30 Result(s)

Article

Search for superconductivity in lithium and magnesium

Recent theoretical work suggests that magnesium and lithium should be superconducting in the m°K temperature range. We have cooled samples of each of these metals to a temperature of 4 m°K, measured by a gamma...

T. L. Thorp, B. B. Triplett, W. D. Brewer… in Journal of Low Temperature Physics (1970)

Article

Critical field for superconductivity and low-temperature normal-state heat capacity of tungsten

We have measured the critical magnetic field for superconductivity in tungsten from 5.5 to 15 mK using a γ-ray anisotropy thermometer, and we have measured the heat capacity between 0.35 and 25 K. Analysis of ...

B. B. Triplett, N. E. Phillips, T. L. Thorp… in Journal of Low Temperature Physics (1973)

Article

NMR detected by Mössbauer-effect, applied to the system⁵⁷CoFe

The detection of NMR in oriented nuclei via the Mößbauer effect in the daughter state is described and its specific advantages and drawbacks compared to other methods. As an example, the NMR of⁵⁷Co in Fe was obse...

R. Laurenz, E. Klein, W. D. Brewer in Zeitschrift für Physik (1974)

Article

Nuclear orientation of⁶⁰Co in concentrated CoAu alloys

We report β-particle and γ-ray angular distribution measurements from⁶⁰Co oriented in CoAu at low temperatures in applied fields up to 72 kOe and Co concentrations of 0.95 to 11 at.%. The results are explained by...

J. Boysen, W. D. Brewer, E. Klein in Hyperfine Interactions (1975)

Article

Nuclear resonance studies of⁹⁵NbFe

Dilute alloys of 35-day⁹⁵Nb in polycrystalline iron have been studied by nuclear magnetic resonance on oriented nuclei (NMR/ON) using frequency modulation and fast passage techniques. Comparison of resonance freq...

M. Kopp, W. D. Brewer in Hyperfine Interactions (1977)

Article

Nuclear orientation of AgMn alloys

J. Sanchez, J. Flouquet, W. D. Brewer in Hyperfine Interactions (1978)

Article

Nuclear quadrupole alignment of Lu, In, and Zn

W. D. Brewer, G. Kaindl in Hyperfine Interactions (1978)

Article

Nuclear orientation of⁴⁸V in Fe and Co and NMR of⁴⁸VFe

Observations of the anisotropies of the 984 and 1312 keV γ-rays from⁴⁸VFe and⁴⁸VCo in fields up to 4 T and temperatures down to 4 mK show extremely long nuclear spin-lattice relaxation times (3–4 h in Fe, 8 h in ...

K. D. Bures, W. D. Brewer, G. V. H. Wilson in Hyperfine Interactions (1980)

Article

Hyperfine fields at Mn and Cr in ZrFe₂

A. Heidari-Dehkordi, J. Boysen, W. D. Brewer in Hyperfine Interactions (1981)

Article

Magnetization behavior of polycrystalline and single-crystal Tb and impurity HFI in heavy rare earths

J. Grimm, W. D. Brewer, J. Boysen, G. V. H. Wilson in Hyperfine Interactions (1981)

Article

Recent developments in radiative detection of nuclear magnetic resonance

A review is given of various methods for the detection of nuclear magnetic resonance using nuclear radiations. After a discussion of the physical basis of the different methods, emphasizing their common featur...

W. D. Brewer in Hyperfine Interactions (1982)

Article

Nuclear orientation of thermally prepared^114mInCu by the brute-force method

We report the results of brute-force orientation experiments on several alloys of^114mInCu prepared by different thermal methods, with the goal of clarifying the origins of the deviations from the theoretical nucl...

J. Boysen, W. D. Brewer, A. Kettschau in Hyperfine Interactions (1983)

Article

Nuclear quadrupole alignment in Zn, Lu, and Re and the quadrupole moments of^69m Zn and^177m Lu

We report low-temperature nuclear quadrupole alignment of^69m Zn,^{177m, g} Lu and^{186, 188}Re in the corresponding metal single crystal hosts. A comparison with data on these systems from other laboratories is given, ...

D. Oertel, A. Kettschau, W. D. Brewer… in Zeitschrift für Physik A Atoms and Nuclei (1983)

Article

Nuclear spin-lattice relaxation of dilute Mn in Cu, Ag, and Au

We have developed a new method of determining nuclear spinlattice relaxation times of dilute impurity nuclei in non-magnetic host metals. Direct measurement of these extremely rapid relaxation times has hither...

W. D. Brewer, A. Kettschau, E. Kleih in Hyperfine Interactions (1983)

Article

Nuclear orientation of the rare-earth system \(^{160} Tb\underline {Tb} \) (sc)

We report precision nuclear orientation measurements on a bulk¹⁶⁰TbTb single crystal sample. The results of these experiments allow us to determine the hyperfine parameters for this system, as well as precise mul...

H. Marshak, W. D. Brewer, P. Roman in Hyperfine Interactions (1988)

Article

Low-temperature dynamics of local-moment systems investigated by thermal cycling methods

We report studies of the low-temperature dynamics of several dilute alloy systems in which local moments are present, using various thermal-cycling nuclear orientation methods. Determinations of nuclear spin-l...

W. D. Brewer, M. Böttcher, M. Hoffmann, E. Klein, P. Roman in Hyperfine Interactions (1988)

Article

Precision nuclear orientation measurements for determining mixed magnetic dipole/electric quadrupole hyperfine interactions

We report the temperature dependence of the gamma-ray anisotropies from oriented¹⁶⁰Tb nuclei produced by neutron activation of the central portion of a high-purity single crystal Tb slab. The magnetically saturat...

W. D. Brewer, P. Roman, H. Marshak in Hyperfine Interactions (1989)

Article

Static and dynamic hyperfine interactions of Mn and Co impurities in the weak ferromagnet ZrZn₂

We report the nuclear orientation of near-stoichiometric samples of ZrZn₂ containing trace impurities of radioactive⁵⁴Mn and⁶⁰Co in the temperature range 6.5–60 mK and in applied fields between 0.2 and 5.7 T. Ana...

M. Hoffmann, M. Böttcher, W. D. Brewer in Hyperfine Interactions (1989)

Article

Magnetization of single-crystal terbium at very low temperatures by nuclear orientation

We report an investigation of the magnetization of high-purity single crystal terbium below 50 mK, using the nuclear orientation of¹⁶⁰Tb, which substitutionally replaces naturally-occurring, monoisotopic¹⁵⁹Tb. Th...

H. Marshak, P. Roman, W. D. Brewer in Hyperfine Interactions (1989)

Article

Fast nuclear relaxation in CoPd alloys studied by nuclear orientation-fast heating

We have studied the nuclear spin-lattice relaxation of Co nuclei in the Co concentration range from 1.6 ppm to 1%, using alloys containing radioactive⁶⁰Co and a nuclear orientation-fast pulsed heating (NO-FH) met...

M. Böttcher, W. D. Brewer, E. Klein in Hyperfine Interactions (1989)