高励起領域における^<12>Beの分子的共鳴状態(軽い核におけるクラスター構造の発達(I),不安定核の構造と反応,研究会報告)

抄録

In the present paper, we have performed the coupled-channel calculation of the ^6He+^6He scattering at low energies by taking into account the soft-dipole and quadrupole excitation modes of the colliding ^6He nuclei in the extended Goldhaber-Teller model. The inter-nucleus interactions, both the diagonal and coupling ones, are calculated by the double-folding model with the use of the density-dependent M3Y NN interaction and ^6He densities calculated from the α+n+n cluster model. The transition densities for the soft-mode excitations are calculated based on the extended Goldhaber-Teller model assuming the virtual 1^- and 2^+ states representing the soft-mode excitations of ^6He. The coupled-channel calculation predicts many resonance states in the energy range where the resonances were observed in the ^<12>Be → ^6He+^6He breakup experiment and that the energies and spins of the calculated resonances well agree with the experimental observations. The calculated resonances are found to be the members of different kinds of molecular rotational bands which are generated by the crossing and coupling among the molecular bands in the elastic and inelastic channels. Thus, the soft-mode excitations of ^6He plays an essential role in the resonance formation.