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  • 1
    Digitale Medien
    Digitale Medien
    Magnetic dipole moments of excited states of105Pd and other spectroscopic investigations in the decay of105g Ag (1981)
    Springer
    The European physical journal 302 (1981), S. 223-232 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The IPAC-method has been used with the external magnetic field of 9.0 T of a split coil superconducting magnet and with the internal field of PdFe for a measurement of magnetic moments of105Pd states populated in the decay of 41.29d105Ag. The results are:μ 7/2 (645 keV)=−1.49(9) nmμ 5/2 (319 keV)=+0.95(20) nmμ 3/2 (280keV)=−0.074(13) nm. The half-life of the 645 keV state has been redetermined by use of cooled thallium free Nal detectors asT 1/2 (645 keV)=126(2) ps. γ-γ directional correlations were measured with a system of three large Ge planar diodes for the cascades 443–645 keV, 332–319 keV, 393–280 keV, and 64–280 keV and analyzed in terms of dipole quadrupole mixing ratios of theγ-lines involved. The spin of the 673 keV state was derived as l/2+.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01415542
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01415665
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01415023
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  • 4
    Digitale Medien
    Digitale Medien
    Gyromagnetic ratios of 4+ and 6+ states in156Gd and158Gd (1988)
    Springer
    The European physical journal 331 (1988), S. 277-286 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.20 ; 27.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The followingg-factors have been derived from time integral measurements of γ-γ angular correlations in the static magnetic hyperfine field of magnetized gadolinium metal probes:156Gd:g(4 1 + )=+0.310(19)g(6 1 + )=+0.25(21)g(4 3 + , 1511 keV)=+0.809(27)158Gd:g(4 1 + )=+0.409(15). The 5.35d 156Tb sources were produced by the reaction156Gd(d, 2n)156Tb in our cyclotron. A carrier-free 150y 158Tb source was obtained from ISOLDE/CERN. In comparison with the precisely knowng-factors of the 2 1 + states,g(2 1 su+ ,156Gd) =+0.386(4) andg(2 1 + ,158Gd)=0.381(4), we observe a large reduction for the156Gd 4 1 + state whereasg increases slightly for158Gd. The half-life of the 4 1 + state of158Gd was remeasured as158Gd:T 1/2(4 1 + )=148(2) ps. A measurement of the rotation in the 4 3 + state of156Gd in external magnetic fields of various strengths up toB ext=9.5 T did not confirm the anomalous dependence of the magnetic hyperfine field in gadolinium metal on the external field, which has been reported by Persson et al. [29].
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01355597
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  • 5
    Digitale Medien
    Digitale Medien
    Gyromagnetic ratios of collective states of166Er (1985)
    Springer
    The European physical journal 322 (1985), S. 467-478 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.20 ; 27.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The static hyperfine field ofB hf 4.2k (ErHo) = 739(18)T of a ferromagnetic holmium single crystal polarized in an external magnetic field of ± 0.48T at ∼4.2K was used for integral perturbed γ-γ angular correlation (IPAQ measurements of the g-factors of collective states of166Er. The 1,200y 166m Ho activity was used which populates the ground state band and the γ vibrational band up to high spins. The results: $$\begin{gathered} g(4_g^ + ) = + 0.315(16) \hfill \\ g(6_g^ + ) = + 0.258(11) \hfill \\ g(8_g^ + ) = + 0.262(47)and \hfill \\ g(6_\gamma ^ + ) = + 0.254(32) \hfill \\ \end{gathered}$$ exhibit a significant reduction of the g-factors with increasing rotational angular momentum. The followingE2/M1 mixing ratios of interband transitions were derived from the angular correlation coefficients: $$\begin{gathered} 5_\gamma ^ + \Rightarrow 4_g^ + :\delta (810keV) = - (36_{ - 7}^{ + 11} ) \hfill \\ 7_\gamma ^ + \Rightarrow 6_g^ + :\delta (831keV) = - (18_{ - 2}^{ + 3} )and \hfill \\ 7_\gamma ^ + \Rightarrow 8_g^ + :\delta (465keV) = - (63_{ - 12}^{ + 19} ). \hfill \\ \end{gathered}$$ The results are discussed and compared with theoretical predictions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01412082
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  • 6
    Digitale Medien
    Digitale Medien
    The gyromagnetic ratio of the 589 keV 3/2− state of117In (1985)
    Springer
    The European physical journal 320 (1985), S. 425-431 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Theg-factor of the 589 keV state of117In has been determined by a measurement of the rotation of the 1,303–273 keVγ —γ directional correlation in an external magnetic field of 9.55(1) T. The result,g 3/2(589 keV)=+0.068(39), contradicts the usual interpretation of the state as the 2p 3/2 single proton hole configuration for which the Schmidt value isg 3/2-(Schmidt)=+2.53. It favours the interpretation as the first rotational state built up on the single proton [301] 1/2− Nilsson orbit in a strongly deformed core of prolate shape.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01415719
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  • 7
    Digitale Medien
    Digitale Medien
    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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01420454
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