Abstract
The core breakup or distortion effects in the neutron-halo nucleus are studied with an extended microscopic three-cluster model, in which the core particle, i.e., the cluster is described as a two-cluster system. The two-cluster description improves the tail behavior of the particle with respect to the standard harmonic-oscillator shell-model description, and makes the first excited state of the particle realistic. The allowance for the core breakup in enhances not only the binding energy but also the probability of the component. This model gives a binding energy and probability that are similar to the model, and both can reproduce the very small binding energy of The inclusion of the channel deepens the binding substantially only when added to the conventional model; when the extended three-cluster model is augmented by its contribution is insignificant. Our results show that, for a weakly bound system such as a halo nucleus, the core internal motion must be treated realistically since the tail behavior of the core affects the binding mechanism of the halo nucleons.
- Received 23 October 1998
DOI:https://doi.org/10.1103/PhysRevC.59.1432
©1999 American Physical Society