Coupling to two target-state bands in the study of the n+22Ne system at low energy

TL;DR

This paper extends the MCAS formalism to include coupling between different target-state bands, improving the modeling of neutron scattering from 22Ne by accounting for states outside the main rotational band.

Contribution

The study introduces a modified MCAS approach that allows for variable coupling strengths to multiple target-state bands, enhancing nuclear scattering analysis.

Findings

Extended MCAS enables coupling to multiple bands.

Improved modeling of neutron-22Ne scattering.

Better agreement with experimental data.

Abstract

One theoretical method for studying nuclear scattering and resonances is via the multi-channel algebraic scattering (MCAS) formalism. Studies to date with this method have used a simple collective-rotor prescription to model target states with which a nucleon couples. While generally these target states all belong to the same rotational band, for certain systems it is necessary to include coupling to states outside of that main band. Here, we extend MCAS to allow coupling of different strengths between such states and the rotor band. This is an essential consideration in studying the example examined herein, the scattering of neutrons from 22Ne.