Analysis of Coulomb breakup experiments of 8B with a dynamical eikonal approximation

TL;DR

This paper analyzes Coulomb breakup experiments of 8B using a dynamical eikonal approximation, showing good agreement with data and highlighting the impact of higher-order effects on astrophysical S factor extraction.

Contribution

It demonstrates that a simple 7Be-p potential model suffices to describe all observables in Coulomb breakup of 8B within the dynamical eikonal framework.

Findings

Good agreement with experimental observables between 40 and 80 MeV per nucleon

Asymmetry in momentum distributions is well reproduced without scaling

Higher-order effects significantly influence the analysis of astrophysical S factors

Abstract

Various measurements of the Coulomb breakup of 8B are analyzed within the dynamical eikonal approximation using a single description of 8B. We obtain a good agreement with experiment for different observables measured between 40 and 80 MeV per nucleon. A simple 7Be-p potential model description of 8B seems sufficient to describe all observables. In particular, the asymmetry in parallel-momentum distributions due to E1-E2 interferences is well reproduced without any scaling. The projectile-target nuclear interactions seem negligible if data are selected at forward angles. On the contrary, like in previous analyzes we observe a significant influence of higher-order effects. The accuracy of astrophysical S factors for the 7Be(p,gamma)8B reaction at stellar energies extracted from breakup measurements therefore seems difficult to evaluate.