Development of a Current-Mode CsI Gamma Detector Array for Precision Weak Interaction Experiments

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In addition to the strong interaction between neutrons and protons which binds them in the nucleus, there is also a "weak" interaction. The precise strength ofthis interaction between neutrons and protons is not known, andcurrent results from different experiment are contradictory.However, the weak interaction is known to possess the uniqueproperty of causing reactions that look different in a mirror.We intend to construct a detector which can sensepart-per-billion mirror asymmetries in reactions involving neutrons and protons that produce gamma rays. This detectorwill first be used in an upcoming experiment at the LANSCE pulsed neutronsource at Los Alamos which will detect the mirror asymmetry in neutron captureon protons. It will be designed and constructed at the Indiana University Cyclotron Facility.