Abstract
We describe a detection system designed for precise measurements of angular correlations in neutron 尾 decay. The system is based on thick, large area, highly segmented silicon detectors developed in collaboration with Micron Semiconductor, Ltd. The prototype system meets specifications for 尾 electron detection with energy thresholds below 10 keV, energy resolution of 鈭�3 keV FWHM, and rise time of 鈭�50 ns with 19 of the 127 detector pixels instrumented. Using ultracold neutrons at the Los Alamos Neutron Science Center, we have demonstrated the coincident detection of 尾 particles and recoil protons from neutron 尾 decay. The fully instrumented detection system will be implemented in the UCNB and Nab experiments to determine the neutron 尾 decay parameters B, a, and b.
