Work

Modeling direct and pre-equilibrium processes of neutron-induced reactions with the noniterative finite amplitude method and with the distorted-wave Born approximation

Year: 2025

Type: article

Abstract: This work develops a fully microscopic framework for neutron-induced reactions to describe direct and one-step pre-equilibrium processes. The authors combine the noniterative finite-amplitude method (FAM) with the distorted-wave Born approximation (DWBA). The resulting FAM-QRPA+DWBA formalism employs the Skyrme effective interaction to derive quasiparticle random-phase approximation (QRPA) equations, which leads to a consistent and parameter-free treatment of neutron inelastic scattering to both discrete and continuum states. Applied to the ${}^{208}$Pb($n$,$n\ensuremath{'}$) reaction, the method accurately reproduces measured differential and double-differential cross sections across 7--25 MeV without empirical adjustments. The calculated spin distributions of residual nuclei agree with combinatorial 1p--1h systematics, demonstrating that the noniterative FAM-QRPA+DWBA approach provides an efficient and predictive tool for modeling neutron-induced reactions within a unified microscopic framework.

Source: Physical Review C

DOI: 10.1103/jjd9-9hrs

Authors: Hirokazu Sasaki, Toshihiko Kawano, Marc Dupuis

Institutions: Los Alamos National Laboratory, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, CEA DAM Île-de-France, Laboratoire Matière en Conditions Extrêmes

Language: English

Topic: Nuclear physics research studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: U.S. Department of Energy, National Nuclear Security Administration, Office of Defense Nuclear Nonproliferation, Los Alamos National Laboratory

Awards: G1017065088, G1279347439, G2028332453, G6410514744, G6563880843