Abstract
We studied the roles of the tensor and pairing correlations on the halo formation in with an extended model. We first solved the ground state of in the shell-model basis by taking 2p-2h states using the Gaussian functions with variational size parameters to take into account the tensor correlation fully. In , the tensor and pairing correlations in are Pauli blocked by additional two neutrons, which work coherently to make the configurations containing the -state pushed up and close to those containing the -state. Hence, the pairing interaction works efficiently to mix the two configurations by equal amount and develop the halo structure in . For , the inversion phenomenon of - and -states is reproduced in the same framework. Our model furthermore explains the recently observed Coulomb breakup strength and charge radius for .
- Received 30 July 2006
DOI:https://doi.org/10.1103/PhysRevC.76.024305
©2007 American Physical Society