Speaker
Description
Understanding the nuclear properties from bare nuclear forces is one of the main topic in nuclear physics. The importance of three-nucleon forces ($3N$Fs), which appear when more than two nucleons interact, has been indicated in various nuclear phenomena, such as few-nucleon scattering, binding energies of nuclei, and equation of state of nuclear matter.
Nucleon-deuteron ($Nd$) scattering, where numerically exact solutions of the corresponding Faddeev equations for any $2N$- and $3N$-forces are feasible, offers a good opportunity to study dynamical aspects of 3$N$Fs, that are momentum, spin, and isospin dependences. Indeed the last two decades have witnessed the extensive experimental and theoretical investigations of the $Nd$ scattering performed in a wide range of incoming nucleon energies up to $E \sim 300 \rm ~MeV/nucleon$.
The four-nucleon ($4N$) systems could also play an important role for the study of $3N$Fs. $3N$F effects are expected to be sizable in the four-nucleon system. In addition, while the $Nd$ scattering is essentially a pure isospin $T = 1/2$ state, tests of the $T = 3/2$ channel in any 3NFs can be performed in a 4N system such as proton-$^3 \rm He$ scattering.
With the aim of exploring the 3NFs experimental programs of $Nd$ scattering as well as proton-$^3\rm He$ scattering using the polarized beam and target systems are on going at RIKEN, RCNP, and CYRIC in Japan.
In this conference we review these experiments and touch upon our future plan.
