The beam from an EHD ion source using liquid gallium has been shown to have a brigtness of 0.9×105 A cm−2 sr−1 at 21 kV and an energy spread of 12 eV at 10-μA total current. The effective source diameter was 0.2 μm as imaged by a 2-cm-long Einzel lens with a 0.12-mm aperture. Cesium was significantly poorer and mercury much poorer than gallium.
The electron-neutron interaction has been obtained from measurements of thermal neutron scattering by argon, krypton, and xenon. In terms of the slope of the electric structure factor of the neutron at zero momentum transfer, the values obtained were 0.0196±0.0013 F 2 from Ar, 0.0197±0.0007 F 2 from Kr, and 0.0190=1=0.0005 F 2 from Xe. The final result is 0.0193 ±0.0004 F 2 , which corresponds to an electron-neutron scattering length of -1.34db0.03XlO~1 6 cm and an effective potential of -3720=b90 eV. During the course of the experiment, the neutron-absorption cross sections of krypton and xenon (at 2200 m/sec) were measured by transmission and found to be 25.0=1=0.8 b and 25.1=1=1.0 b, respectively. Also, some free-atom thermal-neutron scattering cross sections were measured. The results were 2.415=1=0.010 b for neon, 0.647 ±0.003 b for argon, 7.61=1=0.04 b for krypton, 4.30=1=0.02 b for xenon, 73.7=1=0.4 b for 36 Ar, 1.705=1=0.009 b for 22 Ne, and 5.1=1=0.3 b for 21 Ne. 1425Ne. (1966.
The use of an ultracold neutron interferometer incorporating an electrostatic accelerator having a strong electric field gradient to accelerate neutrons by their possible electric moments is proposed as a method of measuring the neutron electric dipole moment. Such electrical acceleration, followed by an amplifier and a generator of phase difference, could develop relatively large phase differences and these could be measured by a Mach-Zehnder interferometer. This method might extend the sensitivity of the measurement by several orders of magnitude beyond the current limit of 10 −25 e.cm. Furthermore the systematic errors in such a measurement could be significantly different from those of the current EDM experiments.
The absorption cross section of deuterium for 2200-m/sec neutrons has been related to that of boron by intercomparison with lithium. A value of 0.57±0.01 millibarn for deuterium, based on a measured value of 755 barns for boron, has been obtained.
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