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AbstractAbstract
[en] Differential cross sections for neutrons scattered from natural lead and 238U were measured at 0.5, 1.0 and 1.5. At 0.50 a ring geometry was used to increase the solid angle. The ring detector was formed by a suspending shadow bar in front of a disc scintillator. An angular resolution of +-0.10 was achieved for the 0.50 measurements. For the 1.0 and 1.50 measurements, the neutron detector was moved out of the shadow of the shadow bar. Data were averaged over 100 keV intervals from 0.6 to 2.2 MeV. Differential cross sections were corrected for multiple scattering, inelastic scattering, and backgrounds from collimators and shields. Cross sections for polyethylene at 1.50 were also measured for normalization purposes. An optical model calculation which included the electromagnetic interactions of neutrons was used to calculate small angle cross sections. A comparison between measured cross sections and optical model results showed that the inclusion of an induced neutron electric dipole moment interaction was not necessary for a general agreement. Lead and uranium cross sections were also least squares fitted with a function A + Bcot2(theta/sub i//2) at each neutron energy. The weighted mean value of B for 17 energies was 15 percent lower than the value predicted by Schwinger for Pb and was 1.5 percent lower than his prediction for U. The weighted standard deviation of B in both cases was about 4 percent. A linear fit to the coefficient A over 17 energies was used with the measured total cross sections to obtain an upper limit of the magnitude of the real part of the scattering amplitude at 00
Original Title
Differential cross sections, 0.6 to 2.2 MeV, scattering amplitude upper limit
Primary Subject
Source
1975; 117 p; University Microfilms Order No. 76-15,063.; Thesis (Ph. D.).
Record Type
Report
Literature Type
Thesis/Dissertation
Country of publication
ACTINIDE NUCLEI, ALPHA DECAY RADIOISOTOPES, AMPLITUDES, BARYON REACTIONS, CROSS SECTIONS, ELEMENTS, ENERGY RANGE, EVEN-EVEN NUCLEI, HADRON REACTIONS, HEAVY NUCLEI, ISOTOPES, KEV RANGE, METALS, MEV RANGE, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, RADIOISOTOPES, URANIUM ISOTOPES, YEARS LIVING RADIOISOTOPES
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