27-10-2012, 10:53 AM
Measurements of Correlated Pair Momentum Distributions in (sup 3)He(e, e prime pp)n With CLAS
ABSTRACT
We have measured the(sup 3)He(e,e(prime)pp)n reaction at 2.2 and 4.4 GeV over a wide kinematic range. The kinetic
energy distribution for ‘fast’ nucleons (p \g 250 MeV/c) peaks where two nucleons each have 20% or less and the third or
‘leading’ nucleon carries most of the transferred energy. These fast nucleon pairs (both pp and pn) are back-to-back and carry
very little momentum along(rvec q), indicating that they are spectators. Experimental and theoretical evidence indicates that
we have measured NN correlations in(sup 3)He(e,e(prime)pp)n by striking the third nucleon and detecting the spectator
correlated pair.