Deep-Inelastic Electron Scattering and the Quark Structure ofHe3

Deep-inelastic electron scattering from ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ at momentum transfers $1<~Q^2<~4$ (GeV/${\mathit{c})}^2$ is successfully described in a quark-cluster model of the nucleus. The quark-cluster probabilities and Fermi motion are obtained from a nuclear wave function consistent with low-energy data. A nucleon-bag (three-quark-cluster) radius of 0.45 fm provides an optimal description of the data. It fixes the geometrical probabilities at 0.83, 0.16, and 0.01 for three-, six-, and nine-quark clusters, respectively.