Abstract :
[en] We study the nucleon-nucleon interaction in a chiral constituent quark model by
using the resonating group method, convenient for treating the interaction
between composite particles. The calculated phase shifts for the $^3S_1$ and
$^1S_0$ channels show the presence of a strong repulsive core due to the
combined effect of the quark interchange and the spin-flavour structure of the
effective quark-quark interaction. Such a symmetry structure stems from the
pseudoscalar meson exchange between the quarks and is a consequence of the
spontaneous breaking of the chiral symmetry. We perform single and coupled
channel calculations and show the role of coupling of the $\Delta\Delta$ and
hidden color $CC$ channels on the behaviour of the phase shifts.
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