We have measured the 3He(e, e', pp)n reaction at an incident energy of 4.7 GeV over a wide kinematic range. We identified spectator correlated pp and pn nucleon pairs by using kinematic cuts and measured their relative and total momentum distributions. This is the first measurement of the ratio of pp to pn pairs as a function of pair total momentum ptot. For pair relative momenta between 0.3 and 0:5 GeV / c, the ratio is very small at low ptot and rises to approximately 0.5 at large ptot. This shows the dominance of tensor over central correlations at this relative momentum.

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Copyright © 2010 American Physical Society. This article first appeared in Physical Review Letters 105, no. 22 (November 24, 2010): 222501:1-5. doi:10.1103/PhysRevLett.105.222501.

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