Resonances and continuum states of drip-line nuclei using the complex scaling method

TL;DR

This paper investigates the resonances and continuum states of helium isotopes near the drip line using the complex scaling method within the cluster orbital shell model, revealing detailed structure and decay processes.

Contribution

It applies the complex scaling method to analyze unbound helium isotopes, providing new insights into their resonance structures and decay mechanisms.

Findings

Spectroscopic factors of 7He and their relation to neutron removal strengths

Structure and resonance of 8He involving two-neutron pair coupling

Dominant sequential breakup process in 8He decay

Abstract

Resonances and continuum states of He isotopes are investigated using the cluster orbital shell model (COSM) with the complex scaling method (CSM). We discuss the following subjects: 1) Spectroscopic factors of the unbound nucleus 7He into the 6He-n components and their relation to the one-neutron removal strengths of 7He. The importance of the 6He(2+) resonance is shown. 2) Structure of five-body 0+ resonance of 8He from the viewpoint of the two-neutron pair coupling. The monopole strengths into five-body unbound states are also investigated. It is found that the sequential breakup process of 8He \to 7He+n \to 6He+n+n is dominant in the monopole excitation, while the contribution of 8He(0+_2) is negligible.