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  • 21
    Electronic Resource
    Electronic Resource
    Tests of the position sensitivity of an improved PASS detector
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 348 (1994), S. 696-699 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0168-9002(94)90827-3
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  • 22
    Electronic Resource
    Electronic Resource
    Multiple spin echoes for protons in water
    Amsterdam : Elsevier
    Journal of Magnetic Resonance (1969) 93 (1991), S. 589-595 
    Details
    ISSN: 0022-2364
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-2364(91)90085-8
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  • 23
    Electronic Resource
    Electronic Resource
    Nuclear spin-lattice relaxation in metals at low temperatures (1988)
    Springer
    Journal of low temperature physics 70 (1988), S. 151-172 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In NMR experiments performed on metals at low temperatures, the analysis to obtain the nuclear spin-lattice relaxation time τ1 can be quite complicated. The electronic heat capacity ultimately becomes less than that of the nuclear spins, and the characteristic times for heat flow through the various resistances between the nuclear spins and the thermal bath can become long relative to τ1. This makes it necessary to solve the full set of coupled differential equations describing the thermal relaxation. This problem has been examined because τ1 is used as a thermometric parameter, and we consider the cases when the radiofrequency field penetrates the sample completely (powders and foils) and when only the skin-depth nuclei are excited (bulk specimens). Using our theoretical model, we analyze experimental results for platinum powder and a thallium bulk sample and obtain consistent values for κ=τ1 T over a wide range of experimental conditions, even when thermal bottlenecks occur and the apparent relaxation time is much longer than τ1. These values are κ(Pt)=(34.2±0.6)×10−3 sec K and κ(Tl)=(4.37±0.08)×10−3 sec K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683249
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  • 24
    Electronic Resource
    Electronic Resource
    Measurements of NMR on oriented ^1^9^2Ir and ^1^9^1Ir^m in Ni and Fe host lattices
    Amsterdam : Elsevier
    Physics Letters B 36 (1971), S. 328-330 
    Details
    ISSN: 0370-2693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0370-2693(71)90716-7
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  • 25
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance on oriented109In(4.2h) and110In(4.9h) after recoil implantation into Fe (1981)
    Springer
    The European physical journal 300 (1981), S. 339-344 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Radioactive109In(j π=9/2+;T 1/2=4.2h) and110In(j π=7+;T 1/2=4.9h) were produced via the109Ag (α, xn) reactions and recoil-implanted into Fe foils. With the technique of nuclear magnetic resonance on oriented nuclei the magnetic hyperfine splittings were investigated in external magnetic fieldsB 0=0.5...4.2 kG. The zero-field splitting were measured as 268.9(2)MHz and 147.3(3)MHz for109InFe and110InFe, respectively. With the known hyperfine fieldB HF(InFe)=−286.6(5) kG the nuclearg-factors are deduced asg(109In)=1.231(3) andg(110In)=0.674(2). Our result for109In shows that theπ g 9/2 g-factors vary by only ∼0.1% betweenA=109 and 115. For the |π 9/2 vd 5/2〉7+ of110In the additivity relation of magnetic moments is fulfilled to on accuracy of 0.3(3)%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419866
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  • 26
    Electronic Resource
    Electronic Resource
    Nuclear orientation study of97, 103, 105Ru in Fe (1981)
    Springer
    The European physical journal 299 (1981), S. 353-358 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Angular distributions have been measured forγ-rays emitted following the decays of97, 103, 105Ru oriented in an iron matrix at temperatures down to 2.8mK. From the temperature dependence of theγ-anisotropies the magnetic hyperfine splitting frequenciesν M =|gμ N B HF/h| of97, 103, 105RuFe were found to be 110(7), 57(15) and 80 −50 +17 MHz, respectively. With the known hyperfine fieldB HF=−489.6(4.0) kG the nuclearg-factors are derived as ∣g(97Ru;j π=5/2+)∣=0.29(2), ∣g(103Ru;j π=3/2+)∣=0.15(4) and ∣g(105Ru;j π=3/2+)∣=0.21 -0.13 +0.05 . The analysis for103RuFe has been performed with the assumption ofj π=3/2+ and 5/2+ for the ground state of103Ru. Taking into account experimentally knowng-factors of 3/2+ and 5/2+ states in this mass region, our data strongly favour the assignmentj π=3/2+ for the103Ru ground state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01441279
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  • 27
    Electronic Resource
    Electronic Resource
    Nuclear orientation of183Re and184Re in iron (1972)
    Springer
    The European physical journal 254 (1972), S. 312-322 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The temperature dependence of the anisotropy of γ-rays from the decay of oriented183,184Re nuclei situated in an iron matrix was measured between 14 and 33 mK. Magnetic hyperfine splitting constants ofgH HF=5.04(9) × 10−18 erg andgH HF=3.21 (13) × 10−18 erg were determined for the groundstates of183Re and184Re, respectively. With the previously known hyperfinefield of −760(15) kG for Re in iron the followingg-factors were deduced:183Reg=1.32 (5) and184Reg=0.84 (5). The E2/M1 mixing ratio of the 793 keV 2+ −2+ transition in184W was accurately determined to δ (793 keV)=+16.65 (85).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390261
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  • 28
    Electronic Resource
    Electronic Resource
    Field and excitation dependent ultrasonic attenuation in3He-B (1995)
    Springer
    Journal of low temperature physics 101 (1995), S. 767-773 
    Details
    ISSN: 1573-7357
    Keywords: 67.50.Fi ; 43.25.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Sound absorption of3He-B at 0 bar was studied at a frequency of 10 MHz. We performed pulsed experiments with different pulse lengths (4 to 15 μs) and pulse powers (0.1 to 160 μW) in the temperature range 0.2 〈 T/TC 〈 2. For pulse power less than pth ∼ 50 μW, and in the temperature range 0.4 to 0.8 Tc and zero field, the attenuation coefficient a decreases monotonically at about 0.2 cm−1 per decade of power. Above pth. α increases up to values of 3.5 cm−1 and 1.9 cm−1 at highest power for temperatures of 0.8 Tc and 0.4 Tc, respectively. At pulse power around 100 μW and at the lowest temperatures, the attenuation changes within the first 200 μs after the application of the pulse; α also increases with increasing field. In the normal fluid α decreases with increasing power. All of our observations are lacking a rigorous theoretical understanding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00753388
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  • 29
    Electronic Resource
    Electronic Resource
    Comment on pulsed NMR thermometry at very low temperatures (1988)
    Springer
    Journal of low temperature physics 73 (1988), S. 207-219 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract At temperatures below 1 mK the rf power in pulsed NMR experiments is normally kept as low as possible in order to minimize eddy current heating in the metallic samples used for thermometry. However, for metallic samples with short Korringa constants a temperature dependence enters via the spin-lattice relaxation mechanism in addition to the paramagnetic dependence. It may cause systematic errors if the temperature of the conduction electrons is raised by eddy current heating due to the action of the rf pulse to a temperatureT e which is not very small compared to ω1κ, with κ being the Korringa constant and ω1 the rotation frequency of the nuclear moments in the rf field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681977
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  • 30
    Electronic Resource
    Electronic Resource
    Asymptotic approach to a theory of multiple spin echoes in the low-temperature phases of3He (1984)
    Springer
    Journal of low temperature physics 56 (1984), S. 315-330 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss the phenomenon of multiple spin echoes induced by tipping angle-dependent frequency shifts. A general expression for the echo amplitudes neglecting diffusion effects is given as a spatial integral over a periodicity interval. The asymptotic behavior of this formula in the limit of many echoes is discussed and compared with the exact solution and experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681447
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