Study of the 1H(d, pp) and 2H(p, pp) breakup reaction in the off-plane star configuration at 13 MeV

Recently the data of the differential cross sections for the 1H (d,pp)n breakup reactions in the off-plane star configurations at Ed = 19 MeV are reported. This study covers the kinematical configurations in which all three nucleons in the final state scattered with equal magnitudes of momenta in the c.m. system. The comparison of the data with the Faddeev calculations showed large discrepancies, which we call ``off-plane star anomaly.'' To clarify the cause of this anomaly, we carried out the measurement of the 1H(d, pp)n reactions at Ed = 26MeV at RCNP and that of the 2H(p, pp)n reactions at Ep = 13 MeV at KUTL. By carrying out these experiments, we obtained the data for the almost full angular range of the alpha. We are going to show the preliminary results of the differential cross sections along the S-curve and compare these results to the Faddeev calculations. Our data is well reproduced by the calculations including the Coulomb, which is different from the results of Koln at 19 MeV.