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  • Electronic Resource  (5)
  • 21.60.Ev  (3)
  • 52.75.-d  (2)
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  • Electronic Resource  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Laser nitriding of iron: Influence of the laser parameters on the nitriding efficiency (1996)
    Springer
    Applied physics 62 (1996), S. 231-236 
    Details
    ISSN: 1432-0630
    Keywords: 61.80.Ba ; 52.75.-d ; 81.60.Bn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Laser nitriding of Armco iron in nitrogen was studied for KrF-excimer-laser irradiation. The influence of the energy density and number of pulses on the nitrogen take-up and the nitride phases formed was investigated using Resonant Nuclear Reaction Analysis (RNRA) and Mössbauer spectroscopy. Besides the original a-iron, austeniteγ-Fe(N), martensiteα′-Fe(N),ε-Fe2+χN, andα″-Fe16N2 were identified. The fraction of the e-phase was found to increase with the number of pulses and the energy density. A threshold energy density of 1.8(2) J/cm2 for the laser nitriding process was found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575086
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Laser nitriding of iron: Nitrogen profiles and phases (1995)
    Springer
    Applied physics 61 (1995), S. 1-5 
    Details
    ISSN: 1432-0630
    Keywords: 61.80.Ba ; 52.75.-d ; 81.60.Bn ; 76.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Armco iron samples were surface nitrided by irradiating them with pulses of an excimer laser in a nitrogen atmosphere. The resulting nitrogen depth profiles measured by Resonant Nuclear Reaction Analysis (RNRA) and the phase formation determined by Conversion Electron Mössbauer Spectroscopy (CEMS) were investigated as functions of energy density and the number of pulses. The nitrogen content of the samples was found to be independent of the number of pulses in a layer of 50 nm from the surface and to increase in depths exceeding 150 nm. The phase composition did not change with the number of pulses. The nitrogen content can be related to an enhanced nitrogen solubility based on high temperatures and high pressures due to the laser-induced plasma above the sample. With increasing pulse energy density, the phase composition changes towards phases with higher nitrogen contents. Nitrogen diffusion seems to be the limiting factor for the nitriding process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538202
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Two-quasiparticle bands in72Br (1988)
    Springer
    The European physical journal 329 (1988), S. 51-61 
    Details
    ISSN: 1434-601X
    Keywords: 27.50.+e ; 23.20.Ck ; 21.60.Ev
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High spin states in the doubly odd nucleus72Br were investigated via the reaction58Ni(16O,pn) at 52–65 MeV beam energy. A multi-element detector system consisting of ten Compton supressed Ge detectors (OSIRIS) and two NE213 neutron detectors was used to establish the yrast bands up to 5 MeV excitation energy and probable spins of 15+ resp. 14−. The lifetimes of 12 states and lifetime limits of four states were measured with the recoil distance method, among them four 0.5–3.1 ns isomers. Doppler broadened line shapes obtained in an additionalγγ-coincidence experiment via the reaction40Ca(36Ar, 3pn) at 125 MeV revealed further lifetimes and (very short) side feeding times. Three rotational bands were established with deformation parameters ¦β 2¦≈0.3 and moment of inertia parameters $$\tilde f$$ /ħ 2=36 MeV−1 (K ρ=1−) resp. 23 MeV−1; their quasi-particle configurations are being discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294815
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    Paper (German National Licenses)
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  • 4
    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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  • 5
    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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