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  • 1990-1994  (2)
  • 1975-1979  (4)
  • 1970-1974  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    On the theory of stripping reactions into the continuum (1974)
    Springer
    The European physical journal 267 (1974), S. 103-109 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A formulation of stripping reactions into the continuum is given taking the(d, p)-reaction as a specific example. We use the DWBA and the assumption that contributions from the nuclear interior are negligible. Under these assumptions we show that the cross section can be split into a “distortion matrix element” and a term depending on the neutron target interaction only through the phase shifts of the corresponding elastic neutron scattering. The interference with the “pure break-up” process is discussed. The connection between stripping to bound and unbound states in the limit of zero binding energy is established. A comparison with recent experimental results is given, where the “distortion matrix elements” are calculated, for the sake of simplicity, in the “Butler approximation”.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01668636
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the accuracy of the semiclassical description of reactions in the subcoulomb energy region (1975)
    Springer
    The European physical journal 274 (1975), S. 215-222 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The accuracy of the semiclassical approximation for Coulomb matrix elements is discussed. The absolute values of the matrix elements are in general well approximated, but the agreement of the semiclassical phases with the exact ones is less satisfactory. Therefore, we present a modified semiclassical approximation which essentially improves the values of the phases. This modified semiclassical approximation is obtained by the introduction of a complex saddle point integration method. Since both the absolute values and the phases of the matrix elements are well reproduced by the modified semiclassical approximation, quantities depending on the phase can now also be calculated in the semiclassical manner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437732
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental and theoretical study of the elastic break-up of the alpha particle on58Ni nuclei atE α=172.5 MeV (1979)
    Springer
    The European physical journal 293 (1979), S. 293-299 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The triton-proton angular correlation function has been measured for the58Ni(α, t p)58Ni reaction leading to the ground state of the target nucleus. The obtained experimental data have been interpreted in terms of the direct break-up (fragmentation) of the alpha particle on the target nucleus potential. It is shown that the main features of the measured double differential cross section are well predicted by the DWBA theory of the break-up. The dependence of the elastic and inclusive break-up cross sections upon the fragment-target interaction potentials is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435271
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of the Mott-Schwinger interaction on the elastic scattering of protons (1976)
    Springer
    The European physical journal 278 (1976), S. 139-143 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is demonstrated that the Mott-Schwinger interaction must be taken into account when analyses of polarisation measurements in proton scattering at energies below the Coulomb barrier are to be performed with high accuracy. A treatment of the effect is worked out in perturbation theory, and the reliability of the method is demonstrated. It is shown how the resulting badly converging series for the “Mott-Schwinger amplitude” can conveniently be summed by means of Padé-approximation. Numerical results are presented for several representative cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437768
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Semiclassical description of reactions at energies near the Coulomb barrier (1977)
    Springer
    The European physical journal 281 (1977), S. 391-394 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The modified semiclassical approximation of Coulomb matrix elements is extended to include effects of distorting nuclear potentials in the scattering wave functions. The applicability and efficiency of the proposed semiclassical method are discussed. The advantages of this approximation are shown for a typical heavy-ion transfer reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408188
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    SCA calculations of the inner shell ionization with Dirac-Fock electronic wave functions (1994)
    Springer
    The European physical journal 29 (1994), S. 151-158 
    Details
    ISSN: 1434-6079
    Keywords: 31.70.Hg ; 34.50.Fa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The theory of inner shell ionization for arbitrary atomic shells is reviewed. Emphasis is onL- andM-shells in order to show how the proper screening formalism entering the electronic form factor affects the ionization probabilities. The radial wavefunctions in the form factor are computed as relativistic Hartree-Fock orbitals for both bound and continuum states. The continuum orbitals were evaluated in theV(N−1) potential with correct exchange. These results are then compared with the previous ones using screened hydrogen-like wavefunctions and also with the experimental data in some cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437132
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Inner-shell ionization in near-central collisions of 6.7 MeV/amu4He ions with mid-Z atoms (1992)
    Springer
    The European physical journal 23 (1992), S. 71-79 
    Details
    ISSN: 1434-6079
    Keywords: 34.50.H ; 32.20.R ; 32.70.J
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TheKβ spectra of molybdenum, palladium and lanthanum bombarded by 6.7 MeV/amu4He ions were measured with a transmission curved crystal spectrometer.L andM satellite lines were observed and resolved. Experimental energies are compared with those calculated with a MCDF program.M -shell ionization probabilities are deduced from the measured satellite intensity ratios and compared with theoretical (SCA) predictions. The experimental values are found to be higher than the calculated ones (by a factor of 2 for La and a factor of about 4 for Mo and Pd). The influence of coupling effects, electron wave functions, electron capture, electron correlation and target activation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436705
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    Paper (German National Licenses)
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