoxville TN, for this purpose. All the conventional electronics needed in a PSD circuitry are combined and condensed into one of the 4 channels in each PSD CAMAC module. A total of five PSD modules are used for the entire array. Good n-gamma separation is achieved for energies as low as 100-keV recoil electron energies.

For questions about this page please contact the HRIBF User Liaison. class="contactInfo"> This file last modified Monday January 08, 2007