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  • 21.10.Tg  (2)
  • 27.50. + e  (2)
  • 61.80.Ba  (2)
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Materialart
Erscheinungszeitraum
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    TheN=47 shell model nucleus90Tc (1994)
    Springer
    The European physical journal 349 (1994), S. 105-113 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Tg ; 21.60.Cs ; 23.20.Js ; 27.60.+j
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Lifetimes of high spin states in the nucleus90Tc have been measured via the fusion evaporation reactions58Ni(36Ar,3pn)90Tc at 140 MeV and58Ni(35Cl,2pn)90Tc at 120 MeV beam energy. The OSIRIS spectrometer as well as a new neutron-γ-coincidence setup were used to measure lifetimes in the 10−12-10−9 s range by the recoil distance Doppler-shift method. By means ofγ-multiplicity and neutron-gated spectra fifteen lifetimes wered-educed. The experimental branching ratios and transition probabilities are compared to predictions of shell model calculations in a restricted π(p1/2), π(g9/2), ν(p1/2), and ν(g9/2) configuration space. In most cases the agreement with the calculations using the Gross-Frenkel parameters is striking but the results for several yrare states very sensitively depend on the residual interaction used.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01291167
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 61.80.Ba ; 52.75.-d ; 81.60.Bn
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01575086
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  • 3
    Digitale Medien
    Digitale Medien
    Laser nitriding of iron: Nitrogen profiles and phases (1995)
    Springer
    Applied physics 61 (1995), S. 1-5 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 61.80.Ba ; 52.75.-d ; 81.60.Bn ; 76.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01538202
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  • 4
    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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  • 5
    Digitale Medien
    Digitale Medien
    Heavy-ion in-beam studies of the nucleus87Nb (1991)
    Springer
    The European physical journal 340 (1991), S. 125-139 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.R ; 23.20.ck ; 27.50. + e
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract High spin states in the transitional nucleus87Nb up to 14 MeV excitation have been established for the first time via the reactions40Ca(50Cr, 3p)87Nb and58Ni (32S, 3p)87Nb. The87Nbγ-radiations have been identified throughγ-ray spectra taken in coincidence with the evaporation residues detected in the Daresbury recoil separator or with multiple proton emission. Gamma-gamma coincidences, DCO ratios,γ-ray angular distributions and lifetimes have been measured. A total of some 100 transitions have been placed into a level scheme comprising of sixty states. The one-quasiparticle (1qp) bands of either parity and several other band-like structures have been identified, some containing alignedg 9/2 nucleons. Moderately enhancedE2 in-band transitions of 13–48 W.u. as well as several weakE2 yrast transitions connecting bands with different quasiparticle numbers have been found. Similarities with respect to theN=46 isotones83Rb,84Sr,85Y,86Zr and88Mo are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01303824
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  • 6
    Digitale Medien
    Digitale Medien
    Electromagnetic decay strengths in the isobars89Nb,89Mo and89Tc (1995)
    Springer
    The European physical journal 352 (1995), S. 365-372 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Tg ; 21.60.Cs ; 27.50.+e
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Lifetimes of high spin states in the threeA=89 isobars89Nb,89Mo and89Tc have been measured via the Recoil Distance Doppler Shift technique and the fusion evaporation reactions58Ni(35Cl,xnypzα) at 120 MeV beam energy. Reduced transition probabilities for about 50γ transitions were extracted. The experimental branching ratios in89Mo and reduced transition probabilities in all three isobars are compared with the predictions of the spherical shell model based on the restrictedπ(p 1/2),π(g 9/2), ν(p1/2),ν(g 9/2) configuration space with two different types of residual interaction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01299754
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