**Investigating
the role of the tensor
force in heavy-ion collisions using nucleus-nucleus potential
description**,
Y. Iwata, *Extreme Matter Institute, GSI, Darmstadt, Germany *−
In low-energy
heavy-ion collisions, fusion is not necessarily achieved,
neither is
fragmentation. Reaction dynamics and the resulting products can
be drastically
different depending on the impact parameter, the mass of
colliding ions, and so
on (for example, see [1]).
Among many
factors, the spin-orbit effect has been clarified to play one of
the most
important roles in determining final products.

Recently
the
tensor force has been gathering special attention in terms of
explaining
the structure of exotic nuclei. The tensor and spin-orbit forces
contribute
essentially to the formation of the spin mean field, and give
rise to the same
dynamical effect, namely spin polarization. In this talk, based
on
time-dependent density functional calculations, the tensor
force, which usually
acts like a small correction to the spin-orbit force, is shown
to become more
important in reaction dynamics [2].
Furthermore the tensor force effect is investigated with
respect to the
diabatic nucleus-nucleus potential structure [3], where the
diabatic
nucleus-nucleus potentials are obtained from the time-dependent
density
functional calculations without any intentional assumptions.

[1]
Y. Iwata, T.
Otsuka, J. A. Maruhn and N. Itagaki, Phys. Rev. Lett. **104**, 252501 (2010).

[2]
Y. Iwata and J.
A. Maruhn, Phys. Rev. C **84**,
014616
(2011).

[3]
Y. Iwata and H. Feldmeier, in
preparation.