Neutron inelastic scattering cross sections for states above 700 keV in /sup 232/Th

Journal Article · Sun Dec 01 04:00:00 EST 1985 · Nucl. Sci. Eng.; (United States)

OSTI ID:5708131

Ciarcia, C A; Couchell, G P; Egan, J J; Kegel, G H.R.; Li, S Q; Mittler, A; Pullen, D J; Schier, W A; Shao, J Q

Fast neutron inelastic scattering cross sections for levels between 700- and 1400-keV excitation energy in /sup 232/Th have been measured using the (n,n') time-of-flight (TOF) technique. Measurements of 125-deg differential cross sections were made using neutrons with a typical energy spread of 8 to 10 keV, generated by the /sup 7/Li(p,n)/sup 7/ Be reaction. The incident neutron energies covere three regions: (a) 950 to 1550 keV in 50-keV intervals with the TOF spectrometer optimized to detect 200 to 600-keV scattered neutrons, (b) 1200 to 2000 keV in 100-keV intervals with the spectrometer optimized to detect 400- to 800-keV scattered neutrons, and (c) 1700 to 2100 keV in 100-keV steps with the spectrometer optimized for 800- to 1300-keV scattered neutrons. Throughout the experiment, an overall energy resolution of <15 keV was maintained. Level cross sections were deduced from the 125-deg differential scattering cross sections and are compared with (n,n'..gamma..) measurements and the ENDF/B-V evaluation. Angular distributions for states in the 700- to 900-keV region have been measured at 1.2, 1.5, and 2.0 MeV.

• Research Organization: University of Lowell, Department of Physics and Applied Physics, Lowell, MA
• OSTI ID: 5708131
• Journal Information: Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 91:4; ISSN NSENA
• Country of Publication: United States
• Language: English

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