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  • 21.10.Ma  (3)
  • 61.80.Jh  (2)
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Materialart
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  • 1
    Digitale Medien
    Digitale Medien
    Xenon-beam-induced atomic transport through Cr/Al and Cr2N/Al interfaces (1993)
    Springer
    Applied physics 57 (1993), S. 187-193 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 61.80.Jh ; 71.30.+h ; 79.20.Rf
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Cr layers (60–75 nm) on Al substrates and Cr2N layers (40–120 nm) on Al+3 wt.% Mg substrates were irradiated at 80 K and 300 K with 150–900 keV Xe-ions. The ion-beam-induced interface mixing was analyzed by means of Rutherford Backscattering Spectrometry (RBS). Both systems exhibit fairly small mixing rates, with those of Cr/Al being enhanced at 300 K target temperature, due to radiation-enhanced diffusion. The observed interface broadening is compared with predictions of ballistic and thermal spike mixing models. The low-temperature mixing rates in the system Cr/Al are underestimated by the ballistic model, but are rather well reproduced by local spike models. Mixing in the Cr2N/Al system at both temperatures, on the other hand, seems to be rather well described by the ballistic model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00331443
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  • 2
    Digitale Medien
    Digitale Medien
    Ion beam mixing of Pt marker layers in Al (1996)
    Springer
    Applied physics 63 (1996), S. 31-36 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 61.80.Jh ; 68.55.Ln
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We have studied the ion beam mixing of Pt marker layers which were 1 nm thick and buried 55 nm deep in Al. The samples were irradiated with Ne, Ar, Kr, Xe, and Pb ions with ion energies ranging from 75 to 600 keV and damage energy densities from 0.17 to 2.0 keV/nm. The depth distributions of both the implanted ions and the marker atoms were measured with Rutherford backscattering spectrometry. The experimental mixing efficiency ofη = 0.856(24) nm5/keV is about ten times as high as was to be expected from the ballistic model and the local spike models. We suggest a connection between this unexpectedly high mixing efficiency and the vanishing primary solid solubility of the marker element in the host matrix.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01579743
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  • 3
    Digitale Medien
    Digitale Medien
    Double neutron capture in62Ni (1992)
    Springer
    The European physical journal 343 (1992), S. 7-14 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Ma ; 23.20.Lv ; 25.40.Lw ; 27.50. + e
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The γ-radiation following single and double neutron capture in isotopically enriched62Ni was studied at the high flux reactor of the Institut Laue-Langevin, using a pair and Compton suppressed germanium detector. Measurements before and after 170 d of breeding were performed. The γ-ray fluxes through63Ni and64Ni are discussed; several new levels and spin-parity assignments were found. On the basis of the known discrete levels and the low-energy neutron resonances, level density parameters were determined within the Constant Temperature Fermi Gas model. The neutron binding energies were measured asB n (63Ni)=6837.92(18) keV andB n (64Ni)=9657.64(24) keV. The63Ni (n, γ) cross section for reactor neutrons was measured to be σ=20 −2 +5 b.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01291590
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  • 4
    Digitale Medien
    Digitale Medien
    Complete spectroscopy of51,52V via the50,51V(n, γ) reactions (1991)
    Springer
    The European physical journal 338 (1991), S. 371-387 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Ma ; 23.20.Lv ; 25.40.Lw ; 27.40.+ z
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The gamma-ray spectra emitted after thermal neutron capture in highly enriched50V andnatV targets have been studied using in-pile targets at the ILL high flux reactor and pair and germanium detectors. The neutron binding energies in51V and52V were determined to beB n (51V)=11051.11(17) keV andB n (52V)=7311.22(26) keV. The thermal neutron capture cross-section in50V was measured to be 21 −2 +4 b. From 724 lines attributed to51V, 330 transitions, comprising 90% of theγ-ray flux, were placed into the level scheme. Fifty-nine primary dipole transitions from the 11/2+ or 13/2+ capture states in51V were established from which the E1 strength distribution was deduced. The energy scaling of these primary transitions was found to follow the E1-giant dipole resonance dominance. Many new levels were established; a number of states proposed in previous (d,p) and (n,γ) work were confirmed from their primary population and decaying secondary radiations. The density of levels in the high spin (9/2≦I≦15/2) region was parametrized with the Fermi gas model. The spin distributions of51V were analyzed and a spin cut-off parameter σ=2.8 (3) was deduced. — A nearly complete level scheme of52V up to 3.5 MeV excitation and similar results concerning the level density and the primary γ-ray spectrum were obtained in the51V (n, γ)52V study.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01295765
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  • 5
    Digitale Medien
    Digitale Medien
    Thermal neutron captureγ-ray spectroscopy of59Ni and61Ni (1993)
    Springer
    The European physical journal 345 (1993), S. 143-153 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Ma ; 23.20.Lv ; 25.40.Lw ; 27.50.+ e
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Theγ-radiation emitted after thermal neutron capture in isotopically enriched58Ni and60Ni was measured at the ILL high flux reactor by means of Ge/NaI detectors operated in Compton suppression and pair spectrometer mode. The neutron binding energies were determined asB n (59Ni)=8999.15(23) keV and Bn(61Ni)=7820.07(20) keV; some 95% of the totalγ-ray fluxes through59,61Ni were assigned. Theγ-ray strength functions of the primary transitions and the level densities are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01293337
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