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  • 1980-1984  (3)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Isotopic effects in the (n, p) reaction cross section on heavy targets and the statistical preequilibrium model (1983)
    Springer
    The European physical journal 313 (1983), S. 227-234 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The systematic decrease in (n,p) cross sections with increasing neutron number for isotopes in reactions induced by 14 MeV neutrons on heavy targets is explained in terms of the preequilibrium model. The relevant physical quantities responsible for this behavior are proton and neutron separation energies, similarly to (n, p) reactions on lighter nuclei, in which proton emission is governed by the compound-nucleus model. The principal transition rateλ + in the preequilibrium exciton-model calculations should be kept constant (for a given number of excitons and constant energy) in order to obtain a good description of data. The calculations are compared with experimental (n,p) cross sections for series of Te, Xe, W, and Os isotopes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01417230
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Preequilibrium emission of nucleons from reactions induced by medium-energy heavy ions (1983)
    Springer
    The European physical journal 314 (1983), S. 347-355 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The preequilibrium emission of nucleons from reactions induced by medium-energy heavy ions is analyzed by using (i) the first term of the Griffin-exciton-model expansion and (ii) the modified Harp-Miller-Berne equilibration model. It is shown that both models account well for the high-energy component of angle-integrated emission spectra. The values of the relevant parametern 0 (initial number of degrees of freedom which share the available energy), obtained from the analysis with the two models, are practically equal for each reaction studied. The best-fit values ofn 0 depend on the incident energy. This behaviour is a novel feature of preequilibrium emission mechanisms in heavy-ion reactions, hitherto unobserved in light-ion reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412931
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A consistent study of precompound and compound-nucleus emission mechanisms in neutron-induced reactions (1980)
    Springer
    The European physical journal 296 (1980), S. 341-357 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The exciton model in its closed form and the Weisskopf-Ewing model have been consistently applied to neutron-induced reactions. The analysis has been performed for 12 nuclei in the rangeA=45–209. The primary particle-emission is considered to be governed by an admixture of precompound and compound-nucleus mechanisms, while all consecutive particles are considered to undergo pure compound-nucleus emission. The calculated primary-neutron spectra and excitation functions for (n, p), (n, 2n) and (n, 3n) reactions atE n=4–24 MeV have been compared with experimental data. The average best-fit values of the exciton-model free parameterK have been found to be ¯K=700 MeV3. Departures form this value appear to cancel out structure effects introduced into transition rates through the structure-sensitive single-particle level density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438529
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    Paper (German National Licenses)
    Fulltext
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