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Evaluation of (n,n') scatteriung cross sections from 0. 8 to 2. 5 MeV for higher collective bands of /sup 232/Th and /sup 238/U in ''standard'' (CN + DI) and ''unified'' (Weidenmerller s-matrix) formalisms

Book ·
OSTI ID:6348778
;
Angle-integrated cross sections for inelastic scattering of fast neutrons from 0.8 to 2.5 MeV on /sup 232/Th and /sup 238/U, proceeding to higher collective (quadrupole and octupole vibrational) states in the residual nuclei, have been computed in a standard and a unified approach; the resulting excitation functions have been compared with the experimental data of the Lowell group. In all calculations, a consistent set of optical potential and deformation parameters, as derived by Haouat and Lagrange of the Bruyeres group, was used. The standard formalism employed an incoherent sum of compound-nucleus (CN) and coupled-channels direct-interaction (DI) cross section, evaluated with the programs CINDY and KARJUP (Karlsruhe version of JUPITOR) respectively. Provision was made for the effect of level-width fluctuations and for competing neutron exit channels. The results in general compared well with the measured values, but in several instances disagreed significantly with the ENDF/B-V evaluated data. Still better agreement ensued from the use of the unified formalism based upon energy-averaged second moments of transformed S-matrix elements in a statistical approach developed by Weidenmueller at al. and embodied within a new fluctuation program NANCY with coupled channels and competing channels to generate and manipulate the grand ensemble of S-matrix elements. With only the coupling strengths as adjustable parameters, this offers a promising, reliable means of analysis well suited to the interpretation of neutron scattering on deformed actinide nuclei.
OSTI ID:
6348778
Country of Publication:
United States
Language:
English

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Related Subjects

653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BARYONS
BEAMS
CROSS SECTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FAST NEUTRONS
FERMIONS
HADRON REACTIONS
HADRONS
INELASTIC SCATTERING
KEV RANGE
KEV RANGE 100-1000
MATRICES
MEV RANGE
MEV RANGE 01-10
NEUTRON BEAMS
NEUTRON REACTIONS
NEUTRONS
NUCLEAR QUADRUPOLE RESONANCE
NUCLEAR REACTIONS
NUCLEON BEAMS
NUCLEON REACTIONS
NUCLEONS
PARTICLE BEAMS
RESONANCE
S MATRIX
SCATTERING
TARGETS
THORIUM 232 TARGET
URANIUM 238 TARGET