# Neutron transfer reactions in halo effective field theory

## TL;DR

This paper employs halo effective field theory to accurately calculate neutron transfer reaction cross sections in neutron-rich beryllium-11, providing a systematic approach that incorporates core, neutron, and proton dynamics up to next-to-leading order.

## Contribution

It introduces a halo effective field theory framework for neutron transfer reactions, dynamically generating halo nuclei from contact interactions and including Coulomb effects perturbatively.

## Key findings

- Good agreement with experimental cross-section data
- Systematic inclusion of core and halo scale separation
- Perturbative treatment of Coulomb repulsion

## Abstract

Direct reaction experiments provide a powerful tool to probe the structure of neutron-rich nuclei like beryllium-11. We use halo effective field theory to calculate the cross section of the deuteron-induced neutron transfer reaction ${}^{10}\text{Be}(\text{d},\,\text{p}){}^{11}\text{Be}$. The effective theory contains dynamical fields for the beryllium-10 core, the neutron, and the proton. In contrast, the deuteron and the beryllium-11 halo nucleus are generated dynamically from contact interactions using experimental and ab initio input. The reaction amplitude is constructed up to next-to-leading order in an expansion in the ratio of the length scales characterizing the core and the halo. The Coulomb repulsion between core and proton is treated perturbatively. Finally, we compare our results to cross-section data and other calculations.