2H(d.pd) reaction at deuteron beam energy of 13.6 MeV

Proton-deuteron (pd) coincidence spectra from the d + d reaction are measured at deuteron beam energy E0 approx 13.6 MeV. Emission angles θp / θd = 39.3/39.3 degree; 39,3/31,0 degree, φp - φd = 180 degree are taken to account the neutron-proton (np) final state interaction (FSI) and in some degree to diminish the influence of other mechanisms. The experimental results are compared to theoretical calculations using the Watson-Migdal approximation for up FSI in the 3S1 and 1S0 (isospin forbidden) states. At symmetric angles, the optimum fitting is obtained with the impurity of a singlet state equal to (8 ± 2)%; in the non symmetrical geometry, the contribution of a singlet state is not found