Self-consistent microscopic description of neutron scattering by $^{16}$O based on the continuum particle-vibration coupling method

TL;DR

This paper presents a microscopic approach using the continuum particle-vibration coupling method to accurately describe neutron scattering by $^{16}$O below 30 MeV, capturing resonance fragmentation and channel-coupling effects.

Contribution

The study introduces a self-consistent microscopic framework based on the cPVC method with Skyrme interaction for neutron-$^{16}$O scattering, successfully explaining experimental cross sections.

Findings

Reproduces experimental total and elastic cross sections well.

Shows fragmentation and energy shift of single-particle resonances.

Explains about 85% of the reaction cross section through channel coupling.

Abstract

The microscopic description of neutron scattering by $^{16}$O below 30 MeV is carried out by means of the continuum particle-vibration coupling (cPVC) method with the Skyrme nucleon-nucleon ($NN$) effective interaction. In the cPVC method, a proper boundary condition on a nucleon in continuum states is imposed, which enables one to evaluate the transition matrix in a straightforward manner. Experimental data of the total and total-elastic cross sections are reproduced quite well by the cPVC method. An important feature of the result is the fragmentation of the single-particle resonance into many peaks as well as the shift of its centroid energy. Thus, some part of the fine structure of the experimental cross sections at lower energies is well described by the cPVC framework. The cPVC method based on a real $NN$ effective interaction is found to successfully explain about 85% of the reaction cross section, through explicit channel-coupling effects.