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  • 27.50.+e  (12)
  • 21.60.Cs  (6)
  • 61.80.Jh  (2)
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  • 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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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ion beam mixing of Pt marker layers in Al (1996)
    Springer
    Applied physics 63 (1996), S. 31-36 
    Details
    ISSN: 1432-0630
    Keywords: 61.80.Jh ; 68.55.Ln
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01579743
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  • 3
    Electronic Resource
    Electronic Resource
    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
    Keywords: 61.80.Jh ; 71.30.+h ; 79.20.Rf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331443
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  • 4
    Electronic Resource
    Electronic Resource
    High spin states in the transitional nucleus88Mo (1992)
    Springer
    The European physical journal 342 (1992), S. 257-265 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Cs ; 23.20.Lv ; 25.70.Jj ; 27.50.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291507
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  • 5
    Electronic Resource
    Electronic Resource
    GRID lifetime measurements in59, 61, 63Ni following thermal neutron capture (1991)
    Springer
    The European physical journal 338 (1991), S. 397-404 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Cs ; 23.20.Ck ; 25.40.Lw
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The GRID-method has been used to measure the lifetimes of ten excited states in59, 61, 63Ni following thermal neutron capture in Ni targets of natural isotopic composition. Four of the lifetimes have been determined for the first time, the other six lifetimes can be compared with the results of conventional DSA-measurements following charged particle induced reactions. Cascade feeding effects have been included in the analysis. Level energies and electromagnetic properties of negative parity states in59Ni have been compared with the results of shell model calculations in 3p0h and 4p 1h model spaces. Statistical model estimates of the lifetimes as function of excitation energy and spin are also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01295767
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  • 6
    Electronic Resource
    Electronic Resource
    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
    Keywords: 23.20.Js ; 25.40.Lw ; 27.50.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292425
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  • 7
    Electronic Resource
    Electronic Resource
    Rotational and single-particle structures in83Zr (1991)
    Springer
    The European physical journal 338 (1991), S. 139-148 
    Details
    ISSN: 1434-601X
    Keywords: 21.10 R ; 23.20.Ck ; 23.20.−g ; 27.50.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284787
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  • 8
    Electronic Resource
    Electronic Resource
    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
    Keywords: 21.10.HW ; 23.20.-g ; 27.50.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292420
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Lifetime measurements in70Se and72Se (1986)
    Springer
    The European physical journal 325 (1986), S. 45-53 
    Details
    ISSN: 1434-601X
    Keywords: 23.20.Ck ; 27.50.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294241
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  • 10
    Electronic Resource
    Electronic Resource
    Identification of near-spherical multiparticle-hole states in89Tc (1992)
    Springer
    The European physical journal 342 (1992), S. 121-122 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Cs ; 27.50.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294497
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