Abstract
The slow neutron absorption cross sections of gold and cobalt have been accurately redetermined by transmission measurements in the neutron wavelength range 4 to 47 Å. For the range 4 to 7.6 Å a new time-of-flight spectrometer at the FRM reactor was used which involves a system of three synchronized choppers and a 150 m long guide tube as flight path. Utilizing the high wavelength resolution of the spectrometer, the time-of-flight wavelength scale could be accurately calibrated (±2 · 10−3 Å) by means of various Bragg cutoff breaks observed in transmission on polycrystalline samples. Supplementary transmission measurements on gold and cobalt were performed in the range 11–47 Å using the time-of-flight spectrometer for ultracold neutrons at the FRM reactor.
The absorption cross sections were evaluated considering corrections for incoherent and inelastic scattering and for the slight deviation from 1/v of the absorption of gold due to the 4.9 eV resonance level. For the absorption at subthermal energies we obtainσ a /gl=(54.35±0.06) b/Å for Au, (20.66±0.04) b/Å for Co. Evaluation of the absorption cross sections at 2200 m/s neutron velocity gives (98.68±0.12) b for Au, (37.15±0.08) b for Co.
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The authors wish to acknowledge gratefully the current support and interest by Professor H. Vonach, who stimulated this work. Thanks are also due to Dr. A. Steyerl for valuable discussions and advice in the measurements at his ultra-cold-neutron spectrometer. Mr. W. Waschkowski was so kind to perform the cobalt measurement at 1.25 eV. Mr. K. Färber kindly assisted in the operation of the three-chopper system.
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Dilg, W., Mannhart, W., Steichele, E. et al. Precision neutron total cross section measurements on gold and cobalt in the 40 μeV-5 meV range. Z. Physik 264, 427–444 (1973). https://doi.org/10.1007/BF01391712
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DOI: https://doi.org/10.1007/BF01391712