Position calibration for a low-energy neutron detector.

A low-energy neutron detector array is being developed for use in (p,n) charge-exchange experiments with radioactive beams. The array will consist of 25 plastic-scintillator bars that are capable of detecting neutrons with energies as low as approximately 200 keV. Since the kinematical reconstructing of a (p,n) reaction is performed using the energy and angle information from the neutron, good energy (measured by time-of-flight) and angle resolutions are important. In the initial testing stage, a single scintillator bar is tested using 22 Na and 252 Cf sources. In the presentation, results from these measurements will be discussed, focusing on the angle resolution of the array.