A fast-neutron spectrometer of advanced design

Fast neutron spectrometer combines helium filled proportional counters with solid-state detectors to achieve the properties of high efficiency, good resolution, rapid response, and effective gamma ray rejection

A fast neutron spectrometer of advanced design Final report, 1 May 1966 - 30 Jun. 1967

Helium 3 sandwich type fast neutron spectrometer desig

Development of a continous scanning laminograph Final report, 20 Jun. 1966 - 30 Jun. 1968

Continuous scanning X ray laminograph for nondestructive testing of multilayer printed circuit

Fast-neutron spectrometer developments

Li6 sandwich-type neutron spectrometer is equipped with proportional counter for particle identification. System uses current-sensitive preamplifiers to minimize pile-up of gamma-ray and particle pulses

Nondestructive testing techniques for multilayer printed wiring boards Final report, 30 Jun. 1964 - 30 Sep. 1965

Nondestructive testing techniques for laminated printed circuit board

A fast-neutron spectrometer of advanced design Final report, 3 May 1965 - 3 Feb. 1966

Fast neutron spectrometer based on combination of solid state detectors and helium 3 filled proportional counter

Application of the Moessbauer technique to the study of probable lunar and planetary surface material and to the study of returned lunar surface samples Final report

Preliminary results from Mossbauer instrumental analysis of Apollo 12 lunar rock and soil sample

Multilayered printed circuit boards inspected by X-ray laminography

Technique produces high resolution cross-sectional radiographs with close interplane spacing for inspecting multilayer boards to be used in providing circuitry routing and module structural support

Behavior of vortices near twin boundaries in underdoped Ba(Fe1−xCox)2As2Ba(Fe_{1-x}Co_{x})_{2}As_{2}

We use scanning SQUID microscopy to investigate the behavior of vortices in the presence of twin boundaries in the pnictide superconductor Ba(Fe1-xCox)2As2. We show that the vortices avoid pinning on twin boundaries. Individual vortices move in a preferential way when manipulated with the SQUID: they tend to not cross a twin boundary, but rather to move parallel to it. This behavior can be explained by the observation of enhanced superfluid density on twin boundaries in Ba(Fe1-xCox)2As2. The observed repulsion from twin boundaries may be a mechanism for enhanced critical currents observed in twinned samples in pnictides and other superconductors