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  • 1
    Digitale Medien
    Digitale Medien
    Receptor Interactions at Noradrenergic Neur ones (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 604 (1990), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1990.tb31994.x
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  • 2
    Digitale Medien
    Digitale Medien
    Microscopic transport theory of heavy-ion collisions (1976)
    Springer
    The European physical journal 277 (1976), S. 299-310 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Transport equations of the Fokker-Planck type are derived from a master equation for deeply inelastic collisions. Using the method of spectral distributions, the transport coefficients are calculated for symmetric fragmentations. Analytic formulas are given for the memory time, for the energy-drift coefficient and for the diffusion coefficients which correspond to the excitation of the fragments and the transfer of nucleons. These expressions contain parameters of the basic interaction matrix elements only, which describe excitations and transfers. Agreement with experimental data is obtained for reasonable values of these interaction parameters. Production cross-sections are predicted for superheavy nuclei in the deeply inelastic collisions U+U and U+Cf.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01415605
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  • 3
    Digitale Medien
    Digitale Medien
    Quantum-statistical approach to gross properties of peripheral collisions between heavy nuclei (1976)
    Springer
    The European physical journal 276 (1976), S. 84-84 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01414599
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  • 4
    Digitale Medien
    Digitale Medien
    Entrance-channel coherence in dissipative heavy-ion collisions and compound-nucleus formation (1979)
    Springer
    The European physical journal 290 (1979), S. 335-336 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01408551
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  • 5
    Digitale Medien
    Digitale Medien
    Theoretical estimates for the production of transuranium elements in heavy-ion collisions (1979)
    Springer
    The European physical journal 290 (1979), S. 385-391 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A thick target experiment of the U+U reaction at 7.5 MeV/u is analyzed within the diffusion model for dissipative heavy-ion collisions. Cross sections for the production of superheavy elements as well as probability distributions of excitation energies and spins as function of fragment charge are estimated. The influence from changes of incident energy and projectile-target combination is studied.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01408400
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  • 6
    Digitale Medien
    Digitale Medien
    Transport theory of dissipative heavy-ion collisions (1978)
    Springer
    The European physical journal 288 (1978), S. 401-411 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The non-perturbative quantum-statistical theory of dissipative heavy-ion collisions introduced earlier, is generalized by including explicitly the relative motion of the colliding nuclei. We start from the Liouville equation in the Wigner representation which allows for useful and illustrative interpretations of the resulting quantities and equations. Using the randomness of the coupling matrix elements and the semi-classical approximation for the relative motion we derive a general time-dependent transport equation for the macroscopic Wigner functions (phase-space distribution functions). The limits of weak and strong coupling are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01417724
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  • 7
    Digitale Medien
    Digitale Medien
    Microscopic transport theory of heavy-ion collisions (1982)
    Springer
    The European physical journal 308 (1982), S. 315-327 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Analytical expressions for the diffusion coefficients for the transfer of neutrons and protons in a heavy-ion collision are derived. The mass diffusion coefficient implied by these two coefficients is compared with previous theoretical calculations and the values extracted from experiment for a variety of systems. Drift coefficients are related to the diffusion coefficients and the driving potential by the usual Einstein relations. On approximating the driving potential by a second-order form, the Fokker-Planck equation is solved analytically by the moment expansion method. A comparison of the predictions of this theory with a variety of recent experimental data gives generally good agreement. Thus we conclude that the experimental data currently available can be interpreted in purely statistical terms. Some deviations between theory and experiment indicate a possible influence of shell effects and/or direct transfer processes in the early stages of the reaction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01415880
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  • 8
    Digitale Medien
    Digitale Medien
    Theory of mean primary charge distribution in low energy fission of even-even nuclei (1966)
    Springer
    The European physical journal 197 (1966), S. 246-261 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A molecular model of fission is introduced in which the compound nucleus before scission is described. The ground state wave function is assumed to be a BCS wave function. The single particle wave functions are expanded in terms of eigenfunctions of the unperturbed spherical fragments. The BCS wave function is determined from the minimum condition for the total energy. The fragment masses, the centers of mass, and the total proton and neutron numbers are kept constant. The resulting BCS and Hartree-Bogoliubov equations are solved approximately within the framework of an extended Nilsson model. The numerical results for the charge distribution in low energy fission of236U are in agreement with experiments. The heavier (lighter) fragment has on the average 0.5 protons less (more) than expected on the basis of the socalled unchanged charge distribution (UCD). At magic configurations the charge distribution shows characteristic deviations from the average value due to the shell structure of the fragments. The charge distribution seems to result mainly from three competing effects: a) from the level density of the unperturbed fragments in the vicinity of the Fermi energy. b) from the Coulomb interaction between the fragments, and c) from the asymmetry energy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01325942
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  • 9
    Digitale Medien
    Digitale Medien
    Microscopic transport theory of heavy-ion collisions (1976)
    Springer
    The European physical journal 279 (1976), S. 145-153 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Drift and diffusion coefficients for the variables of mass fragmentation and excitation energy are studied for deeply inelastic collisions. The transport coefficients are obtained in closed form as functions of the parameters of the interaction matrix elements between nucleonic states and as functions of the binding energy of the intermediate rotating quasimolecular configuration. Drift and diffusion coefficients for excitation and mass transfer are related (dissipation fluctuation theorem). In good approximation these relations take the simple form of Einstein's relation between the mobility and the diffusion coefficient of a particle in a medium. For the total mass numbers 100, 250 and 500 the results are discussed in detail. The transport coefficients are compared with experimental results. Within the uncertainties of determination from experimental data, the drift and diffusion coefficients are well described by two previously adjusted parameters of the mean interaction matrix elements. Consequences for the production of superheavy elements in deeply inelastic collisions of U on U or Cf are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01437870
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  • 10
    Digitale Medien
    Digitale Medien
    Microscopic transport theory of heavy-ion collisions (1978)
    Springer
    The European physical journal 286 (1978), S. 263-269 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Effects from shell structure on mass transport coefficients are studied in a schematic model. The diffusion coefficient is slightly reduced by shell effects, the reduction being less than 20% for realistic cases and reasonably high excitation energies. A much stronger effect results for the drift coefficient. This is due to the rapid variation of the shell correction energy as function of the fragmentation variable. The influence of shell effects on the time-dependent mass distributions is illustrated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01408255
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