alpha-cluster structure of 18Ne

TL;DR

This study investigates alpha-clustering in 18Ne through experimental measurements and theoretical analysis, revealing robust isospin-symmetric clustering structures and providing detailed spectroscopic information that enhances understanding of nuclear clustering phenomena.

Contribution

It provides new experimental data on 18Ne's alpha-cluster states and compares these with theoretical models, highlighting the organization and strength of clustering in relation to reaction channels.

Findings

Clustering structures are robust and mostly isospin symmetric.

Good correspondence between 18Ne and 18O levels.

Certain high-energy states are more clustered than predicted.

Abstract

In this work we study alpha-clustering in 18Ne and compare it with what is known about clustering in the mirror nucleus 18O. The excitation function of 18Ne was measured in inverse kinematics from the resonant elastic scattering reaction of 14O on 4He in the excitation energy range from 8 to 17 MeV, using the active target TexAT. The analysis was performed using a multi-channel R-matrix approach. Detailed spectroscopic information is obtained from the R-matrix analysis: excitation energy of the states, spin and parity as well as partial alpha and total widths. This information is compared with theoretical models and previous data. Clustering structures appear to be robust and mostly isospin symmetric. A good correspondence was found between the levels in 18O and 18Ne. We carried out an extensive shell model analysis of the experimental data. This comparison suggests that strongly clustered states remain organized in relation to the corresponding reaction channel identified by the number of nodes in the relative alpha plus core wave function. The agreement between theory and experiment is very good and especially useful when it comes to understanding the clustering strength distribution. The comparison of the experimental data with theory shows that certain states, especially at high excitation energies, are significantly more clustered than predicted. This indicates that the structure of these states is collective and is aligned towards the corresponding alpha reaction channel.