Abstract
Recent experimental results related to the quadrupole collectivity in neutron-rich carbon isotopes are analyzed in a phenomenological approach. transitions rates derived from lifetime measurements are interpreted in terms of the mixing of basic neutron and proton excitations. A seniority inspired scheme is used to describe the neutron component. The observed increase in collectivity can be explained with a corresponding increased role of proton excitations. This is likely due to the reduction of the proton spin-orbit splitting caused by the tensor and two-body spin-orbit components of the force between the protons and the added neutrons in the () shells.
- Received 13 August 2014
- Revised 30 September 2014
DOI:https://doi.org/10.1103/PhysRevC.90.067305
©2014 American Physical Society