Results 251 to 260 of about 250,180 (275)

Neutron Diffusion in a Temperature Gradient

Nuclear Science and Engineering, 1962
>The space energy distribution of neutrons diffusing in a source-free, nonabsorbing medium possessing a temperature gradient is obtained by solving the appropriate Boltzmann equation to a second order approximation using the expansion technique of Chipman and Enskog.
J. R. L. de Ladonchamps, Lawrence M. Grossman   +1 more
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Temperature of neutron stars

International Journal of Modern Physics D, 2016
We start with a brief introduction to the historical background in the early pioneering days when the first neutron star thermal evolution calculations predicted the presence of neutron stars hot enough to be observable. We then report on the first detection of neutron star temperatures by ROSAT X-ray satellite, which vindicated the earlier prediction
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Temperature Shift of Neutron Resonances

1986
Temperature-induced shift of neutron resonances have been experimentally observed studying low-energy resonances of 103Rh, 109Ag, l61Dy and l63Dy with a time-of-flight spectrometer at the Dubna pulsed reactor The shifts are regarded as an analogue to the second-order Doppler effect in Mossbauer gamma-ray spectroscopy.
W. Pilz, S. Mittag, A. Meister, D. Seeliger, Klaus Seidel, Vladimir K. Ignatovich   +5 more
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High-temperature neutron dosimeters

Nuclear Instruments and Methods, 1972
Abstract Preparation methods have been established for certified and pure refractory neutron flux detectors. The classical powder mixing, pressing, sintering, and mechanical finishing operations have been refined for Al 2 O 3 containing 1% CoO and MgO containing 1% CoO.
Jean Joyeux, J. Van Audenhove
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Temperature Equilibrium of C-Neutrons

Nature, 1937
THE slow neutrons leaving a block of paraffin wax, containing a source of fast neutrons, mostly possess thermal energies. The existence of such thermal neutrons has been established by the discovery1 that the temperature T of the paraffin has an influence on the activities induced in various elements.
H. Von Halban, O. R. Frisch, Jørgen Koch   +2 more
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Neutron scattering at ultralow temperatures

Journal of Physics and Chemistry of Solids, 1999
Abstract Neutron scattering allows the application of extreme sample conditions during the experiment.
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An Investigation of Effective Neutron Temperatures

Nuclear Science and Engineering, 1960
Information about effective neutron temperatures has been inferred from measurements of the ratio of the thermal-fission activity of a Pu/sup 239/ foil to that of a U/sup 235/ foil. A discussion of the ratios obtained in various assemblies which were placed in the center of a graphite thermal column is presented.
R. E. Heineman, W. P. Stinson, L. C. Schmid   +2 more
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Relaxation of the temperature of a neutron gas

Soviet Atomic Energy, 1963
The spectra of thermal neutrons were measured in water at various distances from a spherical source, in order to determine the temperature of the neutron gas. The spectrum of the source was obtained by means of the cadmium difference; it exhibited a Maxwellian distribution and a temperature exceeding considerably the temperature of the water, which ...
A. S. Stepanov, E. Ya. Doil'nitsyn, A. G. Novikov, I. P. Stakhanov   +3 more
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Neutron Transport with Temperature Feedback

Nuclear Science and Engineering, 1976
We consider a nonlinear neutron transport problem in a finite homogeneous body with temperature feedback.
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Neutron Production and Temperature in ZETA

Nature, 1958
IT is assumed that thermalization and high temperature have been achieved in ZETA1, although theoretical considerations demand a much longer period than that available for the process to take place2. This discrepancy between apparently observed and the theoretically expected thermalization time may be due to unknown processes occurring which speed up ...
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