Mutual Shielding of Lattice Pins in the Resonance Energy Region

Measurements have been made to determine the effect of mutual shielding on the resonance absorption of neutrons by tightly packed thorium oxide lattice pins. From these measurements, correction factors have been obtained for reducing the results of single-pin resonance integral measurements to the effective lattice values. A comparison of the experimental results with the predictions of the theory of Dancoff and Ginsburg is included.