Neutron scattering studies in thorium and uranium. Progress report, 1 September 1979-30 June 1980. [Dept. of Physics and Applied Physics, Univ. of Lowell, Massachusetts]
Analysis of (n,n'..gamma..) measurements is now essentially complete, and level cross sections inferred from these data have been extracted for twenty-seven levels up to E/sub x/ = 1516 keV in /sup 238/U, and for thirty-seven levels up to E/sub x/ = 1738 keV in /sup 232/Th. One goal of the present work is to compare the level cross sections obtained from (n,n'..gamma..) with those from (n,n') measurements, to determine whether the former values are generally lower due, for example, to E0 contributions. Inelastic neutron scattering from high-lying states near 1 MeV excitation was measured in both /sup 232/Th and /sup 238/U, over the range of incident energies corresponding to the (n,n'..gamma..) studies. So far the results show no significant discrepancies between the (n,n'..gamma..) and (n,n') cross sections for most levels near theshold. Considerable progress was made on the near-threshold measurements of inelastically scattered neutrons from the 45-keV first excited state in /sup 238/U. These measurements were conducted using both the standard disk scatterer geometry and a ring scatterer with forward-angle geometry. These two very different techniques give cross sections in excellent agreement with one another; the measurement at 81 keV is the lowest energy measurement of this type published to date. Improved time resolution was also demonstrated using thin, ring-shaped scatterers at back angles. Data reduction capabilities have been further enhanced by the acquisition of several new peripherals. 17 figures, 1 table. (RWR)
- Research Organization:
- Lowell Univ., MA (USA). Dept. of Physics and Applied Physics
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-79ER10344
- OSTI ID:
- 5148707
- Report Number(s):
- DOE/ER/10344-2; TRN: 80-015061
- Country of Publication:
- United States
- Language:
- English
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