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  • 1990-1994  (7)
  • 27.50.+e  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    High spin states in the transitional nucleus88Mo (1992)
    Springer
    The European physical journal 342 (1992), S. 257-265 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Cs ; 23.20.Lv ; 25.70.Jj ; 27.50.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The reaction58Ni(36Ar,α qρ)88Mo has been studied at 145 MeV beam energy. A detector array consisting of the OSIRIS spectrometer, four charged-particleΔE detectors and seven NE213 neutron detectors has been used to meaure the gamma radiation inγγ- and particle-γγ-coincidence mode. The level scheme of88Mo has been extended up to 11.6 MeV excitation energy and probable spin 23ħ; some 70 transitions and 40 levels have been identified. Spin assignments have been proposed on the basis of measured DCO ratios. Hartree Fock cranking calculations of the Total Routhians and shell model calculations of the high spin states are presented which imply near-sphericity of the yrast line up to the highest spins found. A classification of the high spin states according to their leading seniority is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291507
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Identification of near-spherical multiparticle-hole states in89Tc (1992)
    Springer
    The European physical journal 342 (1992), S. 121-122 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Cs ; 27.50.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excited states in the nucleus89Tc have been identified for the first time by measuring evaporated particle-γγ-coincidences via the fusion reaction58Ni +36Ar at 149 MeV. Nine γ-ray transitions built upon the (9/2+) ground state have been found, reaching up to a probable spin of (33/2+) at 5.3MeV excitation energy. The levels are interpreted with the shell model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294497
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    High spin states in66,68Ge (1992)
    Springer
    The European physical journal 343 (1992), S. 371-372 
    Details
    ISSN: 1434-601X
    Keywords: 27.50.+e ; 25.70.Gh ; 23.20.Lv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High spin states of66,68Ge have been investigated at the FN Tandem accelerator of the University of Köln via the reactions40Ca(32S,α2p,4p)66,68Ge at a beam energy of 100 MeV and58Ni(16O,α2p)68Ge at 65 MeV. The OSIRIS spectrometer with 12 escape suppressed Ge detectors was used to measure γγ coincidences and γ-ray angular distributions. In66Ge (68Ge) 33 (22) new levels were found and 63 (62) new γ-transitions were placed in the level scheme. Both nuclei show a rather complicated but similar excitation pattern, ruled by the interplay of quasiparticle and collective degrees of freedom. The results are compared to the recently published EXVAM calculations for68Ge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291540
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Identification and structure of high spin particle-hole states in89Mo (1993)
    Springer
    The European physical journal 344 (1993), S. 395-403 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Cs ; 23.20.Lv ; 27.50.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Particle-γ andγ-coincidences of the reaction58Ni(36Ar, 4pn)89Mo have been used to gain more information about high spin states in89Mo and to establish the yrast sequence up to 7.6 MeV excitation energy and probable spin 37/2 ħ. Spins and parities were assigned on the basis of DCO-ratios measured with the OSIRIS spectrometer and a large volume Ge detector placed at 162° to the beam. Furthermore, aγ-ray angular distribution experiment was carried out using the reaction58Ni(35Cl, 3pn)89Mo. As in the neighboring isotopes88Mo and90Mo, the positive-parity high-spin states can be grouped into shell model multiplets characterized by increasing seniorities of proton particles and neutron holes in the 1g9/2 shell. The negative-parity states can be explained with one nucleon moving in thep 1/2 orbit. The energies and wave functions of these states have been deduced by means of the shell model code RITSSCHIL. The 2584 keV (21/2+) is an isomeric state the mean life of which has been estimated from delayedγγ-coincidences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01283194
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Anomalous behaviour of transition probabilities in75Kr (1990)
    Springer
    The European physical journal 336 (1990), S. 391-402 
    Details
    ISSN: 1434-601X
    Keywords: 27.50.+e ; 23.20.En ; 23.20.Gq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two collective bands of75Kr have been extended up to spin 21/2 using the compound reactions64Zn(14N,p2n)75Kr and50Cr(28Si, 2pn)75Kr. Spins and parities were assigned from neutron-gatedγ-ray angular distributions and excitation functions using the OSIRIS anti-Compton spectrometer. The bands are interpreted to be built on the well-deformed Nilsson states: [442] 5/2 and [301] 3/2. Energies for both bands and the order of magnitude of the mixing ratios in thef 5/2 band can be reproduced within the single-particle-plus-rotor model, while the experimentalQ(I→I−1)/Q(I→I−2) ratios, deduced from mixing ratios and branching ratios, exhibit large deviations by a factor 4 to 6 from theoretical values (which are around one). An explanation of this effect may be found by treating the two rotational bands each as a result of mixing between rotational bands of oblate and prolate states; thus explaining the large difference between B(E2,I→I−1) andB(E2, I →I−2) in the bands of75Kr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294113
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Transitional quadrupole moments in83Y (1994)
    Springer
    The European physical journal 347 (1994), S. 285-286 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Ev ; 27.50.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Doppler shift attenuation lifetime measurements have been carried out for the 3qp and isomeric rotational bands in83Y using the reaction58Ni(28Si,3p). While the transitional quadrupole moments in the 3qp bands are slightly lower than in the 1qp bands, we found evidence for a strong reduction in ¦Qt¦ for the isomeric band.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289797
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Deformations and shape changes in81Y (1994)
    Springer
    The European physical journal 350 (1994), S. 189-197 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Ev ; 27.50.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High spin states in81Y up to the probable 33/2+ and 29/2− yrast states have been measured via the reaction58Ni(28Si,αp, using the Cologne tandem accelerator. Directional correlations of oriented nuclei were determined and the level scheme was extended with lifetimes measured by means of DSA and recoil distance techniques. Reduced transition strengths inferred from lifetimes were consistent with the results of Hartree-Fock-Bogolyubov calculations, which predict a nearly axially symmetric deformation ofβ 2≈0.37 for theπ=+ band. Predictions reveal an alignment driving the system to a smaller and triaxial deformation withβ 2=0.23 andγ=−30°, although the data show this crossing to be somewhat delayed. Particle-rotor calculations for the one-quasiparticle bands corroborate the predictions of deformation parameters based on the cranking model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289582
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    Paper (German National Licenses)
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