Structure of 6He with an extended three-cluster model

The standard cluster model of the neutron-halo nucleus 6He assumes an α+n+n structure. The aim of this work was to examine effect of the dynamical breakup of the α-particle in 6He. The extended model used treats the α-particles as a 3N + N two-cluster system. As an alternative model, a t+t component was added to the α+n+n component. The breakup and the t+t channel have much the same effect: they deepen the intercluster binding substantially and enhance the probability of the t+t component, especially in the asymptotic region. When the two improvements were combined, no further substantial change was found. An explanation of these results is given. (K.A.)