Measurement of two-and three-nucleon shortrange correlation probabilities in nuclei KS The ratios of inclusive electron scattering cross sections of 4 He, 12 C, and 56 Fe to 3 He have been measured at 1 < x B < 3. At Q 2 > 1:4 GeV 2 , the ratios exhibit two separate plateaus, at 1:5 < x B < 2 and at x B > 2:25. This pattern is predicted by models that include 2-and 3-nucleon short-range correlations (SRC). Relative to A 3, the per-nucleon probabilities of 3-nucleon SRC are 2.3, 3.1, and 4.4 times larger for A 4, 12, and 56. This is the first measurement of 3-nucleon SRC probabilities in nuclei.

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Deep-inelastic electron scattering from 40 Ca, 48 Ca, and 56 Fe has been measured at 60°, 90°, and 140° and at inelasticities up to and including the A (3, 3) region. Longitudinal response functions in the momentum interval 300 MeV/c < |q| < 600 MeV/c were extracted. The experimental Coulomb sum rule is observed between the two calcium isotopes.