Sunday 09 March 2025
Physicists have long sought to understand the intricacies of neutron-neutron interactions, a fundamental aspect of nuclear physics. Recently, scientists at Tsinghua University in China made significant strides in this pursuit by measuring the strength of these interactions and exploring their spatial-temporal dynamics.
To achieve this feat, researchers employed the Lednick´y-Lyuboshitz approach, which involves analyzing two-particle correlation functions to extract valuable information about the interaction. This method was first proposed by Radoslav Lednick´y and Vladimir Lyuboshitz in the 1980s and has since been refined to accommodate various particle pairs.
In this study, scientists measured the neutron-neutron correlation function in 25 MeV/u 124Sn+124Sn collisions using the CSHINE detector. By examining the resulting data, researchers were able to extract the scattering length (fnn0) and effective range (dnn0) of the neutron-neutron interaction, as well as the reduced space-time size (R(0)) of the neutron emission source.
The results show that the measured scattering length is consistent with previous experiments, providing further validation for the Lednick´y-Lyuboshitz approach. Moreover, the extracted values for fnn0 and dnn0 offer a more precise understanding of the neutron-neutron interaction, which can have significant implications for our comprehension of nuclear force.
The discovery also sheds light on the spatial-temporal dynamics of neutron emission. By examining momentum-gated correlation functions, researchers found that the space-time ambiguity is significantly smaller in high-momentum gated data compared to low-momentum gated data. This phenomenon suggests that neutrons emitted during the early stages of the reaction experience a shorter distance between each other, whereas those emitted later in the reaction have a larger separation.
These findings not only deepen our understanding of neutron-neutron interactions but also provide insight into the isospin dynamics in heavy-ion reactions. The results demonstrate the potential for fine-scale femtoscopic techniques to be employed in future experiments, enabling researchers to further probe the intricacies of nuclear physics.
The significance of this study lies not only in its technical achievements but also in its potential applications. By refining our understanding of neutron-neutron interactions, scientists can better comprehend the underlying forces that govern the behavior of subatomic particles. This knowledge can, in turn, inform the development of new technologies and treatments, such as advanced radiation therapy for cancer patients.
Cite this article: “Unraveling Neutron-Neutron Interactions: A Breakthrough in Nuclear Physics”, The Science Archive, 2025.
Neutron-Neutron Interactions, Nuclear Physics, Tsinghua University, Lednick´Y-Lyuboshitz Approach, Two-Particle Correlation Functions, Scattering Length, Effective Range, Reduced Space-Time Size, Femtoscopic Techniques, Isosp
