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  • 27.40  (2)
  • 27.90+b  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Pre-equilibrium emission in neutron induced reactions on54,56Fe (1988)
    Springer
    The European physical journal 329 (1988), S. 177-187 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01283773
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Inertia and fission paths in a wide range of mass asymmetry (1989)
    Springer
    The European physical journal 333 (1989), S. 291-298 
    Details
    ISSN: 1434-601X
    Keywords: 23.90.+ w ; 25.85.Ca ; 27.90+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Effective inertias for cold fission, heavy ion radioactivities and alpha decay are calculated within the Werner-Wheeler approximation by using two parametrizations of intersecting spheres, with either constant radius (cluster-like shapes) or constant volume (more compact shapes) of the light fragment. A correction for the center of mass motion of a system with axial symmetry is introduced. General analytical relationships are obtained which are easily particularized for various cases of practical interest. If the mass number of the light particle is lower than 31, the action integral calculated using the Yukawa-plus-exponential potential takes lower values for cluster-like shapes than for more compact ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294517
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Nuclear level densities below 40 MeV excitation energy in the mass regionA ≃ 50 (1990)
    Springer
    The European physical journal 335 (1990), S. 299-313 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01304709
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    Paper (German National Licenses)
    Fulltext
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