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  • 21.60.Ev  (3)
  • 23.90.+w  (2)
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Materialart
Erscheinungszeitraum
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  • 1
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 21.60.Ev ; 23.20.CK ; 27.60.+j
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01292577
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Effective boson number calculations in Mo and Cd isotopes (1990)
    Springer
    The European physical journal 335 (1990), S. 271-278 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.60.Ev
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01304705
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 21.60.Ev
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01290922
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Odd-even staggering of heavy cluster spontaneous emission rates (1986)
    Springer
    The European physical journal 325 (1986), S. 435-439 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.90.+w ; 27.90.+b
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Experimentally observed enhanced14C and24Ne emission rates from even-even parents in comparison with that from even-odd or odd-even nuclei are explained in the framework of the analytical superasymmetric fission model, by taking various prescriptions for the zero point vibration energy of even-even, even-odd, odd-even and odd-odd emitters. Longer half-lives than previously computed are obtained by extrapolating the present prescriptions to emitted clusters heavier than24Ne.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01290046
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  • 5
    Digitale Medien
    Digitale Medien
    Cold fission as heavy ion emission (1987)
    Springer
    The European physical journal 328 (1987), S. 309-314 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.90.+w ; 25.85.Ca ; 27.90.+b
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01290499
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