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  • 1985-1989  (12)
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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic moment of the 5/2−1/2[541] ground state of 14h 185Ir (1986)
    Springer
    The European physical journal 323 (1986), S. 185-187 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Ky ; 27.80.+q ; 76.80.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetic and electric hyperfine splitting frequencies ¦gμ N B HF/h¦ ande 2 qQ/h of the 5/2−1/2[541] ground state of 14h 185Ir in Ni were measured with nuclear magnetic resonance on oriented nuclei to be 360.8(7) MHz and +6.7(2.0) MHz, respectively. The ground state magnetic dipole moment and electric quadrupole moment of185Ir are deduced to be ¦μ¦=2.601 (14)μ N andQ=−1.9(5)b, taking values for the hyperfine field and electric field gradient of BHF=−454.9 (2.3) kG and eq=−0.151(4) × 1017 V/cm2, respectively. The negative quadrupole moment is in agreement with nuclear-orientation data and proves again theI π K=5/2− 1/2 ground state configuration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290310
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  • 2
    Electronic Resource
    Electronic Resource
    Confirmation of the giant hyperfine anomaly of the system184W2+-183W g by new spin-echo experiments with183WFe and remarks on possible explanations (1985)
    Springer
    The European physical journal 322 (1985), S. 75-82 
    Details
    ISSN: 1434-601X
    Keywords: 21.10 ; 27.70+ ; 33.25
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Spin-echo measurements on183W were performed with dilute alloys of W (0.1, 0.25, 0.5 and 1 at %) in Fe. The result for the hyperfine field:B 4.2K hf =(−)62 · 54 (3) T agrees with the old data of Kontani and Itoh, but the accuracy is much better. The giant hyperfine anomaly of183W with respect to184W2+ observed by Alzner et al. is thus confirmed and the errors are reduced to:184W2+Δ183Wg=+0.150(31). This is the first case of a very large hyperfine anomaly in electronic hyperfine fields which is not caused by the pathological cancellation of orbital and spin magnetism in jackknifep 1/2 ord 3/2 single proton configurations. A detailed discussion shows that the large hyperfine anomaly may be related to the anomalously small magnetic dipole moment of183W. Our result should stimulate further theoretical work with the aim to understand this magnetic moment as well as the giant hyperfine anomaly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412019
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  • 3
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance on oriented 11/2− 129mXe and131mXe in Fe (1987)
    Springer
    The European physical journal 326 (1987), S. 255-259 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Ky ; 27.60.+ j ; 76.60.−k ; 76.80.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetic hyperfine splitting frequenciesν M=¦gμ NBHF/h.¦ of the 11/2− isomeric states129m Xe (T1/2=8.9d) and131mXe (T1/2=11.8d) in Fe were measured with nuclear magnetic resonance on oriented nuclei at temperatures of 10–15 mK as 188.0(1) MHz and 209.8(1) MHz, respectively, the samples being prepared with the technique of recoil implantation after (α, x n) reactions. The magnetic moments of129m Xe and131m Xe are deduced to be (−)0.8914(6)μ N and (−)0.9943(6)μ N, respectively. The missing γ-anisotropies for allγ-transitions following the decay of 36.4d 127Xe indicateI=1/2 for the ground state spin of127Xe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01297578
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  • 4
    Electronic Resource
    Electronic Resource
    Detection on NMR via the anisotropy of X-rays (X-NMR-ON) (1985)
    Springer
    Hyperfine interactions 22 (1985), S. 163-166 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Nuclear magnetic resonance on oriented nuclei has been detected for the first time via the destruction of the anisotropy of characteristic Lx-rays. The new method can be applied to isomeric states which decay only via highly converted transitions, for which the standard NMR-ON technique — detection of NMR via the anisotropy of γ-rays — is not applicable. The X-NMR-ON technique has been used to measure the magnetic hyperfine splitting of193mpt (Iπ=1322+; E=149.8 keV; T1/2= 4.3 d) to be ¦ gμ NBHF/h¦=111.3 (3) MHz. with the known hyperfine field of −1280(27) kG the magnetic moment of193mpt is deduced to be ¦μ¦=0.7417(14) μN. This magnetic moment differs strongly from the known magnetic moments of the 13/2+ isomeric states in Hg and Pb and195mPt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02063987
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  • 5
    Electronic Resource
    Electronic Resource
    Search for hyperfine anomaly and quadrupole interaction of Os in Fe (1989)
    Springer
    Hyperfine interactions 51 (1989), S. 915-915 
    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/BF02407801
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  • 6
    Electronic Resource
    Electronic Resource
    Electric quadrupole moments of radioactive Pt isotopes (1985)
    Springer
    Hyperfine interactions 22 (1985), S. 47-53 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Nuclear orientation experiments were performed on189Pt (Iπ=3/2−; T1/2=11 h),191pt (Iπ=3/2−; T1/2=2.8 d) and195mptπ=3/2−; T1/2=4.0 d) in an Os single crystal at temperatures down to 10 mK. Preliminary results for the quadrupole splitting νo=e2qQ/h are +48 (9), +39 (6), and −87 (12) MHz for189ptOs,191ptOs, and195mptOs, respectively. Preliminary results for the quadrupole moments are −0.8 (4), −0.6 (3), and +1.4 (7) b for189pt,191pt, and195mpt, respectively. In addition, the quadrupole subresonance structure of189pt and191pt in Fe was measured with quadrupole-interaction resolved NMR-ON spectroscopy. The results for the magnetic hyperfine splitting νM=¦gμNBHF/h¦ and νQ are:189ptFe: νM=277.9 (1) MHz; νQ=+1.39 (5) MHz.191ptFe: νM=320.17 (3) MHZ; νQ=+1.39 (3) MHz. The ratio of the quadrupole moments of191pt and189pt is deduced to be Q (191Pt/Ql89pt)=+1.00 (4). The negative quadrupole moments of189pt and191pt indicate a predominantly oblate shape of the ground states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02063978
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  • 7
    Electronic Resource
    Electronic Resource
    Nuclear magnetic moment of 12 d 11/2− 131mXe (1985)
    Springer
    Hyperfine interactions 22 (1985), S. 573-577 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract NMR-ON measurements were performed on131mXe (Iπ=11/2−; T1/2=12.0 d) in Fe, the sample being prepared by recoil implantation after the130Te(α,3n)131mXe compound reaction at Eα=40 Mev. The hyperfine splitting μNBHF/h¦, extrapolated to zero external magnetic field, was found to be 209.9(1) MHz. Taking BHF=+1523(8) kG for the hyperfine field of XeFe, the magnetic moment of131mXe is deduced to be (−)0.994(5) μN. As a byproduct, the zero-field hyperfine splitting of129mXe (Iπ=11/2−; T1/2=8.9d) in Fe was measured as 188.1(1) MHz, with which a magnetic moment of (−)0.891(5) μN is deduced for129mXe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064025
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  • 8
    Electronic Resource
    Electronic Resource
    Nuclear orientation at isolde/cern (1988)
    Springer
    Hyperfine interactions 43 (1988), S. 139-149 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A facility for Nuclear Implantation into Cold On-Line Equipment (NICOLE) is being installed at the new on-line isotope separator ISOLDE 3 at CERN. The first on-line run was in the beginning of July 1988. The low temperature equipment has been successfully tested and first off-line experiments on various isotopes have been performed. NMR/ON has been done on vaious isotopes (Co, Xe, Pt, Au) in iron host. First experience with the top-loading dilution refrigertor (Oxford Instruments Limited) shows that it performs very well. The cooling power is 400 μW at 100 mK and 34 μW at 25 mK. The base temperature can be kept continuously well below 5 mK. NMR/ON can be performed at temperatures below 5.5 mK. The base temperature on-line is expected to be lower then 6 mK. The sample can be cooled down from room temperature to 10 mK within two hours, to 6 mK within 3 hours which is not only important for off-line but also for on-line experiments when samples have to be changed to remove long lived daughter activity. The latest results will be reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02398294
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  • 9
    Electronic Resource
    Electronic Resource
    Nuclear orientation and quadrupole interaction (1985)
    Springer
    Hyperfine interactions 22 (1985), S. 19-38 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In quadrupole-interaction nuclear-orientation experiments (QI-NO) the quadrupole interaction frequency VQ=e2qQ/h is determined from the angular distribution of γ-rays emitted in the decay of radioactive nuclei oriented at low temperatures as impurities in noncubic single-crystal matrices. This means that either the spectroscopic quadrupole moment Q of radioactive isotopes or the crystal electric field gradient eq can be determined from QI-NO experiments. Recent developments in QI-NO are discussed, especially with regard to the investigation of nuclei far from stability, with the following main topics: (1) Experimental aspects; (2) Quadrupole moments of short-lived nuclei; (3) Systematics of electric field gradients; (4) QI-NO with “new” host lattices, such as dichalcogenides; (5) Resonance techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02063976
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  • 10
    Electronic Resource
    Electronic Resource
    Dynamics of hydrogen in Ta in the mK-region (1987)
    Springer
    Hyperfine interactions 35 (1987), S. 773-777 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The low-temperature diffusion of hydrogen and deuterium in Ta was investigated using the method of perturbed angular correlation. In an ealier paper we reported the results of measurements above 4 K. These experiments have now been extended down to 10 mK. We found that the configuration of trapped hydrogen and deuterium changes, if the sample is cooled from 4.2 K to 10 mK. We suggest that this change is due to a transition of an extended to a more localized wave function of H (D).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02394492
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