Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NMR lineshape of $^{29}$Si in single-crystal silicon   We report measurements of the NMR lineshape of 4.685\% abundant $^{29}$Si in
single-crystal silicon for four different crystallographic orientations
relative to the applied magnetic field. To avoid significant inhomogeneous
broadening, the sample crystals are immersed in a susceptibility matched liquid
and the proton NMR lineshape in the liquid is used to measure the residual
susceptibility mismatch and to shim the applied field. The observed lineshapes
are in good agreement with disorder-averaged spin dynamics simulations
performed on a $4 \times 4 \times 4$ unit cell lattice with periodic boundary
conditions. The splitting of resolved doublet features is used to measure the
asymmetry $\Delta J$ of the nearest-neighbor indirect dipole or J-coupling
tensor, with the result $\Delta J=90\pm20$ Hz. All resolved doublets can be
identified with specific nearest and next-nearest neighbor isolated spin pairs
that occur in the disorder ensemble.

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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: hep-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: cs