Neutron Measurements with the Brookhaven Crystal Spectrometer

Autor:	L. B. Borst, V. L. Sailor
Rok vydání:	1953
Předmět:	Materials science Spectrometer business.industry Resolution (electron density) chemistry.chemical_element Bragg's law law.invention Crystal Wavelength Optics chemistry law Neutron Atomic physics Beryllium business Instrumentation Monochromator
Zdroj:	Review of Scientific Instruments. 24:141-148
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.1770642
Popis:	A new crystal spectrometer for slow neutron cross section measurements is described in detail. Beryllium has been found to be an exceptionally good neutron monochromator extending the useful range of crystal spectrometers to energies of about 50 ev with good resolution. The characteristics of crystals for use as neutron monochromators are discussed in regard to intensity of the Bragg reflection, resolution, spectral distribution, higher order contamination, and background. Evidence is presented concerning the precision of energy measurements with the BNL spectrometer. The energies of the lowest resonances in the following elements were found to be: iridium E0=0.654±0.003, rhodium E0=1.260±0.004, indium E0=1.458 ±0.005, rhenium E0=2.16±0.01, gold E0=4.93±0.03, and silver E0=5.235±0.035 ev. Comparison with similar measurements made with time‐of‐flight spectrometers shows that the de Broglie equation for computing neutron wavelengths is valid to within about ½ percent, the precision of present‐day experiment...
Databáze:	OpenAIRE
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