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  • 27.40  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 329 (1988), S. 177-187 
    ISSN: 1434-601X
    Keywords: 25.40.Fq ; 27.40 ; 21.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The experimentally well known (n, p), (n, α) and (n, 2n) reaction excitation functions, from threshold to 20 MeV incident energy, and neutron and proton emission spectra at 14.8 MeV from54,56Fe targets are calculated in the frame of the Geometry-Dependent Hybrid pre-equilibrium emission model, including angular momentum and parity conservation, and the Hauser-Feshbach statistical model. Use of a consistent statistical model parameter set enables the validation of the pre-equilibrium emission model. Moreover, an enhanced pre-equilibrium emission from higher spin composite system states, associated with higher incoming orbital momenta, has been evidenced. Higher orbital momenta involved also in the emergent channels of the process are suggested by calculations of the residual nuclei level populations.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 335 (1990), S. 299-313 
    ISSN: 1434-601X
    Keywords: 25.40. Fq ; 27.40 ; 21.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Consistent pre-equilibrium emission and statistical model calculations of fast neutron induced reaction cross sections are used to validate nuclear level densities for excitation energies up to 40 MeV in the mass regionA ≃50. A “composed” level density approach has been employed by using the back-shifted Fermi gas model for excitation energies lower than 12 MeV and a realistic analytical formula for higher excitations. In the transition region from the BSFG model range to that of full applicability of the realistic formula, an interpolation between the predictions of the two models is adopted. The interpolation rule, suggested by microscopic level density calculations, has been validated through the comparison of the calculated and experimental cross sections.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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