Speaker
Description
Necessity of the three-nucleon forces (3NFs) have come to light in various nuclear phenomena, for example, binding energies of nuclei, and equation of state in nuclear matters. As numerically exact solutions of the Faddeev equations using 2N- and 3N-forces are now attainable for observables in nucleon-deuteron (Nd) scattering, intricate information of the 3NFs can be extracted by directly comparing high precision data obtained in Nd experiments and theoretical calculations. Various performances of deuteron-proton (d-p) elastic scattering experiments at 70-300 MeV/nucleon (MeV/N) have confirmed clear signatures of 3NF effects in results of the cross sections below 135 MeV/N, whereas data of spin observables and cross sections at 250 MeV/N or above have suggested deficiencies in the spin dependent parts and high momentum transfer regions of current 3NF models.
In view of determining the 3NFs, we plan to measure the spin correlation coefficients in d-p elastic scattering at 100 MeV/N and see how the observables are described by potentials based on chiral effective field theory. The experiment will be performed at RIKEN RIBF facility, employing the polarized deuteron beam provided via the polarized ion source, in combination with the polarized proton solid-state target and the detector system, both of which have been newly developed for this experiment.
We also focus on proton-3He (p-3He) scattering experiments, with the aim to observe 3NFs effects such as the iso-spin channels of T=3/2. Data of differential cross sections, analyzing powers, and spin correlation coefficients at intermediate energies have been taken at RCNP and CYRIC, employing polarized beam and target systems.
In this conference, detailed explanations and future plans on the new d-p and p-3He scattering experiments will be given.
