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  • Articles: DFG German National Licenses  (12)
  • 2000-2004  (1)
  • 1990-1994  (5)
  • 1980-1984  (6)
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  • Articles: DFG German National Licenses  (12)
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Early arteriolar and capillary changes in streptozotocin-induced diabetic rats and intraperitoneal hyperglycaemic rats (1982)
    Springer
    Diabetologia 22 (1982), S. 344-348 
    Details
    ISSN: 1432-0428
    Keywords: Diabetes ; hyperglycaemia ; microvasculature ; microangiopathy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Comparison of intestinal arteriolar characteristics in vivo were made in normal rats, normal rats injected intraperitoneally twice daily with either 0.15 mmol/l saline or 16.6 mmol/l glucose in 0.15 mmol/l saline (total value 5% of body weight), and in streptozotocin treated rats (plasma glucose 〉 22.2 mmol/l). Each regimen was continued for 4–5 weeks before the study. Interperitoneal injection of glucose increased the plasma glucose concentration by 0.8–1.6 mmol/l for 2–2.5 h. The microvascular characteristics of normal and saline injected rats were identical. Results obtained in glucose-treated and diabetic animals were very similar and included: 1) resting arteriolar vasodilation, 2) subnormal dilation at removal of all vascular control with adenosine, 3) total arteriolar vessel wall, including smooth muscle, cross-sectional area and wall to lumen ratio one-third to one-half less than normal, and 4) capillary separation distances increased above normal by 40%–50%. The results indicate that the morphological and functional changes in intestinal arterioles and capillaries found in diabetic rats after 4–5 weeks can be reproduced in the intestinal tissues of a normal animal exposed to intermittent increases in intraperitoneal glucose concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00253579
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    Paper (German National Licenses)
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Transfer and fragmentation reactions of14N at 60 MeV/u (1990)
    Springer
    The European physical journal 337 (1990), S. 425-437 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Np ; 25.70.Cd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Inclusive energy spectra and cross sections of reaction products close to the14N projectile (11C,12C,13C,15N and15O) have been measured in the angular rangeθ L =1.2°–4.2° at an incident energy of 60 MeV/u for five different target nuclei (12C,27Al,58Ni,90Zr and208Pb). Two components are found to be systematically present in the energy spectra of the carbon isotopes, the first similar to that observed at relativistic energies and the second shifted down in energy characteristic for a very dissipative process. The dependence of the differential and integrated cross sections on the target mass indicates that the two-body final channels (14N,13C), (14N,15N) and (14N,15O) are strongly correlated to the fragmentation channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294980
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    Paper (German National Licenses)
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  • 4
    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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  • 5
    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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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Proton transfer in quasi-elastic and deep-inelastic reactions in the systems86Kr on88Sr,90Zr and92Mo at energies close to the coulomb barrier (1982)
    Springer
    The European physical journal 307 (1982), S. 113-140 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Reaction products corresponding to the transfer of one and several protons have been measured over a large angular range for incident energies of 380 MeV and 400 MeV in reactions of86Kr with88Sr,90Zr and92Mo. For transitions with smallQ-values (total kinetic energy loss TKEL≦10 MeV) the transfer probabilities are deduced. The magnitudes and slopes of these probabilities as function of the distance of closest approach between two nuclei are discussed. The results for single proton transfer are well described by tunneling, whereas the transfer of two and more nucleons into low lying states of the final nuclei seems to be influenced by intermediate transfer steps with larger TKEL. The data give the possibility to discuss the relation between deep-inelastic and quasi-elastic processes. The deep-inelastic data are analyzed successfully by including deformations, charge transfer and statistical fluctuations into the frictional model of Gross and Kalinowski.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414827
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Pairing effects in quasi-elastic neutron transfer between Tin isotopes (1983)
    Springer
    The European physical journal 313 (1983), S. 189-195 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The transfer of neutrons between low-lying states of Tin isotopes has been measured in the reaction120Sn→112Sn at energies below the Coulomb barrier. The transfer probabilities are deduced as function of the classical minimum distance from transfer and scattering cross sections at different angles and two energies. At the smallest distances very large transfer probabilities,p t =0.5, are observed for one- and two-neutron transfer. The two-neutron transfer is significantly enhanced as compared to a successive independent single-nucleon transfer. The definition of enhancement is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01417226
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Interaction of 80 MeV12C with88Sr; Neutron transfer, inelastic scattering and spin alignment of the 2+ State of12C (1982)
    Springer
    The European physical journal 305 (1982), S. 135-142 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a Q3D magnetic spectrometer the elastic and inelastic scattering of12C on88Sr and the neutron pick-up (12C,13C) has been studied. The spin alignment of the inelastically excited 2+ state of12C (4.43 MeV) has been deduced from the line shapes broadened by theγ-decay in flight. Thus for eachm-substate a full angular distribution was obtained. Them=1 substate shows a shifted interference minimum, which is explained by the different strength of the Coulomb and nuclear amplitudes in them-substates. The analysis of the data on elastic scattering, inelastic scattering, alignment and the neutron transfer can be described consistently with one choice of the optical model parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415021
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  • 10
    Electronic Resource
    Electronic Resource
    Selection of cold transfer and enhanced neutron-pair transfer in the 206 Pb + 118 Sn reaction (2003)
    Springer
    The European physical journal 20 (2003), S. 153-156 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The neutron transfer in a very heavy asymmetric nuclear system, in 206 Pb + 118 Sn has been measured using particle- $\gamma$ coincidence techniques with position-sensitive detectors, 5 EUROBALL-Cluster detectors (EB) and the Heidelberg-Darmstadt NaI-CRYSTAL BALL (CB). The fragments are identified via the known $\gamma$ -decays of the lowest excited states using the high resolution of EB. Using the unique feature of the set-up with the CB, transfer to well-defined final channels with known quantum numbers is selected using the high-efficiency multiplicity filter of the CB with no second $\gamma$ -ray, i.e. without feeding. The enhancement in the two-neutron transfer is deduced, for population of the low-lying super-fluid 2 + states in 120 Sn and 116 Sn, while the 2n-transition remains in the ground state for the recoiling 20X Pb-nuclei. Large enhancements up to EF $\simeq 10^3$ are observed. This is the first observation of neutron pair-transfer enhancement for a heavy nuclear binary system with superfluid properties with experimentally separated levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/i2002-10342-y
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    Paper (German National Licenses)
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