Detailed Study of the Eikonal Reaction Theory for the breakup of one-neutron halo nuclei

TL;DR

This paper evaluates the Eikonal Reaction Theory's accuracy in predicting differential breakup cross sections of one-neutron halo nuclei, confirming its validity and exploring the impact of various dynamical effects.

Contribution

It extends ERT validation to differential cross sections and clarifies the effects of different interaction choices, improving understanding of halo nucleus breakup reactions.

Findings

ERT accurately predicts differential cross sections with proper operator choices.

Dynamical effects significantly influence parallel-momentum distributions.

The validity range of ERT hypotheses is clarified.

Abstract

Background: One-neutron removal reactions are used to study the single-particle structure of unstable nuclei, and in particular the exotic halo nuclei. The Eikonal Reaction Theory (ERT) has been developed by Yahiro, Ogata and Minomo in Prog. Theor. Phys. 126, 167 (2011) to include dynamical effects, which are missing in the usual eikonal description of these reactions. Encouraging results have been obtained for total breakup cross sections in comparison to more elaborate reaction models. Purpose: We extend these comparisons to more differential breakup cross sections expressed as functions of the relative energy or parallel momentum between the core and halo neutron. Method: ERT predictions of these cross sections are compared to state-of-the-art calculations. Results: The hypotheses upon which the ERT is based are confirmed and their range of validity is made clearer. The actual ordering of the evolution operators {affects ERT differential} cross sections and a specific choice leads to excellent agreement with the reference calculation. Dynamical effects in the treatment of the neutron-target interaction can be significant in the parallel-momentum observable. Conclusions: The role of the different interactions in the dynamics of breakup reactions of one-neutron halo nuclei are better understood and improvements to the ERT are suggested.