Spin–isospin selectivity in three-nucleon forces

摘要

Precision data are presented for the break-up reaction, 2H(p, pp)n, within the framework of nuclear-force studies. The experiment was carried out at KVI using a polarized-proton beam of 190 MeV impinging on a liquid-deuterium target and by exploiting the detector, BINA. Some of the vector-analyzing powers are presented and compared with state-of-the-art Faddeev calculations including three-nucleon forces effect.Significant discrepancies between the data and theoretical predictions were observed for kinematical configurations which correspond to the 2H(p, 2He)n channel. These results are compared to the 2H(p,d)preaction to test the isospin sensitivity of the present three-nucleon force models. The current modeling of two and three-nucleon forces is not sufficient to describe consistently polarization data for both isospin states.