Anthony, Lee Saunders2015-06-232015-06-231958http://hdl.handle.net/10919/53017A Sigma Pile was constructed to serve as a laboratory facility at V.P.I. Reproducible foil positions are possible with the positioning plates installed on the pile. Withdrawal of the two outer blocks in each foil channel is facilitated by a coupling mechanism. Five source positions permit operation with reduced harmonics. The neutron distribution in the pile was proven to be symmetric by horizontal and vertical traverses. By means of a diffusion length measurement, which gave an "L” of 54.5 ± 2 cm, and a Fermi Age measurement, which gave a "r” of 357 ± 5 cm², the parameters of the pile were shown to be in good agreement with published data on graphite.68 leavesapplication/pdfen-USIn CopyrightLD5655.V855 1958.A674Nuclear reactorsNuclear energy -- Research -- LaboratoriesThesis