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It was demonstrated that the previously reported 1.8-hr Ce 145 and 4.5-hr Pr 145 do not occur among the uranium fission products. Ce 146 and Pr 146 were briefly reinvestigated: the former decays with a half-life of 13.9±0.6 minutes and emits β -rays of 0.9-Mev maximum energy followed by soft γ...
The total neutron cross sections of Co, Ga, Se, Cd, Te, Pt, Au, Hg, and Th were measured as a function of neutron energy from 0.1 to 3 Mev. An estimate of the error caused by neutrons scattered into the detector was made by measuring the apparent cross section as a function of sample diameter....
Experiments have been performed to observe gamma-rays produced by the interaction of 14-Mev neutrons with iron. Although the gamma-spectrum appears to be continuous below 3.0 Mev, there may be discrete gamma-rays at 3.3, 4.4, 5.8, 7.1, and 8.75 Mev. The total cross section for gamma-ray...
A relativistic, double-focusing mass spectrometer has been built to operate with 55-kev electrons. It has reversible electric field and fixed magnetic field. Positrons from Na 22 and electrons from a hot filament alternately follow identical trajectories in opposing directions. The magnitude of...
The theory of multiple Coulomb scattering discussed in Part I has been applied to some specific problems in the analysis of data obtained with a multiplate cloud chamber. In particular, the problem of estimating the momentum (or, more exactly, the quantity Π = p c β ) for a single particle is...
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