Inelastic neutron scattering, combined with Brillouin and elastic small-angle neutron scattering, were used to test universality in the spectral dimension d ̃ \~{}{}. The fracton density of states, obtained here on a new fractal silica aerogel and over a large frequency interval, now gives d ̃ \~{}{}{}1.8. This suggests that d ̃ \~{}{} is a sensitive function of the fractal structure.
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Vacher et al. (1989) studied this question.
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