Abstract
We study the deformation landscape of the neutron-rich carbon isotope 16C in the framework of three different mean-field models. Furthermore, in a beyond-mean-field approach, collective properties are calculated. We find that this nucleus is extremely soft in overall quadrupole deformation and triaxiality. The actual ground state and excitations will be highly correlated by a coherent mix of very different shapes. Moreover, proton and neutron distributions have very different shapes, concerning radius and deformation. This suggests that the low-lying collective excitations decouple into proton and neutron modes with the neutron mode being softer, in qualitative agreement with recent experimental findings.
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