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Home Science News Chemistry

New insights on the role of nucleon exchange in nuclear fusion

June 10, 2024
in Chemistry
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The Science

Low-energy nuclear fusion reactions can potentially provide clean energy. In stars, low-energy fusion reactions during the stages of carbon and oxygen burning are critical to stellar evolution. These reactions also offer valuable insights into the exotic processes occurring in the inner crust of neutron stars as they accumulate matter. However, scientists do not fully understand the underlying dynamics governing these reactions. The key to unlocking the fusion process is understanding how nucleons move between the two fusing nuclei. As the nuclei draw close enough for the nuclear forces to become effective, neutrons and protons can migrate from one nucleus to another. This movement potentially eases the fusion process.

The Impact

This study explored the influence on low-energy fusion processes of isospin composition. This is a key nuclear property that differentiates protons from neutrons. The researchers used computational techniques and theoretical modeling to investigate the fusion of different nuclei with varying isospin configurations. The results show that the isospin composition of the nuclei in a fusion reaction plays a crucial role in understanding the reaction. The findings provide insights into the processes that govern low-energy fusion reactions. This could enhance scientific research on astrophysical processes such as nucleosynthesis, which is critical to our understanding of the universe as a whole.

Summary

In this study, researchers at Fisk University and Vanderbilt University used high-performance computational and theoretical modeling techniques to conduct a detailed many-body method study of how the dynamics of isospin influence nuclear fusion at low energies across a series of isotopes. The study also examined how the shape of the nuclei involved affect these dynamics. In systems where the nuclei are not symmetrical, the dynamics of isospin become particularly important, often leading to a lowered fusion barrier, especially in systems rich in neutrons. This phenomenon can be explored using facilities that specialize in the generation of beams composed of exotic, unstable nuclei.

The findings provide critical knowledge regarding the fundamental nuclear processes governing these reactions, which have broad implications for fields such as nuclear physics, astrophysics, and, perhaps someday, fusion-based energy.



Funding

This research was supported by the Department of Energy Office of Science, Office of Nuclear Physics.

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