Molecular-orbital structure in neutron-rich C isotopes
Molecular-orbital structure in neutron-rich C isotopes
The moleculelike structure of the C isotopes $(A=12,14,16)$ is investigated using a microscopic $\ensuremath{\alpha}+\ensuremath{\alpha}+\ensuremath{\alpha}+n+n+\ensuremath{\cdot}\ensuremath{\cdot}\ensuremath{\cdot}$ model. The valence neutrons are classified based on the molecular-orbit model, and both $\ensuremath{\pi}$ orbit and $\ensuremath{\sigma}$ orbit are introduced around three $\ensuremath{\alpha}$ clusters. The valence neutrons which occupy the $\ensuremath{\pi}$ orbit increase the binding energy …