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  • 1990-1994  (8)
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Material
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Year
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  • 1
    Electronic Resource
    Electronic Resource
    Proton halos in100Sn using a relativistic shell model (1994)
    Springer
    The European physical journal 350 (1994), S. 91-92 
    Details
    ISSN: 1434-601X
    Keywords: 21.60C ; 21.10D ; 27.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The isotope100Sn was produced recently by nuclear fragmentation of124Xe projectiles at 1095 A MeV using FRS at the heavy-ion synchrotron SIS at the GSI and by using a112Sn beam delivered to the LISE by the GANIL cyclotron. We report the first relativistic calculation of this doubly magic nucleus100Sn. The calculations are based on the relativistic mean field model (RMF) which represents a relativistic shell model description of finite nuclei. We demonstrate that the doubly-magic nucleus100Sn is an excellent tool for testing the nuclear shell model close to the proton drip line. A clear proton halo is predicted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290673
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ideal nuclear fluid dynamics at ultra-relativistic energies (1992)
    Springer
    The European physical journal 54 (1992), S. 459-462 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate the reaction O+Au at 200 AGeV in an ideal relativistic (3+1)-dimensional one-fluid hydrodynamical model. We correct former calculations which contained acausal matter transport, leading to contradictions with experimental data for the baryonic rapidity distribution. We find that the corrected results are in good agreement with data, casting new light on the question of the applicability of ideal one-fluid hydrodynamics to heavy-ion collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01559465
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A general numerical solution of collective quadrupole surface motion applied to microscopically calculated potential energy surfaces (1992)
    Springer
    The European physical journal 343 (1992), S. 25-34 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.E
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a numerical method based on finite elements capable of solving the general Hamiltonian for quadrupole surface motion including deformation-dependent masses and moments of inertia. We illustrate the power and accuracy of this method by comparing the resulting energies, B(E2)-values, and quadrupole moments to well-known analytical limits (Harmonic Oscillator, Wilets-Jean potential). We extend the deformation and spin regions accessible to previous solution methods which allows for a unified description of phenomena like, e.g., very strongly deformed states (β 0 ∼ 1.5) and the usual low-energy quadrupole excitations. Finally we apply this model to the microscopically calculated potential energy surfaces of190Pt and138U derived from the pseudo-symplectic model and calculate energies, B(E2)-, B(E4)- and quadrupole-values, comparing them to experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291593
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The excitation function of Au + Au in the framework of the (2+1)-fluid model (1993)
    Springer
    The European physical journal 346 (1993), S. 251-252 
    Details
    ISSN: 1434-601X
    Keywords: 25.70 Np
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the excitation function of the reaction Au+Au in the frame work of the recently developed (2+1)-fluid model. In the (2+1)-fluid model, it is assumed that two baryonic fluids formed by the projectile and target nucleons produce a third hadronic fluid via inelastic nucleon-nucleon collisions. For this third fluid we use the equation of state of an interacting hadron gas obtained within the relativistic mean field model, including a first order phase transition. The dependence of the pion mean transverse momentum is investigated to observe the predicted plateau in the region of the phase transition of the hadronic matter to the quark-gluon plasma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01306086
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Fluid-dynamics of the nuclear surface Fermi-layer (1990)
    Springer
    The European physical journal 335 (1990), S. 139-146 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Ev ; 21.10.Re ; 67.90.+z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the framework of the long-mean-free-path approach the fluid-dynamical model of the nuclear surface as a spherical Fermi-layer is formulated. It is shown that the model reproduces known results of Fermi-drop dynamics and permits the description of more low energy collective states in spherical nuclei. The quantum-capillary branch of low-lying surface excitations is predicted. The model gives an adequate description of both lowest and highest experimental collective energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294468
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The three-dimensional (2 + 1)-fluid model for relativistic nuclear collisions (1993)
    Springer
    The European physical journal 346 (1993), S. 209-216 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Np
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new multi-fluid model is constructed for describing high-energy heavy-ion collisions. It is assumed that two baryonic fluids formed by the projectile and target nucleons produce a third hadronic fluid via inelastic nucleon-nucleon collisions. The production and expansion dynamics of the hadronic fluid are investigated in detail. Two equations of state for this fluid are considered: one corresponding to an ideal gas of pions and resonances and another one corresponding to an interacting hadron gas described by the relativistic mean-field model. The effects of freeze-out and non-zero pion chemical potential are investigated. The rapidity and transverse momentum spectra of secondary pions are compared with the experimental data forS + S collisions at 200 GeV/nucleon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01306081
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Shape transitions and shape coexistence in the Ru and Hg chains (1991)
    Springer
    The European physical journal 338 (1991), S. 261-270 
    Details
    ISSN: 1434-601X
    Keywords: 21.60E
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The General Collective Model (GCM) is revised and applied to the chain of182–196Hg- and96–108Ru-isotopes. Calculated energy spectra, absolute B(E2) values and Quadrupole moments are presented and compared to experiment. For many of these nuclei a coexistence of spherical and triaxial shapes was found. Additionally we investigated the shape transition within the Ru-chain from prolate (96Ru) over spherical (98Ru) to triaxial (A ≧100). The results are compared to microscopic and IBA calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01288188
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Theg R -factor of rare-earth nuclei in the Geometric Collective Model (1994)
    Springer
    The European physical journal 348 (1994), S. 1-8 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.E
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A parameter-free expression for the collective magnetic dipole operator ofee-nuclei is derived within the Geometric Collective Model. Using this result we give an analytical formula for the (g R −Z/A)-value of the lower spin groundstate band members foree-nuclei. The general procedure is explained discussing the results (energies, B(E2)-values and quadrupole moments) for166–170Er-isotopes extensively. The groundstate bandg R -factors of the isotopes166–170Er,153–160Gd,160–164Dy,170–174Yb are calculated and compared with experimental data and results of other models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291645
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    Paper (German National Licenses)
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