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The scattering of slow neutrons from various materials has been measured with several different detectors. The scattering cross section for a number of elements has been determined and the results given in a table. With suitable filters, the scattering curves for-several of the Fermi groups have...
It has been possible, by a judicious choice of field strength to separate the magnetic components due to the 199 isotope of mercury. Five lines have been studied, λ λ 3 1 2 5 ( P 1 3 D 2 3 ) , 5461, 4358, 4 0 4 7 ( P 3 S 3 ) . A practically complete Paschen-Back effect is observed, each...
With a 600 kv x-ray source and a two-crystal spectrometer especially designed for short wave-length x-rays, the mass absorption coefficients for C(6), Na(11), Al(13), S(16), K(19), Ni(28), Cu(29) were determined for wavelengths from 50 to 209 X.U. A small δ λ interval was used. The results are...
Measurements were made in the temperature range from -185°C to +100°C on bismuth crystals containing Pb, Sn, Sb and Te. The effects were found to be complicated but the following generalizations may be made. Decreasing temperature results in greater effectiveness of the impurity present except...
Measurements are described of the activities imparted to silver and to indium detectors placed in paraffin spheres of various sizes with a radon-beryllium source of neutrons located at the center. The results are discussed with the aid of diffusion theory. Reasonably good quantitative agreement...
In previous comparisons of the theoretical and experimental temperature effect for the reflection of x-rays, a marked discrepancy was found at high temperatures. It is here shown that this discrepancy disappears when proper account is taken of the variation of the characteristic temperature with...
The electromagnetic theory of the torque exerted by a beam of polarized light on a doubly refracting plate which alters its state of polarization is summarized. The same quantitative result is obtained by assigning an angular momentum of ℏ ( - ℏ ) to each quantum of left (right) circularly...
The noise level of a system composed of an ionization chamber and a linear amplifier is calculated as a function of the input circuit parameters and the characteristics of the amplifier. The frequency spectrum of a pulse caused when an ionizing particle passes through the ionization chamber is...
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