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Novel Neutron Detector for n-n Scattering Length Measurement

NOVEL DETECTOR FOR n-n SCATTERING LENGTH MEASUREMENT Eva Wilcox Department of Physics and Astronomy Master of Science The neutron-neutron (n-n) scattering length is a fundamental parameter in nuclear physics, but experiments give one of two different numbers and there is still no adequate explanation for this discrepancy. However, measurements are plagued with large uncertainties caused by neutron detector cross talk. Many experimentalists also rely upon computer code to calibrate their neutron detectors. We have developed a new neutron detector expressly for the purpose of improving the n-n scattering length measurement. It offers two important advantages: 1) minimal cross talk and 2) high counting efficiency. We calibrated the detector from 1 MeV to 6 MeV at 1 MeV increments. We have shown that the computer code, MCNP, does not always give the correct detector efficiency, and that reliance upon this code for calibration could be a large factor for error in previous experiments. Preliminary tests show no cross talk between two like detectors and suggest that these detectors are appropriate for a n-n scattering length measurement.