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Final Report: A Calorimeter for Neutron Flux Measurement

A calorimeter for absolute neutron flux measurement has been built and tested. The calorimeter measures the heat produced in a 10°K thick LiPb target when neutrons are captured via the eLi(n,3 H)4He reaction. The sensitivity achieved was 1.3x106 n/s for a 1 hour measurement. Separate flux measurements with the calorimeter and a 238U fission chamber are in agreement and show that systematic errors are less than 3%. An improved calorimeter has been built which is sensitive to l0 s n/s for a 1 hour measurement.