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  • Digitale Medien  (16)
  • 27.50.+e  (12)
  • 21.60.Ev  (3)
  • 27.40.+ z  (2)
  • 52.75.-d  (2)
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  • Digitale Medien  (16)
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  • 1
    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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  • 2
    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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  • 3
    Digitale Medien
    Digitale Medien
    High spin states in the transitional nucleus88Mo (1992)
    Springer
    The European physical journal 342 (1992), S. 257-265 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.60.Cs ; 23.20.Lv ; 25.70.Jj ; 27.50.+e
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The reaction58Ni(36Ar,α qρ)88Mo has been studied at 145 MeV beam energy. A detector array consisting of the OSIRIS spectrometer, four charged-particleΔE detectors and seven NE213 neutron detectors has been used to meaure the gamma radiation inγγ- and particle-γγ-coincidence mode. The level scheme of88Mo has been extended up to 11.6 MeV excitation energy and probable spin 23ħ; some 70 transitions and 40 levels have been identified. Spin assignments have been proposed on the basis of measured DCO ratios. Hartree Fock cranking calculations of the Total Routhians and shell model calculations of the high spin states are presented which imply near-sphericity of the yrast line up to the highest spins found. A classification of the high spin states according to their leading seniority is proposed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01291507
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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
    Transitions in41K studied with the (n, n′γ) reaction (1987)
    Springer
    The European physical journal 326 (1987), S. 327-332 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 27.40.+ z ; 28.20.Cz
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Singles gamma ray spectra of the41K(n, n′γ)41K reaction have been measured with fast reactor neutrons. The populated states and γ-ray intensities are compared with those of the40K(n, γ)41K reaction. About 91% of the observed gamma ray intensity was assigned to the decay of 35 states in41K. The energy and spin dependence of the gamma ray fluxes in both reactions are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01297587
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  • 6
    Digitale Medien
    Digitale Medien
    Strength functions of primary transitions following thermal neutron capture in strontium (1989)
    Springer
    The European physical journal 332 (1989), S. 397-405 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.20.Js ; 25.40.Lw ; 27.50.+e
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The primaryE1,M1 andE2γ-radiation in87,88,89Sr observed after thermal neutron capture was compared with the predictions of single particle and giant resonance models. The nuclei feature a wide range of neutron binding energies between 6.3 and 11.1 MeV, which makes a 5.5 MeV spectrum of primary transition energies available for investigation. The (n, γ) reaction was used to estimate the parameters of the spin-flip M1 giant resonance in strontium. The total energy weightedM1 strength of this resonance exceeds the results of shell model and random phase approximation calculations for90Zr by a factor of 3–4. TheE1 strengths were found to agree with the established giant dipole resonance model. The few data on primaryE2 transitions do not allow to differentiate between the giant quadrupole resonance and the single particle models.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01292425
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  • 7
    Digitale Medien
    Digitale Medien
    Rotational and single-particle structures in83Zr (1991)
    Springer
    The European physical journal 338 (1991), S. 139-148 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10 R ; 23.20.Ck ; 23.20.−g ; 27.50.+e
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The band structure of83Zr has been investigated using the Daresbury recoil separator and TESSA array with 20 Compton suppressed Ge detectors and the reaction28Si (58Ni, 2pn) at 195 MeV. DCO ratios have been used to make many new spin assignments. The three known rotational bands have been extended up to the onset of the five quasiparticle bands. On the basis of the 21/2+, 23/2+ and 25/2+ yrast and yrare states, a (3qp) structure similar to those found in the isotones79Kr and81Sr has been identified. Additional bands have been observed for the first time, one of which appears to be non-collective. Strong mixing between the various negative parity bands is evident. A multiplet of states feeding the three quasiparticle region of the negative parity yrast band has been found. The data is interpreted in the framework of the cranked shell model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01284787
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  • 8
    Digitale Medien
    Digitale Medien
    On the coexistence of oblate and prolate deformed bands in83Zr (1989)
    Springer
    The European physical journal 332 (1989), S. 363-370 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.HW ; 23.20.-g ; 27.50.+e
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Deformation parameters of the positive parity yrast band and negative parity bands in83Zr are deduced from lifetimes andE2/M1 mixing ratios. Lifetimes of high spin states have been determined from recoil distance Doppler shift and Doppler shift attenuation measurements using the54Fe(32S,2pnγ) 83Zr reaction. Ten lifetimes and five lifetimes limits were determined. The positive parity band, built on theg 9/2 K=5/2 orbital has an average deformation ¦β 2¦=0.28(2), and shows a reduction ofE2 transition strengths in the observed backbend region at Iπ≈21/2+. In contrast, theE2 strengths in the negative parity states show a steady increase up to Iπ≈=15/2−. These states are more strongly deformed than the positive parity states (¦β 2¦=0.33(3)). TheE2/M1 mixing ratios show that the negative parity band hasK=3/2 and is prolate, and favour oblate deformation for the positive parity yrast band. In theK=1/2− band theE2 strength of the 7/2−→3/2− transition yields a deformation ¦β 2¦=0.26(5). The band structure is compared with calculations within the Hartree-Fock Bogoliubov cranking model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01292420
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  • 9
    Digitale Medien
    Digitale Medien
    Lifetime measurements in70Se and72Se (1986)
    Springer
    The European physical journal 325 (1986), S. 45-53 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.20.Ck ; 27.50.+e
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Mean lives and limits of lifetimes have been determined for some ten mostly yrast states in70Se, by means of the recoil distance Doppler shift technique. The states were excited in the reaction40Ca(36Ar,α2p) at 115 MeV resp. the reaction58Ni(14N,pn) at 39 MeV beam energy. The systematic decrease ofB(E2) values along the the ground band transitions indicates a band crossing consistent with theγ-ray energies. Effects of continuum feeding times in both reactions are being discussed. The lifetimes of the lowest three yrast transitions in72Se have been remeasured by means of the reactions40Ca(36Ar,4p) and60Ni(14N,pn).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294241
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  • 10
    Digitale Medien
    Digitale Medien
    Identification of near-spherical multiparticle-hole states in89Tc (1992)
    Springer
    The European physical journal 342 (1992), S. 121-122 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.60.Cs ; 27.50.+e
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Excited states in the nucleus89Tc have been identified for the first time by measuring evaporated particle-γγ-coincidences via the fusion reaction58Ni +36Ar at 149 MeV. Nine γ-ray transitions built upon the (9/2+) ground state have been found, reaching up to a probable spin of (33/2+) at 5.3MeV excitation energy. The levels are interpreted with the shell model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294497
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