Investigation of ${}^9$Be from nonlocalized clustering concept

TL;DR

This paper extends the nonlocalized clustering concept using a modified THSR wave function to effectively describe the structure of ${}^9$Be, demonstrating high overlap with other models and reproducing key features like the {\

Contribution

It introduces a negative-parity THSR wave function tailored for ${}^9$Be, highlighting nonlocalized clustering as a dominant structure.

Findings

The wave function accurately describes ${}^9$Be's cluster states.

Calculated properties match experimental and other model results.

High overlap (96%) with Brink+GCM wave function indicates model validity.

Abstract

The nonlocalized aspect of clustering, which is a new concept for self-conjugate nuclei, is extended for the investigation of the N{\not=}Z nucleus ${}^9$Be. A modified version of the THSR (Tohsaki-Horiuchi-Schuck-R\"opke) wave function is introduced based on the container picture. It is found that the constructed negative-parity THSR wave function is very suitable for describing the cluster states of ${}^9$Be. Namely the nonlocalized clustering is shown to prevail in ${}^9$Be. The calculated binding energy and radius of ${}^9$Be are consistent with calculations in other models and with experimental values. The squared overlaps between the THSR wave function and the Brink+GCM wave function for the $3/2^-$ rotational band of ${}^9$Be are found to be near 96%. Furthermore, by showing the density distribution of the ground state of ${}^9$Be, the {\pi}-orbit structure is naturally reproduced by using this THSR wave function.