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  • Articles: DFG German National Licenses  (6)
  • 21.60.Ev  (3)
  • 25.85.Ca  (2)
  • 27.60.+J  (1)
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  • Articles: DFG German National Licenses  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Evidence for the two-body nature of theE1 transition operator in the sdf-interacting boson model (1989)
    Springer
    The European physical journal 332 (1989), S. 29-32 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Ev ; 23.20.CK ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two new absolute transition rates are reported for the nucleus144Sm following an (α, α′) Coulomb excitation study. They are B(E3; 3−→ 0+)=(38±3) W.u. and B(E1;3− → 2+)=(2.8±0.4)×10−3 W.u. This large E1 matrix element, along with the previously known B(E1; 1− →+) value support the interpretation of the 1− state in this nucleus as 2-phonon 2+ × 3− excitation. In the frame of the IBM-1 +f-boson model we show the need for a two-body term in the E1 transition operator. Estimates for the strengths of the one and two-body parts of the E1 transition operator are obtained from these experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292577
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Shape change and shape coexistence in134Pr (1992)
    Springer
    The European physical journal 344 (1992), S. 227-228 
    Details
    ISSN: 1434-601X
    Keywords: 23.20.Lv ; 27.60.+J
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The band structure of doubly odd nucleus134Pr has been studied by means of the reaction119Sn(19F,4n) at 87 MeV bombarding energy. Rotational bands built on πh11/2⊗vh11/2 and πh7/2⊗vh11/2 configurations has been observed. A band consisting of quadrupole transitions, probably involving the vi13/2[600]1/2+ orbital was also weakly populated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291710
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Effective boson number calculations in Mo and Cd isotopes (1990)
    Springer
    The European physical journal 335 (1990), S. 271-278 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Ev
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effects of the neutron-proton interaction on the low-lying levels of Mo and Cd isotopes have been considered in the frame of the IBA-1 model by taking into account an effective boson number (N eff). Both an empirical procedure based on previous IBA-2 mixing calculations and theN p N n scheme provide comparableN eff values. Level spectra and electromagnetic transitions are investigated. The results support the idea that IBA-1 calculations with a suitableN eff can largely simulate IBA-2 mixing calculations, taking advantage of simplicity and a smaller number of parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01304705
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Inertia and fission paths in a wide range of mass asymmetry (1989)
    Springer
    The European physical journal 333 (1989), S. 291-298 
    Details
    ISSN: 1434-601X
    Keywords: 23.90.+ w ; 25.85.Ca ; 27.90+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Effective inertias for cold fission, heavy ion radioactivities and alpha decay are calculated within the Werner-Wheeler approximation by using two parametrizations of intersecting spheres, with either constant radius (cluster-like shapes) or constant volume (more compact shapes) of the light fragment. A correction for the center of mass motion of a system with axial symmetry is introduced. General analytical relationships are obtained which are easily particularized for various cases of practical interest. If the mass number of the light particle is lower than 31, the action integral calculated using the Yukawa-plus-exponential potential takes lower values for cluster-like shapes than for more compact ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294517
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    An extended IBA consistent-Q formalism applied to Ru and Pd isotopes (1986)
    Springer
    The European physical journal 324 (1986), S. 387-392 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Ev
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A consistent-Q formalism extended to an IBA-1 Hamiltonian applicable also in theU(5) limit, is applied to Ru and Pd isotopes withN around 60. A good description of energy levels andE2 transitions in these nuclei is obtained. The model is able to reproduce the main features of this transitional region, characterized by both rigid triaxial deformation andγ-softness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290922
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Cold fission as heavy ion emission (1987)
    Springer
    The European physical journal 328 (1987), S. 309-314 
    Details
    ISSN: 1434-601X
    Keywords: 23.90.+w ; 25.85.Ca ; 27.90.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The last version of the analytical superasymmetric fission model is applied to study cold fission processes. Strong shell effects are present either in one or both fission fragments. A smooth behaviour is observed when the proton or the neutron numbers are changed by four units. IncreasingZ andN, in the transuranium region, a sharp transition from asymmetry with a large peak-to-valley ratio to symmetry atZ=100 and/orN=164 is obtained. The transition toward asymmetry at higherZ andN is much smoother. The most probable cold fission light fragments from234U,236U,239Np and240Pu are100Zr,104Mo,106Mo and106Mo, respectively, in good agreement with experimental data. The unified treatment of alpha decay, heavy ion radioactivities and cold fission is illustrated for234U — the first nucleus in which all three groups have been already observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290499
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    Paper (German National Licenses)
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