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  • 21.10.Tg  (2)
  • 27.50. + e  (2)
  • 27.50.+ e  (2)
  • 61.80.Ba  (2)
Source
Material
Years
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    TheN=47 shell model nucleus90Tc (1994)
    Springer
    The European physical journal 349 (1994), S. 105-113 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Tg ; 21.60.Cs ; 23.20.Js ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291167
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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Thermal neutron captureγ-ray spectroscopy of59Ni and61Ni (1993)
    Springer
    The European physical journal 345 (1993), S. 143-153 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Ma ; 23.20.Lv ; 25.40.Lw ; 27.50.+ e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01293337
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  • 5
    Electronic Resource
    Electronic Resource
    Double neutron capture in62Ni (1992)
    Springer
    The European physical journal 343 (1992), S. 7-14 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Ma ; 23.20.Lv ; 25.40.Lw ; 27.50. + e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291590
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  • 6
    Electronic Resource
    Electronic Resource
    Heavy-ion in-beam studies of the nucleus87Nb (1991)
    Springer
    The European physical journal 340 (1991), S. 125-139 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.R ; 23.20.ck ; 27.50. + e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01303824
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  • 7
    Electronic Resource
    Electronic Resource
    Structure of high spin states in83Y (1988)
    Springer
    The European physical journal 329 (1988), S. 413-427 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.HW ; 23.20.−g ; 27.50.+ e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on the first in-beam study of high spin levels in83Y which were established up to 9.0 MeV excitation energy and probable spin of 41/2+ resp. 27/2− by means of the reaction58Ni(28Si, 3p). Ten lifetimes and six lifetime limits in the 10−12–10−9 s range were determined in two recoil distance Doppler shift experiments. The positive parity yrast states form ag 9/2 Coriolis decoupled band with partial alignment, near-rigid rotor moment of inertia and deformationβ 2=0.29. The negative parity yrast band has very similar collective properties; it shows a pronounced band crossing at rotational frequency ħω≈0.40 MeV which we associate with twoquasiparticleg 9/2 proton alignment. At 2.56 MeV excitation, a second ΔI=1 band starting with 17/2− was found. On the basis of the similarity to85Y and the very weakE2 decay of this state, we suggest that this band has (3qp) configuration with an alignedg 9/2 neutron pair. The lifetimes of the lowest 2+ and 4+ state in84Zr populated in the reaction58Ni (28Si, 2p) were determined to be τ(2)=17.8(11) ps resp. τ(4)=3.5(4) ps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294346
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  • 8
    Electronic Resource
    Electronic Resource
    Electromagnetic decay strengths in the isobars89Nb,89Mo and89Tc (1995)
    Springer
    The European physical journal 352 (1995), S. 365-372 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Tg ; 21.60.Cs ; 27.50.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01299754
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    Paper (German National Licenses)
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