The use of multiple-scattering data to enhance small-angle neutron scattering experiments

Area of Science:

• Materials Science
• Neutron Physics
• Scattering Techniques

Background:

• Small-angle neutron scattering (SANS) probes microstructures.
• Multiple scattering events complicate SANS data interpretation.
• Understanding scattering contributions is crucial for accurate material characterization.

Purpose of the Study:

• To develop a method for extracting quantitative information from multiple neutron scattering.
• To determine object shape and contrast using SANS data.
• To introduce a generalized profile function for broader applicability.

Main Methods:

• Classifying scattered neutrons by the number of scattering events (n).
• Collecting SANS data as a function of specimen thickness and neutron wavelength.
• Simultaneously analyzing multiple scattering profiles.
• Introducing a generalized profile function for data fitting.

Main Results:

• Demonstrated that multiple scattering analysis yields absolute cross-section values for scattering and removal.
• Showed that the scattering cross-section is wavelength-independent only for single scattering (n=1).
• Validated a profile function that approximates literature data.

Conclusions:

• Multiple scattering analysis enhances the quantitative capabilities of SANS.
• This approach provides absolute contrast and shape information.
• The method is applicable to time-of-flight SANS experiments.