Comment on "Five-Body Cluster Structure of the Double-Lambda Hypernucleus Lambda-Lambda-11Be"

TL;DR

This paper evaluates the interpretations of Lambda-Lambda hypernuclei Lambda-Lambda-11Be and Lambda-Lambda-12Be for the HIDA event using shell-model estimates, challenging previous five- and six-body cluster model calculations.

Contribution

It introduces shell-model estimates to analyze Lambda-Lambda hypernuclei, providing a different perspective from prior cluster-model calculations.

Findings

Neither Lambda-Lambda-11Be nor Lambda-Lambda-12Be explains the HIDA event.

Shell-model estimates reproduce the binding energy of Lambda-Lambda-13B.

The shell model approach is validated against experimental data.

Abstract

Hiyama et al. [PRL 104 (2010) 212502] have recently reported on a pioneering five-body alpha-alpha-n-Lambda-Lambda cluster-model calculation of Lambda-Lambda-11Be in order to confront a possible interpretation of the KEK-E373 HIDA event. Unfortunately, a six-body alpha-alpha-n-n-Lambda-Lambda calculation of Lambda-Lambda-12Be to confront another possible interpretation is beyond reach at present. Using experimental B-Lambda values with small corrections based on recently determined Lambda-N spin-dependent interaction parameters, we obtain binding-energy shell-model estimates for both Lambda-Lambda hypernuclei, concluding that neither Lambda-Lambda-11Be nor Lambda-Lambda-12Be provide satisfactory interpretation of the HIDA event. The shell model approach is tested by reproducing the measured double-Lambda binding energy of the double-Lambda hypernucleus Lambda-Lambda-13B.