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  • 1980-1984  (14)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    The electric field gradient and its temperature dependence for ruthenium in scandium and yttrium (1980)
    Springer
    The European physical journal 37 (1980), S. 221-224 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electric field gradients (EFG) for ruthenium in scandium and yttrium metal were determined by TDPAC measurements to be 19(4) × 1017 V/cm2 and 5.5(12) × 1017 V/cm2 respectively at room temperature. The EFG for Ru in Sc was found to vary considerably in the temperature range from 14 to 700 K, whereas for Ru in Y only an extremely small temperature dependence of the EFG was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01323035
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  • 2
    Electronic Resource
    Electronic Resource
    Gyromagnetic ratios of the 3/2+ core vibration states of101Ru and95Mo (1984)
    Springer
    The European physical journal 317 (1984), S. 107-115 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theg-factors of the first excited 3/2+ states of101Ru and95Mo have been measured by observing the rotation ofγ-γ directional correlations in the decays of 3.3y 101Rh and 61d 95m Tc in external magnetic fields of about 9.5T provided by our split coil superconducting magnet. The results: $$g_{{\raise0.5ex\hbox{$\scriptstyle 3$}\kern-0.1em/\kern-0.15em\lower0.25ex\hbox{$\scriptstyle 2$}}^ + } ({}^{101}Ru,127 keV) = - 0.157(8)$$ and $$g_{{\raise0.5ex\hbox{$\scriptstyle 3$}\kern-0.1em/\kern-0.15em\lower0.25ex\hbox{$\scriptstyle 2$}}^ + } ({}^{95}Mo,204 keV) = - 0.269(8)$$ are by far more accurate than previous investigations some of which had given quite different results. Bothg-factors are quite well explained by the de Shalit model in its most simple version. A measurement of the half-life of the 127 keV state of101Ru by delayed coincidences with CsF-detectors gave $$T_{{\raise0.5ex\hbox{$\scriptstyle 1$}\kern-0.1em/\kern-0.15em\lower0.25ex\hbox{$\scriptstyle 2$}}} ({}^{101}Ru,127 keV) = - 0.66(1) ns$$ in disagreement with most previous measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01420454
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  • 3
    Electronic Resource
    Electronic Resource
    Gyromagnetic ratios of the 4+ and 6+ rotational states of184W (1982)
    Springer
    The European physical journal 305 (1982), S. 157-166 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The nuclear Larmor precession has been observed for the 2+, 4+ and 6+ rotational states of184W in the hyperfine field of WFe by application of the TDPAC and the IPAC techniques. A carrier free radioactive source of184m Re alloyed with high purity iron was used for all three measurements. From the Larmor precession observed in the 2+ state by TDPACω L = 944(15) MHz and the knowng-factor the hyperfine fieldB 300 K hf (WFe)=−69.6(27)T was derived. The deviation from the result of a spin echo experiment with183WFe extrapolated to room temperature may be caused by the Bohr-Weisskopf effect (hyperfine anomaly). IPAC measurements with the same sample polarized in an external magnetic field of 1.6T gave for the 4+ and 6+ rotational states: ω L τ(4+)=0.0609(22) andω L τ(6+)=0.00735(102). By use of experimentalB(E2)-values theg R -factors were derived asg R (4+)=+0.276(26) andg R (6+)=+0.281(45). The directional correlation of the 537−384 keVγ-γ cascade has been analysed in terms of anE1/M2/E3 mixture for theK-forbidden 537keV transition. We obtained the mixing ratiosδ(M2/E1)=±0.086(16),δ(E3/E1)=−0.028(5) with the sign convention of Krane and Steffen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415023
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  • 4
    Electronic Resource
    Electronic Resource
    Gyromagnetic ratio of the 2+ rotational state of184W and observation of a large hyperfine anomaly with respect to183Wg in iron (1984)
    Springer
    The European physical journal 316 (1984), S. 87-96 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theg-factor of the 2+ rotational state of184W was redetermined by an IPAC measurement in an external magnetic field of 9.45 (5)T as: $$g_{2^ + } (^{184} W) = + 0.289(7).$$ In the evaluation the remeasured half-life of the 2+ state: $$T_{{1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2}} (2^ + ) = 1.251(12)ns$$ was used. TDPAC-measurements with a sample of carrierfree184Re in high purity iron gave the hyperfine fields: $$B_{300 K}^{hf} (^{184} W_2 + \underline {Fe} ) = 70.1(21)T$$ and $$B_{40 K}^{hf} (^{184} W_{2^ + } \underline {Fe} ) = 71.8(22)T.$$ A comparison with the hyperfine field known from a spin echo experiment with183W g Fe leads to the hyperfine anomaly: $$^{184} W_{2^ + } \Delta ^{183} W_g = + 0.145(36).$$ The hyperfine splitting observed in a Mössbauer source experiment with another sample of carrierfree184m Re in high purity iron indicates that the smaller splitting, measured previously by a Mössbauer absorber experiment is due to the high tungsten concentration in the absorber. The new value for theg-factor of the 2+ state together with the result of the Mössbauer experiment allow an improved calibration for our recent investigation of theg R -factors of the 4+ and 6+ rotational states. The recalculated values are: $$g_{4^ + } (^{184} W) = + 0.293(23)$$ and $$g_{6^ + } (^{184} W) = + 0.299(43).$$ The remeasured 792-111 keVγ-γ angular correlation $$W(\Theta ) = 1 - 0.034(4) \cdot P_2 + 0.325(6) \cdot P_4 $$ gives for the mixing ratio of theK-forbidden 792keV transition: $$\delta ({{E2} \mathord{\left/ {\vphantom {{E2} {M1}}} \right. \kern-\nulldelimiterspace} {M1}}) = - \left( {17.6\begin{array}{*{20}c} { + 1.8} \\ { - 1.5} \\ \end{array} } \right).$$ A detailed investigation of the attenuation ofγ-γ angular correlations in liquid sources of184Re and184m Re revealed the reason for erroneous results of early measurements of the 2+ g R -factor: The time dependence of the perturbation is not of a simple exponential type. It contains an unresolved strong fast component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415665
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  • 5
    Electronic Resource
    Electronic Resource
    Orientation of stage III defects trapped at111in in tungsten (1981)
    Springer
    Hyperfine interactions 10 (1981), S. 709-712 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01021997
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  • 6
    Electronic Resource
    Electronic Resource
    Quadrupole interaction prequencies in metals (1981)
    Springer
    Hyperfine interactions 10 (1981), S. 1243-1272 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01022083
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  • 7
    Electronic Resource
    Electronic Resource
    The electric field gradient and its temperature dependence for indium in beryllium (1983)
    Springer
    Hyperfine interactions 15 (1983), S. 241-244 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electric field gradient (EFG) for117InBe has been determined by a TDPAC measurement to be eqtot=1.83(1) 1017V/cm2 at room temperature. The sources were prepared by ion — implantation of117Cd in a Be single crystal. The EFG was found to decrease considerably with increasing temperature. The results are compared to those of other impurities in Be.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02159747
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  • 8
    Electronic Resource
    Electronic Resource
    Sign of the electric field gradient at111Cd in Zr and Sb (1983)
    Springer
    Hyperfine interactions 15 (1983), S. 237-240 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Β-γ TDPAC technique was applied to111Ag implanted in Zr and Sb metal single crystals in order to determine sign and magnitude of the quadrupole interaction at the site of111Cd in these metals. An analysis of the data taken at 293K yielded ΝQ=+15.4(6) MHz for111Cd in Zr and ΝQ=−107.5(20) MHz for111Cd in Sb. From these values electric field gradients of +7.3(8)×1016 V/cm2 and −5.56(62)×1017 V/cm2 for Cd in Zr and Sb are derived respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02159746
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  • 9
    Electronic Resource
    Electronic Resource
    Observation of a 〈100〉 mixed dumbbell at181HF in tungsten (1983)
    Springer
    Hyperfine interactions 15 (1983), S. 417-420 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TDPAC measurements were carried out in Tungsten foils and single crystals using implanted181Hf as a probe nucleus. After proton irradiation at 25 K the trapping of a defect at the Hf probe was observed, which lead to a quadrupole interaction frequency of νQ=354(5) MHz. The defect could be identified as a W self interstitial forming a 〈100〉 mixed dumbbell with a Hf impurity atom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02159781
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  • 10
    Electronic Resource
    Electronic Resource
    Systematics of electric field gradients in metals (1983)
    Springer
    Hyperfine interactions 15 (1983), S. 189-201 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The intensive study of electric field gradients (EFG) at the site of atomic nuclei in noncubic metals has revealed several systematic trends, e.g. in the relation of the total EFG to the so called lattice EFG as well as in its variation with temperature. Numerous investigations have been carried out in order to test these systematics. The results will be reviewed and compared to the known trends. Progress in theoretical calculations of the EFG in pure and impurity — host systems will be discussed and compared to the latest available experimental data. Recent measurements of the EFG at metal surfaces and new calculations of the EFG at host sites in impure cubic metals may contribute to the understanding of the EFG in metals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02159737
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