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  • 1
    Electronic Resource
    Electronic Resource
    Negative muon hyperfine transition rate in aluminum (1984)
    Springer
    Hyperfine interactions 19 (1984), S. 879-883 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The residual polarization of theF − hyperfine state ofμ −27Al has been investigated as a function of applied transverse magnetic field strength using standard TD-μ −SR techniques. TheF − precession frequency is −0.2623(5) [theoretical value: −0.2622] times that of the free muon in the same field. The observed muon decay electron asymmetry in theF − state decreases with increasing magnetic field strength, due to initial precession in the opposite direction of theF + state, which most muon initially populate, followed by a rapid transition to theF − state. A fit of the data to this model indicates a transition rateR=41(9)μs−1, in good agreement with theoretical predictions. This method can be used to determineR experimentally in other cases where it is too fast to be observed directly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02066133
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  • 2
    Electronic Resource
    Electronic Resource
    Acknowledgements (1994)
    Springer
    Hyperfine interactions 86 (1994), S. X 
    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/BF02068984
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  • 3
    Electronic Resource
    Electronic Resource
    Muonium formation via charge transport in solids and liquids (1997)
    Springer
    Hyperfine interactions 105 (1997), S. 189-201 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We review our recent experimental studies on delayed muonium formation in insulators and semiconductors. This involves the positive muon capturing one of the excess electrons liberated in its own ionization track and competes with recombination or escape of the electrons. The muon is generally found to thermalise well “downstream” from the center of the electron distribution, so that the transport mechanism of the electrons is a crucial factor. This is discussed in terms of the different tendencies to localization (as polarons in solids or in bubbles in liquids) vs. band‐like propagation. Studies of Van der Waals cryocrystals and cryoliquids are reviewed and some preliminary results reported for sapphire and silicon. Transport distances and times are determined from the variation of μSR signal amplitudes with applied electric and magnetic fields, respectively, enabling the development of a new technique for measuring electron mobilities on a microscopic scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012643119286
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  • 4
    Electronic Resource
    Electronic Resource
    Negative muon precession in nuclei with spin (1984)
    Springer
    Hyperfine interactions 19 (1984), S. 873-878 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Polarized negative muons were stopped in various materials containing nuclei with nonzero spin. The TF-μSR precession signal of theF + hyperfine state (frequencyv + 〉 0) was pronounced forμ −Li andμ −Be, faint forμ −Cl (in NiCl2), and undetectable forμ −F (in CaF2 or NiF2) andμ −P. TheF − signal (frequencyv − 〈 0) was observed clearly forμ −Be,μ −Al andμ −Na, marginally forμ −K,μ −V andμ −Nb, and not at all forμ −Ga (at 4 kOe) orμ −Co (ferrromagnetic, zero field). In the heavier elements theF − signal is “fed” by transitions from theF + to theF − state at a rateR, as long asR≫(v + −v −). [See separate paper onμ −Al in these Proceedings, p. 879.]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02066132
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  • 5
    Electronic Resource
    Electronic Resource
    Preface (1981)
    Springer
    Hyperfine interactions 8 (1981), S. ix 
    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/BF01037485
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  • 6
    Electronic Resource
    Electronic Resource
    Modified London model for the determination of λ and ζ in a high κ superconductor (1994)
    Springer
    Hyperfine interactions 86 (1994), S. 597-602 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a modified London model suggested by Brandt [1–3] which introduces a finite vortex core size appropriate for isotropic superconductors in which the average internal field is less than approximately (1/4)H c2. TheμSR lineshape resulting from this model possesses a distinctive shape due to the magnetic penetration depth λ and the vortex core diameter (approximately equal to twice the coherence length ζ). However, for a given lineshape, there is a large range of values of λ and ζ which produce nearly the same lineshape. Lineshape smearing caused by disorder in the vortex lattice increases uncertainty in values for λ and ζ. If well-determined values of either λ(T) or ζ(T) are not available from another technique, both of them can be determined byμSR measurements alone if runs in more than one applied field at the same temperature are fit with λ and ζ as shared parameters. We also present our method of estimating the degree of disorder in the vortex lattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068953
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  • 7
    Electronic Resource
    Electronic Resource
    Corrected asymmetry plots (1994)
    Springer
    Hyperfine interactions 87 (1994), S. 1135-1140 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Presenting experimental data as asymmetry plotsA i (t), rather than as single histogramsN ±i (t), removes the muon lifetime which allows the time dependence of the ensemble muon polarization to be viewed directly (particularly useful for longitudinal and zero field experiments). The combining of two histograms effectively increases the statistical accuracy by a factor of √2. However, differences in efficiency within a pair of counters, differences in solid angle subtended by a pair of counters, counter pairs which are not exactly 180 degrees apart and errors in the random background estimate can distort the calculation of the asymmetry. This paper describes the expected distortions and explains how to correct for them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068516
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  • 8
    Electronic Resource
    Electronic Resource
    Muonium in bulk fused quartz: Test case for RAHD relaxation theory (1986)
    Springer
    Hyperfine interactions 32 (1986), S. 527-533 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Muonium (μ + e −) in bulk fused quartz is a unique system in that theμ + spin polarization (in the muonium state) relaxes almost entirely via random anisotropic hyperfine distortions (RAHD). As such, this system provides an excellent test case for a new RAHD spin relaxation theory. This theory is quantitatively compared to static zero field data and the functional characteristics in both the high field and dynamic limits are considered as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02394951
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  • 9
    Electronic Resource
    Electronic Resource
    The rotating reference frame transformation in μSR (1991)
    Springer
    Hyperfine interactions 65 (1991), S. 1107-1111 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper discusses the mechanics and benefits of using discrete rotating reference frame transformations in the analysis of μ SR data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397768
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  • 10
    Electronic Resource
    Electronic Resource
    μSR at new accelerators (1991)
    Springer
    Hyperfine interactions 65 (1991), S. 1137-1148 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper I speculate upon the potential of muon spin rotation/relaxation/resonance (μSR) for future refinement and/or exploitation at large accelerators like KAON, which might generate muon beams a hundred times more intense than today's best. Several schemes for efficient utilisation of such beams might be well worth implementing on existing muon channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397772
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