Search for three-nucleon force effects in analyzing powers for (p)over-right-arrowd elastic scattering

A series of measurements have been performed at KVI to obtain the vector an alyzing power Ay Of the H-2((p) over right arrow, pd) reaction as a functio n of incident beam energy at energies of 120, 135, 150, and 170 MeV. For al l these measurements, a range of upsilon (c.m) from 30 degrees to 170 degre es has been covered. The purpose of these investigations is to observe poss ible spin-dependent effects beyond two-nucleon forces. When compared to the ,predictions of Faddeev calculations, based on two-nucleon forces only, sig nificant deviations are observed at all energies and at center-of-mass angl es between 70 degrees and 130 degrees. The addition of present-day three-nu cleon forces does not improve the description of the data, demonstrating th e still insufficient understanding of the properties of three-nucleon syste ms.