Fast neutron inelastic scattering cross sections in /sup 232/Th

Thesis/Dissertation · Fri Dec 31 23:00:00 EST 1982

OSTI ID:6495146

Ciarcia, C A

Fast neutron inelastic scattering cross sections for levels between 700-1550-keV excitation energy in the actinide nucleus, /sup 232/Th, have been measured using the (n,n') time-of-flight technique. Two series of measurements were undertaken using neutrons with a typical energy spread of 8-10 keV, generated by the /sup 7/Li(p,n)/sup 7/Be reaction. These measurements for 125/sup 0/ -differential scattering cross sections were performed over the incident neutron energy regions of 1) 0.950-1.550 MeV, in 50-keV intervals with the time-of-flight spectrometer optimized to detect 0.200-0.400-MeV scattered neutrons and 2) 1.200-2.000 MeV, in 100-keV intervals with the time-of-flight spectrometer optimized to detect 0.400-0.800-MeV scattered neutrons. Techniques for unfolding the complicated spectra obtained from these (n,n') studies were developed, employing user interactive computer codes. Excitation function and angular distribution results were compared with 1) theoretical calculations that included both compound-nucleus and direct-interaction mechanisms, 2) the Evaluated Nuclear Data File (ENDF-B/V) and 3) previous (n,n') and (n,n'..gamma..) cross section measurements. Where applicable, estimates of electric monopole (EO) transition strengths were determined from these comparisons.

• Research Organization: Lowell Univ., MA (USA)
• OSTI ID: 6495146
• Country of Publication: United States
• Language: English

Related Subjects

652025* -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BARYON REACTIONS
COMPUTER CODES
CROSS SECTIONS
DATA
DATA PROCESSING
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
E0-TRANSITIONS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION FUNCTIONS
EXPERIMENTAL DATA
FUNCTIONS
GAMMA SPECTRA
HADRON REACTIONS
INELASTIC SCATTERING
INFORMATION
MEV RANGE
MEV RANGE 01-10
MULTIPOLE TRANSITIONS
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
PROCESSING
SCATTERING
SPECTRA
SPECTRA UNFOLDING
TARGETS
THORIUM 232 TARGET
TIME-OF-FLIGHT METHOD