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Froehner, F.H.; Wisshak, K.; Kaeppler, F.
Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.). Projekt Schneller Brueter1979
Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.). Projekt Schneller Brueter1979
AbstractAbstract
[en] In order to clarify a rather confused issue the neutron capture cross section of 56Fe between 16 and 60 keV was remeasured relative to gold under very clean conditions at the Karlsruhe Van de Graaff accelerator. The metallic samples were isotopically pure and very thin (o.15, 0.3 and 0.6 mm). Time-of-flight discrimination between capture photons and scattered neutrons was employed to suppress signals due to capture of resonance-scattered neutrons outside the sample. This novel technique improves the accuracy significantly with which s-wave resonance capture of structural materials can be measured. The controversial radiation width of the 27.7 keV resonance was found to be GAMMA%sub(γ) = 1.00 +- 0.05 eV (value not quite final yet). (2) An attempt was made to understand the disconcerting discrepancies between the resonance parameters for 58Fe+n determined at Karlsruhe and at Oak Ridge. (3) Statistical resonance parameters for the stable chromium, iron and nickel isotopes were recalculated with an improved version of the maximum-likelihood estimation program STARA. Both strength functions and level spacings differ slightly from the previously (1977) reported values, level spacings being systematically higher. (4) A comparison of the total cross section across the 24.4 keV window of 56Fe+n recently measured at BNL showed good consistency with Harvey's 1970 data for natural iron and with the 1977 KEDAK evaluation. (orig.) 891 FKS/orig. 892 CKA
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Source
Sep 1979; 20 p
Record Type
Report
Literature Type
Numerical Data
Report Number
Country of publication
CAPTURE, CHROMIUM ISOTOPES, CROSS SECTIONS, ENERGY SPECTRA, EVALUATED DATA, EXPERIMENTAL DATA, GAMMA RADIATION, GRAPHS, IRON 56 TARGET, IRON 57, IRON 58 TARGET, IRON 59, IRON ISOTOPES, ISOLATED VALUES, KEV RANGE 10-100, LEVEL WIDTHS, NEUTRON BEAMS, NEUTRON REACTIONS, NICKEL ISOTOPES, RESONANCE, STRENGTH FUNCTIONS, TIME-OF-FLIGHT SPECTROMETERS
BARYON REACTIONS, BEAMS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, DATA, DATA FORMS, DAYS LIVING RADIOISOTOPES, ELECTROMAGNETIC RADIATION, ENERGY RANGE, EVEN-ODD NUCLEI, FUNCTIONS, HADRON REACTIONS, INFORMATION, INTERMEDIATE MASS NUCLEI, IONIZING RADIATIONS, ISOTOPES, KEV RANGE, MEASURING INSTRUMENTS, NUCLEAR REACTIONS, NUCLEI, NUCLEON BEAMS, NUCLEON REACTIONS, NUMERICAL DATA, PARTICLE BEAMS, RADIATIONS, RADIOISOTOPES, SPECTRA, SPECTROMETERS, STABLE ISOTOPES, TARGETS
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