Spectroscopy of the unbound: One-neutron knockout reaction of $^{14}$Be

TL;DR

This study uses advanced Faddeev calculations to analyze one-neutron knockout reactions of $^{14}$Be, revealing the importance of multiple scattering effects and the angular momentum of the valence neutron.

Contribution

It provides a comprehensive Faddeev-based analysis of the reaction, highlighting the inadequacy of simpler models and the significance of multiple scattering contributions.

Findings

Proton-core single scattering contribution is significant.

Distorted-wave impulse approximation is insufficient.

Semi-inclusive cross section indicates valence neutron's angular momentum.

Abstract

Full Faddeev-type calculations are performed for one-neutron knockout reaction of $^{14}$Be on proton target at 69 MeV/u incident energy. Inclusive transverse momentum distributions for the outgoing ($^{12}$Be + n) system and semi-inclusive cross sections are presented. A significant proton-core single scattering contribution emerges where the valence neutron has non zero angular momentum relative to the core. This indicates that distorted-wave impulse approximation is inadequate and the complete multiple scattering series must be taken into account for the considered reaction. The magnitude of the semi-inclusive cross section at quasifree scattering conditions is a clear signature of the angular momentum of the valence nucleon.