Positive muon Knight shift in graphite and Grafoil |
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Authors: | F N Gygax A Hintermann A Schenck W Studer A J van der Wal J H Brewer D R Harshman |
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Institution: | (1) Institute for Medium Energy Physics, ETH Zürich, c/o S.I.N., Ch-5234 Villigen, Switzerland;(2) Department of Physics, University of British Columbia, V6T2A3 Vancouver, B.C., Canada |
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Abstract: | Positive muon Knight shifts and relaxation rates were measured at room temperature in a graphite crystal and in a stack of Grafoil sheets. The Knight shift was 500 ppm in the single crystal and reduced by 0.702 in Grafoil. Both have the same (large) fractional anisotropy relative to the axis or to the normal to the Grafoil sheets, respectively. The (isotropic) relaxation rates were 0.024(4)s–1 in the crystal and 0.194(6)
–1 in the Grafoil. Apparently the
+ in Grafoil sees highly aligned bulk crystalline graphite, and does not reach the surfaces of the sheets.We are grateful to Greg Dash, the owner of the graphite crystal, for lending it to Tony Arrott; and to Tony for lending it in turn to us. |
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