One-neutron removal strength of 7He into 6He using the complex scaling method

TL;DR

This paper employs the complex scaling method to analyze the one-neutron removal strength of 7He, revealing detailed contributions of resonant and nonresonant states, and proposing a novel approach to extract real-valued strengths from complex spectroscopic factors.

Contribution

It introduces a complex scaling framework to accurately describe continuum states and proposes a method to derive real-valued strengths from complex Gamow state factors.

Findings

6He(2+) resonance dominates the removal strength

Resonant and nonresonant contributions produce distinct spectral structures

The method enables extraction of real strengths from complex spectroscopic data

Abstract

We study the one-neutron removal strength of the 7He ground state, which provides us with the 6He-n component in 7He. The He isotopes are described on the basis of the 4He+Xn cluster model (X=1,2,3). The complex scaling method is applied to describe not only the Gamow resonances but also the nonresonant continuum states of valence neutrons, with the correct boundary condition of particle decays. The one-neutron removal strength of 7He into the unbound states of 6He is calculated using the complex-scaled Green's function, in which a complex-scaled complete set of 4He+n+n states is adopted. Using this framework, we investigate resonant and nonresonant contributions of the strength, which individually produce specific structures in the distributions. In addition, we propose a method to obtain the real-value strength using the complex values of spectroscopic factors of Gamow states. As a result, the 6He(2+) resonance is found to give the largest contribution.