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- W289317009 abstract "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. Withmore » 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.« less" @default.
- W289317009 created "2016-06-24" @default.
- W289317009 creator A5055841557 @default.
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- W289317009 date "1982-01-01" @default.
- W289317009 modified "2023-09-26" @default.
- W289317009 title "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" @default.
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