Results 171 to 180 of about 2,298 (210)

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.
W. P. Stinson, L. C. Schmid, R. E. Heineman   +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 ...
E. Ya. Doil'nitsyn, A. G. Novikov, I. P. Stakhanov, A. S. Stepanov   +3 more
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Low-Temperature Neutron Moderation

Physical Review Letters, 1960
Measurements on an energy level in the microwave spectrum of water are discussed. The inelastic cross section for scattering of 0.005 ev neutrons from HO/sub 1/2/ at room temperature was estimated to be 8 barns. (C.J.G.)
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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.
V. K. Ignatovich, A. Meister, S. Mittag, W. Pilz, D. Seeliger, K. Seidel   +5 more
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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.
O. R. FRISCH, H. VON HALBAN, JØRGEN KOCH   +2 more
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Neutron scattering at nK temperatures

Neutron News, 1991
Abstract The study of nuclear magnetic order in Copper is the most ambitious and difficult neutron scattering experiment ever performed at Ris⊘. Beside expensive hardware, approximately 50man-months of scientific work, 24 months of beam time and 10000 litres of liquid He had to be invested before we could even expect to discover whether the experiment ...
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Temperature sensing by neutron transmission

Nuclear Instruments and Methods, 1972
Abstract The potential of using neutron transmission as a temperature sensor is demonstrated.
A.A. Harms, W.J. Garland
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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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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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Internal Neutronics-Temperature Coupling in Serpent 2

Nuclear Science and Engineering, 2014
This paper describes the built-in calculation routines in the reactor physics code Serpent 2 that provide a novel method for solving the coupled problem of the power distribution, temperature distribution, and material property distributions in nuclear fuel elements.
Leppänen Jaakko, Valtavirta Ville, Viitanen Tuomas   +2 more
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