Evidence of Oscillating Neutron-Capture Cross Sections

Area of Science:

• Nuclear Physics
• Quantum Mechanics
• Statistical Physics

Background:

• Neutron-capture cross sections are crucial for understanding nuclear reactions.
• Current nuclear models often assume random fluctuations in these cross sections, based on random matrix theory (RMT).

Purpose of the Study:

• To investigate the nature of fluctuations in neutron-capture cross sections.
• To determine if these fluctuations align with predictions from random matrix theory (RMT).

Main Methods:

• Analysis of neutron-capture cross section data within the resolved resonance range.
• Statistical analysis to identify and quantify oscillations and their significance.

Main Results:

• A significant fraction (62%) of analyzed neutron-capture cross sections exhibit highly significant oscillations (>99.9% confidence).
• In 43% of cases, these oscillations exceed a 5σ significance level.
• Oscillations constitute approximately 10.86% of the average cross section, with periods from 68.2 to 2380 eV.

Conclusions:

• Observed oscillations significantly deviate from RMT predictions, which expect purely random fluctuations.
• These widespread deviations indicate a common physical mechanism not accounted for in current nuclear physics models.
• The findings necessitate a revision of nuclear models to incorporate these newly identified phenomena in neutron-capture processes.