Calculation of the Thermal Neutron Scattering Cross-Section of Solids Using OCLIMAX.

Area of Science:

• Nuclear Engineering
• Condensed Matter Physics
• Computational Physics

Background:

• The energy dependence of thermal neutron scattering cross-sections in solids is crucial for nuclear applications.
• Existing methods, like the LEAPR module in NJOY code, involve approximations that limit accuracy.
• Calculating this dependence from first principles without approximations is a significant challenge.

Purpose of the Study:

• To demonstrate a novel calculation method for the energy-dependent thermal neutron scattering cross-section of solids.
• To present the OCLIMAX program as a tool for first-principles calculations.
• To overcome limitations of existing scattering theory approximations.

Main Methods:

• Utilizing the OCLIMAX program for first-principles calculations of neutron scattering cross-sections.
• Eliminating approximations inherent in standard methods like the LEAPR module of NJOY code.
• Comparing OCLIMAX results with experimental and theoretical data.

Main Results:

• OCLIMAX successfully calculates the energy dependence of the thermal neutron scattering cross-section.
• The method presented overcomes limitations of previous approaches.
• Calculated results show good agreement with existing experimental and theoretical data.
• The full dynamical structure factor provides additional insights.

Conclusions:

• OCLIMAX provides a powerful platform for accurate neutron scattering cross-section calculations.
• The method has significant potential for advancing the study of neutron thermalization in solids.
• This work paves the way for improved material analysis in various nuclear applications.