Precise Measurement ofdpElastic Scattering at 270 MeV and Three-Nucleon Force Effects

The cross section, the deuteron vector $A_y^d$ and tensor analyzing powers $A_{\mathrm{ij}}$, the polarization transfer coefficients $K_{\mathrm{ij}}^{y^{\prime }}$, and the induced polarization $P^{y^{\prime }}$ were measured for the $\mathrm{dp}$ elastic scattering at 270 MeV. The cross section and $A_y^d$ are well reproduced by Faddeev calculations with modern data-equivalent nucleon-nucleon forces plus the Tucson-Melbourne three-nucleon force. In contrast, $A_{\mathrm{ij}}$, $K_{\mathrm{ij}}^{y^{\prime }}$, or $P^{y^{\prime }}$ are not described by such calculations. These facts indicate the deficiencies in the spin dependence of the Tucson-Melbourne force and call for extended three-nucleon force models.