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  • 1
    Electronic Resource
    Electronic Resource
    Planar array of superheated superconductors: An improved superheated superconducting granule detector (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2234-2236 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have invented a new superheated superconducting granule detector which is a prime candidate for sensing dark matter and which could prove very useful for other applications. The sensor element is a planar array of spherical granules for which the spread in transition temperatures is nearly an order of magnitude smaller than that for a colloidal device. The detecting efficiency for low-energy deposition is thereby significantly increased. Preliminary results are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102953
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Thermometric detection of nuclear magnetic resonance (1973)
    Springer
    Journal of low temperature physics 10 (1973), S. 217-223 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Nuclear magnetic resonance has been detected in nonmagnetic materials by observing the temperature rise in the sample. The experiments were performed at temperatures between 1 and 4 K, and results are presented for the27Al resonance in aluminum metal and the19F resonance in a sample of doped CaF2. The primary sources of noise have been identified and ways of improving the apparatus are discussed. The technique could prove useful in experiments that require a large range of frequencies to be swept and in experiments investigating the effects of strong rf fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655254
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  • 4
    Electronic Resource
    Electronic Resource
    Progress in the development of the tin PASS granule detector (1993)
    Springer
    Journal of low temperature physics 93 (1993), S. 461-466 
    Details
    ISSN: 1573-7357
    Keywords: 07 ; 85.25.-j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Progress in the development of a PASS granule detector is reported. Arrays with small tin spheres, with radius r⋍2µm, have been fabricated. The responses of tin PASS samples, with r⋍2 µm and r=8 µm, to low energy γ-radiation have been measured and analyzed. Also the performance of a multilayer PASS has been investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693461
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  • 5
    Electronic Resource
    Electronic Resource
    Pulsed FM NMR/ON studies of60Co nuclei in iron in large applied magnetic fields (1981)
    Springer
    Hyperfine interactions 10 (1981), S. 1149-1154 
    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/BF01022067
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  • 6
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance of oriented54Mn nuclei in antiferromagnetic MnCl2 · 4H2O (1981)
    Springer
    Hyperfine interactions 11 (1981), S. 197-202 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Nuclear magnetic resonance of oriented54Mn nuclei in antiferromagnetic MnCl2 · 4H2O has been observed. The first two lines of the sextuplet split by quadrupole interaction are at frequencies 500.4 and 514.7 MHz, implying a hyperfine field of 643(5) kG. The stronger line at 500.4 MHz has a half-width at half maximum of 60 kHz and is shifted downward and split in frequency on application of a magnetic field. The nuclear spin-lattice relaxation time is dependent both on the applied field and the size and/or quality of the crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01026477
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  • 7
    Electronic Resource
    Electronic Resource
    Nuclear orientation in antiferromagnets (1978)
    Springer
    Hyperfine interactions 4 (1978), S. 362-366 
    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/BF01021852
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  • 8
    Electronic Resource
    Electronic Resource
    Nuclear spin-lattice relaxation in54Mn-MnCl2.4H2O and lower dimensional magnetic systems (1989)
    Springer
    Hyperfine interactions 51 (1989), S. 1111-1118 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on nuclear spin-lattice relaxation studies on54Mn-MnCl2.4H2O and 2-dimensional54Mn-Mn(COOCH3)2.4H2O. In the former crystal, we find that at the lowest temperatures a direct process, normally thought of as forbidden, becomes the mechanism for relaxation. In lower dimensional systems the relaxation might be expected to be relatively fast and indeed in the acetate the relaxation timeT 1 is ≈1000 s in an applied field of 0.2 T for the Mn2 site and is much shorter at lower fields. In 1-dimensional54Mn-(CH3)4NMnCl3(TMMC) a significant γ-ray anisotropy is observed on cooling indicating thatT 1 is also short in this system. The shortness ofT 1 in the lower dimensional systems suggests that they may be suitable hosts for on-line experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02407836
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  • 9
    Electronic Resource
    Electronic Resource
    Pulsed NMRON measurements on insulators (1992)
    Springer
    Hyperfine interactions 75 (1992), S. 261-268 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Selective single and double quantum excitation pulsed NMRON has been utilized to obtain rotation patterns, free induction decays, and spin echoes in antiferromagnetic54Mn−MnCl2·4H2O and the quasi-2 dimensional ferromagnet54Mn−Mn(COOCH3)2·4H2O. The pulsed technique is well suited to observing fast spin-lattice relaxation and T1 values down to 100 ms have been measured in these systems. These short times may make magnetic insulators viable hosts for on-line experiments. The dependence on field and temperature of the54Mn spin-lattice relaxation time T1 has been investigated and a T1 minimum at high fields observed in both systems. A spin-spin relaxation time T2≈50 μs is measured in54Mn−MnCl2·4H2O. The observation of NMRON in the paramagnetic phase of MnCl2·4H2O allows the resonant frequencies in the antiferromagnetic and paramagnetic phases to be compared, yielding a value for the zero point spin deviation in the former phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02398981
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  • 10
    Electronic Resource
    Electronic Resource
    The determination of magnetic structures using low temperature nuclear orientation:166mHo-Ho (1981)
    Springer
    Hyperfine interactions 11 (1981), S. 205-222 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is demonstrated that the low temperature nuclear orientation technique can be used to determine the axes of quantization in a multiaxial ordered ensemble of nuclear spins. Expressions for the anisotropic γ-ray intensity from particular geometries are derived for the case in which each subsystem has its own axial symmetry. The determination of the atomic magnetic structure in antiferromagnets is discussed and the results of recent experiments on helically ordered166mHo-Ho are presented. In these experiments, the angular variation of the intensities of some of the more intense γ-rays were measured and compared to theory. A value of 80.4(1)°, not including systematic errors, was obtained for the semi-cone angle of the helix formed by the atomic magnets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01026479
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