Electromagnetic properties of the Be-11 nucleus in Halo EFT

TL;DR

This paper uses Halo Effective Field Theory to calculate electromagnetic properties of Be-11, achieving predictions consistent with experimental data by exploiting the separation of scales in this halo nucleus.

Contribution

The work applies Halo EFT to predict electromagnetic observables of Be-11, incorporating measured data to fix parameters and demonstrating agreement with experiments at leading order.

Findings

Predicted B(E1) transition strength matches experimental data.

Computed charge radius aligns with measurements.

Framework allows systematic inclusion of higher-order corrections.

Abstract

We compute electromagnetic properties of the Be-11 nucleus using an effective field theory that exploits the separation of scales in this halo system. We fix the parameters of the EFT from measured data on levels and scattering lengths in the Be-10 plus neutron system. We then obtain predictions for the B(E1) strength of the 1/2^+ to 1/2^- transition in the Be-11 nucleus. We also compute the charge radius of the ground state of Be-11. Agreement with experiment within the expected accuracy of a leading-order computation in this EFT is obtained. We also indicate how higher-order corrections that affect both s-wave and p-wave Be-10-neutron interactions will affect our results.