Abstract
We studied dipole excitations in based on an extended version of the antisymmetrized molecular dynamics, which can describe 1p-1h excitations and large amplitude cluster modes. Toroidal and compressive dipole operators are found to be good proves to separate the low-energy and high-energy parts of the isoscalar dipole excitations, respectively. Two low-energy states, the toroidal dominant state at MeV and the dominant state at MeV, were obtained. By analysis of transition current densities, the state is understood as a toroidal dipole mode with exotic toroidal neutron flow caused by rotation of a deformed cluster, whereas the state is regarded as a neutron-skin oscillation mode, which are characterized by surface neutron flow with inner isoscalar flow caused by the surface neutron oscillation against the core.
6 More- Received 18 April 2017
DOI:https://doi.org/10.1103/PhysRevC.95.064319
©2017 American Physical Society