ANALYZING POWER MEASUREMENTS FOR THE (D)OVER-RIGHT-ARROW-]D+P+N BREAKUP REACTION AT 12 MEV(D)

We report the most extensive set of vector iT(11) and tensor T-20 and T-22 analyzing-power data for the (d) over right arrow+d-->d+p+n react ion. Two-particle coincidence data have been measured for six deuteron -proton, three deuteron-neutron and three proton-neutron angle pairs a t an incident deuteron energy of 12.0 MeV. These data are compared to impulse-approximation calculations that treat the underlying nucleon-d euteron system exactly and include contributions from both target and projectile breakup processes. This model gives a good description of t he analyzing-power and relative cross-section data. We show that the i nclusion of nucleon-nucleon P interactions considerably improves the a greement with the spin observables. The disagreement between the data and theoretical predictions show the limitations in our model and the importance of the rescattering processes. We suggest that the d+d thre e-body breakup process will provide useful information on the nucleon- nucleon force when exact calculations become available.