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  • 1990-1994  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Solution of the10Li-Puzzle (1993)
    Springer
    The European physical journal 344 (1993), S. 381-393 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Dr ; 25.70.Cd ; 27.20.+ n
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mass of10Li has been measured with two different reactions:9Be(13C,12N)10Li,E Lab=336 MeV, and13C(14C,17F)10Li,E Lab=337 MeV. The mass excess of 33.445(50) MeV is deduced from theQ-value measurement.10Li is found to be particle-unstable with respect to one-neutron emission by 0.42(5) MeV. In the analysis of the first reaction a low lying excited state is found at 0.38(8) MeV. This state and the ground state can be most probably identified as the 1+/2+-doublet coupled from the [π 1p3/2 ⊗ν 1p 1/2] configuration, the 1+-state being the ground state. The (13C,12N)-reaction populates the 1+-state strongly due to a spin-isospin-flip character of the dominant part of the transition amplitude. The 2+-member corresponds to the mass given by Wilcox et al. A second excited state is observed at 4.05(10) MeV with a width of 0.7(2) MeV, it can be associated with theν 1d 5/2-strength. The second reaction is fully supporting the interpretation of the ground state doublet. The excited state at 4.05 MeV is not observed in this reaction and indeed it should not, because the reaction does not populate in first order excited neutron configurations. The levels are well described by mean field calculations including pairing correlations. The lowest resonance in the calculations is theν 1/2−-configuration, whereas theν 1/2+-configuration shows at the neutron threshold a strong non-resonant contribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01283193
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Refractive scattering and reactions, comparison of two systems:16O+16O and20Ne+12C (1993)
    Springer
    The European physical journal 346 (1993), S. 189-200 
    Details
    ISSN: 1434-601X
    Keywords: 24.10.-i ; 24.10.Eq ; 24.20.Ht ; 25.70.Cd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Elastic, inelastic scattering as well as one-neutron transfer channels have been measured over a wide angular range for systems16O+16O at the incident energy of 350 MeV and20Ne+12C at 390 MeV, respectively, using the Q3D magnetic spectrometer. In both cases differential cross sections have been measured down to about 50 nb/sr (or dσ/dσ R≤10−4) at large angles. For the16O+16O system refractive contributions are found at the level of these cross sections, whereas in the20Ne+12C case a steeper decrease of the differential cross section with the angle is observed and the refractive contribution can not be determined. The elastic scattering data have been analyzed using standard Woods-Saxon potentials and potentials calculated in different versions of the double-folding model. Some properties of these potentials are tested in the calculations for inelastic scattering and one-neutron transfer within the DWBA. With the refractive pattern observed for the16O+16O system, the scattering and transfer data are found to be sensitive to the interaction potential at small internuclear distances down to about 2.5 fm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01306079
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Pairing effects in nucleon transfer reactions in the system144Sm+88Sr at 4.7 MeV/u (1990)
    Springer
    The European physical journal 336 (1990), S. 71-89 
    Details
    ISSN: 1434-601X
    Keywords: 24.10-i ; 25.70.Cd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Proton and neutron transfer populating low-lying states have been studied in the system144Sm+88Sr at an energy below the Coulomb barrier. The experimental cross sections for the single proton transfer are well reproduced by DWBA-calculations using spectroscopic information from light ion reactions. The two-proton transfer appears enhanced relative to the uncorrelated sequential transfer of single protons. The same holds for the transfer of proton pairs, the enhancement is kept for the second pair. This is interpreted as a supercurrent between two superfluid nuclear proton-pair wave functions: more mass and charge is transported per time unit in pairs than by single nucleons. Neutron transfer is observed with large cross sections and is found to contribute to the energy loss observed in the transfer reactions. For mixed proton-neutron transfers the sequential nature of the transfer reactions is established in a similar way as for the two-proton and two-neutron transfer; in the latter case no enhancement is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01904165
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Total neutron multiplicities as a measure of the violence in heavy ion reactions (1992)
    Springer
    The European physical journal 342 (1992), S. 319-327 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Jj ; 25.85.Ge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Energy spectra and multiplicities of neutrons from the reaction system 838 MeV32S projectiles on197Au have been measured in coincidence with binary fragmentations. Neutron detection was performed simultaneously in a 4π scintillator sphere and by time-of-flight. The linear momentum transfer (LMT) and the excitation energyE CN * are deduced with the folding angle technique. Neutron multiplicities are compared for consistency and discussed as a measure of LMT andE CN * . The saturation ofM 4π (E CN * ) beyondE CN * ≈400 MeV seen for several systems of high fissility (x≧0.8) is attributed to the spreading of the folding angle distribution and the increasing competition of charged particle evaporation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291516
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  • 5
    Electronic Resource
    Electronic Resource
    Mass spectroscopy of13Be (1992)
    Springer
    The European physical journal 343 (1992), S. 489-490 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Dr ; 25.70.Cd ; 27.20.+n
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mass of 13 Be has been measured with the reaction 13 C(14 C,14 O)13 Be at E Lab =337 MeV. A Q-value of Q 0=−37.02(5) MeV was obtained and the mass excess is M.E.=35.16(5) MeV. If the observed line corresponds to the ground state,13 Be is particle unstable with respect to the oneneutron emission by 2.01 MeV. The observed line width of 0.3(2) MeV supports an assignment ofJ π=5/2+ or 1/2−, but excludesJ π=1/2+. An excited state is seen at 3.12(7) MeV; there are indications of a second excited state at 6.5(2) MeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289828
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    Paper (German National Licenses)
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