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  • 1
    Electronic Resource
    Electronic Resource
    Two centre continuum Coulomb wavefunctions in the entire complex plane (1976)
    Springer
    Theoretical chemistry accounts 42 (1976), S. 273-291 
    Details
    ISSN: 1432-2234
    Keywords: Two centre continuum Coulomb wavefunctions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract We solve the Schrödinger Equation for an electron moving in the Coulomb field of two charged nuclei. We take proper account of the analytic structure of the solutions and thus determine their mathematical form in the entire complex plane. These general solutions are then used to construct the two-centre analogue of the usual one-centre Coulomb wavefunctions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00574449
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  • 2
    Electronic Resource
    Electronic Resource
    Summary of the conference (1994)
    Springer
    The European physical journal 349 (1994), S. 315-333 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01288984
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  • 3
    Electronic Resource
    Electronic Resource
    Color degrees of freedom in a quark-glue plasma at finite baryon density (1984)
    Springer
    The European physical journal 24 (1984), S. 361-365 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We derive the color-singlet partition function for a quark-glue plasma with finite quark (baryon number) density by a projection method. Due to colorlessness there is a gradual “freezing” (reduction) of internal degrees of freedom as compared to the Stefan-Boltzmann limit. We find here that this non-perturbative effect is reduced by a finite quark density. A relation between the requirement of colorlessness of all physical states and QCD is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410375
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  • 4
    Electronic Resource
    Electronic Resource
    Die Kernpolarisation in Mesonenatomen bei kugelsymmetrischen Mesonenzuständen (1961)
    Springer
    The European physical journal 164 (1961), S. 374-388 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Die Polarisation des Atomkerns durch das in einem Mesonenatom um den Kern umlaufende Myon wird berechnet. Der Kern wird durch das hydrodynamische Modell vonJensen undSteinwedel beschrieben. Die Rechnungen werden auf kugelsymmetrische Mesonenzustände beschränkt. Die im Rahmen des Jensen-Steinwedel-Modells berechnete Kollektivpolarisation des Kerns verursacht bei Pb eine Verschiebung des 1s 1/2-Terms des Mesonenatoms um etwa 1 keV; sie darf also sicher für die Diskussion der Energieterme des Mesonenatoms vernachlässigt werden. Für die höher gelegenen kugelsymmetrischen Terme wie 1p 1/2 und 2s 1/2 nimmt der Effekt rasch ab. Für die im Rahmen des hydrodynamischen Modells nicht erfaßte Einteilchenpolarisation findet man mit Hilfe der vonDemeur undJoachain für das Deuteron durchgeführten Rechnungen weniger als 100 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01679798
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  • 5
    Electronic Resource
    Electronic Resource
    Eine qualitative Diskussion der kollektiven potentiellen Energie im Quasispinmodell (1963)
    Springer
    The European physical journal 172 (1963), S. 386-401 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The collective potential-energy-surface is calculated for a simple nuclear model consisting of a closed core and onej-shell. This shell can be filled up by one sort of nucleons (protons or neutrons). The residual force acting between nucleons consists of a pairing- and a quadrupol-force. In the quasi-spin-formalism, proposed by A. K.Kerman, the parameters of the collective potential energy are calculated and the collective features of even-even nuclei were discussed qualitatively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378301
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  • 6
    Electronic Resource
    Electronic Resource
    On the stability of superheavy nuclei against fission (1969)
    Springer
    The European physical journal 222 (1969), S. 261-282 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We use the methods, which we developed in a previous paper, for the calculation of potential energy surfaces and lifetimes for superheavy nuclei. Two regions of relative stability against spontaneous fission, which are connected with the magic proton numbersZ=114 andZ=164 and which will both become accessible for experiments in the near future, are discussed. Especially the nuclei aroundZ=164 are investigated here at the first time. The lifetimes for α-decay are also estimated and appear to be long enough for experimental work. Furthermore, we have investigated the dependence of the fission barrier on the level-distributions at the fermi-surface. At the end we discuss the difficulties in the usual microscopic calculations for the fission process and show a way to overcome the limitations and inconsistencies of the usually used Strutinsky-type calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01392125
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  • 7
    Electronic Resource
    Electronic Resource
    Coupled channel analysis of inner-shell vacancy formation in superheavy quasimolecules (1980)
    Springer
    The European physical journal 294 (1980), S. 137-147 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the ionization probability of the quasimolecular 1sσ-state in collisions of very heavy ions with (Z 1+Z 2) α≳1. Multistep excitation processes between bound and continuum states are investigated. Due to the multistep processes the number of created 1sσ-vacancies is typically increased by a factor 2–5 over that obtained within time-dependent perturbation theory (i.e. the one-step processes). Some implications of the many-electron problem and the Pauli principle are discussed. The δ-electron distribution is compared with recent experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435048
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  • 8
    Electronic Resource
    Electronic Resource
    Quasimolecular nuclear optical potentials (1969)
    Springer
    The European physical journal 226 (1969), S. 364-394 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A theory is presented to calculate potentials for the elastic nuclear heavy-ion scattering in a phenomenological way. The density properties of finite nuclei are derived with a schematic ansatz for the interaction energy between nuclear matter. The same interaction energy is applied to the calculation of the real part of the heavy-ion potential, which is of the quasimolecular type. The imaginary part is connected with the outflow time of nuclear matter out of compressed regions of overlapping nuclei. The resulting cross section for the elastic O16-O16 scattering reproduces the experiment up to 30 MeV quite well. An effective compression modulus of the S32 compound system can be deduced from the scattering experiment. It results to be about 200 MeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01399105
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  • 9
    Electronic Resource
    Electronic Resource
    The asymmetrie two center shell model (1972)
    Springer
    The European physical journal 251 (1972), S. 431-457 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The previously developed two center shell model for symmetric fission has been extended to break-ups into unequal fragments. The potentials of the separate fragments have equal depth. The rounded barrier between them can have varying height. The two fragments can also have different deformations. Generalizedl ·s- andl 2-terms are included. This allows for the description of a great variety of nuclear shapes. The mathematical details are presented together with the analytically solvable matrix elements. For a few asymmetric fission processes the level spectra have been calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01391737
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  • 10
    Electronic Resource
    Electronic Resource
    Electron shells in over-critical external fields (1972)
    Springer
    The European physical journal 257 (1972), S. 62-77 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract When the charge of a nucleus exceedsZ=Z cr≈ 164–172 the energy of the 1s-electron level is lowered beyond the critical value of −m e c 2. Then this bound level is degenerated with negative energy continuum solutions of the Dirac equation and becomes a resonance, whose shape varies and is approximately of Breit-Wigner type forZ−Z cr≳5. The physical meaning of this resonance can be understood most easily if the 1s-level is unoccupied (K-hole). In this case a positron may escape ifZ〉Z cr, a process, that can be interpreted as auto-ionization of the positron. This fundamentally new process of quantum electrodynamics of strong fields can be tested experimentally by scattering very heavy ions (Z≧80) on each other since in such collisions superheavy electronic molecules occur (superheavy quasimolecules).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01398198
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