Three-body Description of 2n-Halo and Unbound 2n-Systems: 22C and 26O

Jagjit Singh,W Horiuchi,L Fortunato,A Vitturi

doi:10.7566/jpscp.32.010029

Abstract

We study the two-neutron correlations in the ground state of the weakly-bound two-neutron halo nucleus $^{22}$C sitting at the edge of the neutron-drip line and also in the unbound nucleus $^{26}$O sitting beyond the neutron dripline. For the present study, we employ a three-body (core$+n+n$) structure model designed for describing the two-neutron halo system by explicit inclusion of unbound continuum states of the subsystem (core$+n$). We use either a density-independent or a density-dependent contact-delta interaction to describe the neutron-neutron interaction and its strength is varied to fix the binding energy. We report the configuration mixing in the ground state of these systems for different choices of pairing interactions.

Highlights

The new generation of radioactive ion beam facilities around the various parts of the globe has provided the access to the neutron-rich side of the nuclear chart
The structural spectroscopy of the two-body subsystem plays a vital role in the understanding the 3b-system
We have explored the role of different pairing interactions such as density independent (DI) contact-delta pairing interaction and density dependent (DD) contact-delta pairing interaction with the configuration mixing in the ground-state of these systems

Summary

Introduction

The new generation of radioactive ion beam facilities around the various parts of the globe has provided the access to the neutron-rich side of the nuclear chart. We have studied the pairing collectivity in the ground state of the 2n-halo 22 C and in the the 2n-unbound system 26 O. For this study we have used our recently implemented 3b-structure model (core+n + n) for the ground and continuum states of the 2n-halo nuclei [4,5,6].

Results

Conclusion